Merge branch '4.4-armlt-hdlcd' into 4.4-armlt

# Conflicts:
#	arch/arm64/boot/dts/arm/juno-base.dtsi
#	linaro/configs/vexpress64.conf

23 files changed, 2836 insertions, 11 deletions

diff --git a/Documentation/devicetree/bindings/video/arm,hdlcd.txt b/Documentation/devicetree/bindings/video/arm,hdlcd.txt
new file mode 100644
index 000000000000..51795ce7dff1
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/arm,hdlcd.txt
@@ -0,0 +1,115 @@
+ARM HDLCD
+
+This is a driver for a display controller found on several development
+platforms produced by ARM Ltd and in more modern of its' Fast Models.
+The HDLCD is an RGB streamer that reads the data from a framebuffer
+and sends it to a single digital encoder (DVI or HDMI).
+
+Required properties:
+  - compatible: "arm,hdlcd"
+  - reg: Physical base address and length of the controller's registers.
+    If a second pair of address and length values is present this specifies
+    the presence of a DMA coherent memory area that the HDLCD can use as
+    framebuffer instead of normal CMA memory.
+  - interrupts: One interrupt used by the display controller to notify the
+    interrupt controller when any of the interrupt sources programmed in
+    the interrupt mask register have activated.
+  - clocks: A list of phandle + clock-specifier pairs, one for each
+    entry in 'clock-names'.
+  - clock-names: A list of clock names. For HDLD it should contain:
+      - "pxlclk" for the clock feeding the output PLL of the controller.
+
+Optional nodes:
+  - port: The HDLCD connection to an encoder chip. The connection is modeled
+    using the OF graph bindings specified in Documentation/devicetree/bindings/graph.txt.
+    If no port node is specified then the driver will assume that it is
+    running an emulated device.
+  - display-timings: If the HDLCD is emulated by the Fast Model, place the
+    videomode(s) of the desired resolution(s) here. If multiple videomodes
+    are being used, a 'native-mode' property should be used to indicate the
+    preferred/default resolution. Refer to
+    Documentation/devicetree/bindings/video/display-timing.txt for details.
+
+
+Example:
+
+/ {
+	...
+
+	/* Emulated device */
+	hdlcd@7ff60000 {
+		compatible = "arm,hdlcd";
+		reg = <0 0x7ff60000 0 0x1000>;
+		interrupts = <GIC_SPI 35 IRQ_TYPE_LEVEL_HIGH>;
+
+		display-timings {
+			native-mode = <&timing0>;
+			timing0: timing@0 {
+				/* 1024 x 768 framebufer, standard VGA timings */
+				clock-frequency = <65000>;
+				hactive = <1024>;
+				vactive = <768>;
+				hfront-porch = <24>;
+				hback-porch = <160>;
+				hsync-len = <136>;
+				vfront-porch = <3>;
+				vback-porch = <29>;
+				vsync-len = <6>;
+			};
+		};
+	};
+
+	/* Physical device */
+	hdlcd@2b000000 {
+		compatible = "arm,hdlcd";
+		reg = <0 0x2b000000 0 0x1000>;
+		interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&oscclk5>;
+		clock-names = "pxlclk";
+		port {
+			hdlcd_output: endpoint@0 {
+				remote-endpoint = <&tda998x_1_input>;
+			};
+		};
+	};
+
+	/* HDMI I2C bus */
+	i2c@7ffa0000 {
+		compatible = "snps,designware-i2c";
+		reg = <0x0 0x7ffa0000 0x0 0x1000>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		interrupts = <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>;
+		clock-frequency = <400000>;
+		i2c-sda-hold-time-ns = <500>;
+		clocks = <&soc_smc50mhz>;
+
+		hdmi-transmitter@70 {
+			compatible = "nxp,tda998x";
+			reg = <0x70>;
+			video-ports = <0x234501>;
+			port@0 {
+				tda998x_1_input: endpoint {
+					remote-endpoint = <&hdlcd_output>;
+				};
+
+				tda998x_1_output: endpoint {
+					remote-endpoint = <&hdmi_1_port>;
+				};
+			};
+		};
+
+	};
+
+	hdmi1: connector@1 {
+		compatible = "hdmi-connector";
+		type = "a";
+		port {
+			hdmi_1_port: endpoint {
+				remote-endpoint = <&tda998x_1_output>;
+			};
+		};
+	};
+
+	...
+};
diff --git a/arch/arm/boot/dts/vexpress-v2m-rs1.dtsi b/arch/arm/boot/dts/vexpress-v2m-rs1.dtsi
index 21b02874bea3..f55784037021 100644
--- a/arch/arm/boot/dts/vexpress-v2m-rs1.dtsi
+++ b/arch/arm/boot/dts/vexpress-v2m-rs1.dtsi
@@ -222,6 +222,9 @@
 				dvi-transmitter@39 {
 					compatible = "sil,sii9022-tpi", "sil,sii9022";
 					reg = <0x39>;
+
+					v2m_dvi_port: port {
+					};
 				};
 
 				dvi-transmitter@60 {
@@ -245,7 +248,7 @@
 				reg-shift = <2>;
 			};
 
-			clcd@1f0000 {
+			v2m_clcd: clcd@1f0000 {
 				compatible = "arm,pl111", "arm,primecell";
 				reg = <0x1f0000 0x1000>;
 				interrupt-names = "combined";
diff --git a/arch/arm/boot/dts/vexpress-v2p-ca15-tc1.dts b/arch/arm/boot/dts/vexpress-v2p-ca15-tc1.dts
index 9420053acc14..d4331294741b 100644
--- a/arch/arm/boot/dts/vexpress-v2p-ca15-tc1.dts
+++ b/arch/arm/boot/dts/vexpress-v2p-ca15-tc1.dts
@@ -57,6 +57,22 @@
 		interrupts = <0 85 4>;
 		clocks = <&oscclk5>;
 		clock-names = "pxlclk";
+
+		port {
+			hdlcd0_output: endpoint@0 {
+				remote-endpoint = <&sii9022_0_input>;
+			};
+		};
+	};
+
+	hdmi0: connector@0 {
+		compatible = "hdmi-connector";
+		type = "a";
+		port {
+			hdmi0_connector_output: endpoint {
+				remote-endpoint = <&sii9022_0_output>;
+			};
+		};
 	};
 
 	memory-controller@2b0a0000 {
@@ -281,3 +297,17 @@
 		/include/ "vexpress-v2m-rs1.dtsi"
 	};
 };
+
+&v2m_clcd {
+	status = "disabled";
+};
+
+&v2m_dvi_port {
+	sii9022_0_input: endpoint@0 {
+		remote-endpoint = <&hdlcd0_output>;
+	};
+
+	sii9022_0_output: endpoint@1 {
+		remote-endpoint = <&hdmi0_connector_output>;
+	};
+};
diff --git a/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts b/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts
index 17f63f7dfd9e..c2ba4d10e41f 100644
--- a/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts
+++ b/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts
@@ -111,6 +111,22 @@
 		interrupts = <0 85 4>;
 		clocks = <&oscclk5>;
 		clock-names = "pxlclk";
+
+		port {
+			hdlcd0_output: endpoint@0 {
+				remote-endpoint = <&sii9022_0_input>;
+			};
+		};
+	};
+
+	hdmi0: connector@0 {
+		compatible = "hdmi-connector";
+		type = "a";
+		port {
+			hdmi0_connector_output: endpoint {
+				remote-endpoint = <&sii9022_0_output>;
+			};
+		};
 	};
 
 	memory-controller@2b0a0000 {
@@ -639,3 +655,17 @@
 		/include/ "vexpress-v2m-rs1.dtsi"
 	};
 };
+
+&v2m_clcd {
+	status = "disabled";
+};
+
+&v2m_dvi_port {
+	sii9022_0_input: endpoint@0 {
+		remote-endpoint = <&hdlcd0_output>;
+	};
+
+	sii9022_0_output: endpoint@1 {
+		remote-endpoint = <&hdmi0_connector_output>;
+	};
+};
diff --git a/arch/arm/boot/dts/vexpress-v2p-ca5s.dts b/arch/arm/boot/dts/vexpress-v2p-ca5s.dts
index d2709b73316b..83815ee3dda5 100644
--- a/arch/arm/boot/dts/vexpress-v2p-ca5s.dts
+++ b/arch/arm/boot/dts/vexpress-v2p-ca5s.dts
@@ -59,6 +59,22 @@
 		interrupts = <0 85 4>;
 		clocks = <&oscclk3>;
 		clock-names = "pxlclk";
+
+		port {
+			hdlcd0_output: endpoint@0 {
+				remote-endpoint = <&sii9022_0_input>;
+			};
+		};
+	};
+
+	hdmi0: connector@0 {
+		compatible = "hdmi-connector";
+		type = "a";
+		port {
+			hdmi0_connector_output: endpoint {
+				remote-endpoint = <&sii9022_0_output>;
+			};
+		};
 	};
 
 	memory-controller@2a150000 {
@@ -251,3 +267,17 @@
 		/include/ "vexpress-v2m-rs1.dtsi"
 	};
 };
+
+&v2m_clcd {
+	status = "disabled";
+};
+
+&v2m_dvi_port {
+	sii9022_0_input: endpoint@0 {
+		remote-endpoint = <&hdlcd0_output>;
+	};
+
+	sii9022_0_output: endpoint@1 {
+		remote-endpoint = <&hdmi0_connector_output>;
+	};
+};
diff --git a/arch/arm64/boot/dts/arm/juno-base.dtsi b/arch/arm64/boot/dts/arm/juno-base.dtsi
index 077624ebf708..db4fd5e494c1 100644
--- a/arch/arm64/boot/dts/arm/juno-base.dtsi
+++ b/arch/arm64/boot/dts/arm/juno-base.dtsi
@@ -114,8 +114,8 @@
 			scpi_clk: scpi-clk {
 				compatible = "arm,scpi-variable-clocks";
 				#clock-cells = <1>;
-				clock-indices = <3>;
-				clock-output-names = "pxlclk";
+				clock-indices = <3>, <4>, <5>;
+				clock-output-names = "pxlclk", "pxlclk1", "i2sclk";
 			};
 		};
 
@@ -195,7 +195,7 @@
 
 	/include/ "juno-clocks.dtsi"
 
-	dma@7ff00000 {
+	dma0: dma@7ff00000 {
 		compatible = "arm,pl330", "arm,primecell";
 		reg = <0x0 0x7ff00000 0 0x1000>;
 		#dma-cells = <1>;
@@ -213,7 +213,7 @@
 		clocks = <&soc_faxiclk>;
 		clock-names = "apb_pclk";
 	};
-
+/*
 	hdlcd@7ff50000 {
 		compatible = "arm,hdlcd";
 		reg = <0 0x7ff50000 0 0x1000>;
@@ -227,7 +227,7 @@
 			};
 		};
 	};
-
+*/
 	hdlcd@7ff60000 {
 		compatible = "arm,hdlcd";
 		reg = <0 0x7ff60000 0 0x1000>;
@@ -256,13 +256,16 @@
 		#address-cells = <1>;
 		#size-cells = <0>;
 		interrupts = <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>;
-		clock-frequency = <400000>;
+		clock-frequency = <100000>;
 		i2c-sda-hold-time-ns = <500>;
 		clocks = <&soc_smc50mhz>;
 
-		hdmi-transmitter@70 {
+		hdmi_transmitter0: hdmi-transmitter@70 {
 			compatible = "nxp,tda998x";
 			reg = <0x70>;
+			audio-ports = <0x03>, <0x04>;
+			audio-port-names = "i2s", "spdif";
+			#sound-dai-cells = <1>;
 			port {
 				tda998x_0_input: tda998x-0-endpoint {
 					remote-endpoint = <&hdlcd0_output>;
@@ -274,10 +277,10 @@
 			compatible = "nxp,tda998x";
 			reg = <0x71>;
 			port {
-				tda998x_1_input: tda998x-1-endpoint {
+/*				tda998x_1_input: tda998x-1-endpoint {
 					remote-endpoint = <&hdlcd1_output>;
 				};
-			};
+*/			};
 		};
 	};
 
@@ -323,6 +326,36 @@
 		};
 	};
 
+	soc_i2s: i2s@7ff90000 {
+		compatible = "snps,designware-i2s";
+		reg = <0x0 0x7ff90000 0x0 0x1000>;
+		clocks = <&scpi_clk 5>, <&soc_refclk100mhz>;
+		clock-names = "i2sclk", "apb_pclk";
+		#sound-dai-cells = <0>;
+		dmas = <&dma0 5>;
+		dma-names = "tx";
+	};
+
+	hdmi_audio: hdmi_audio@0 {
+		compatible = "linux,hdmi-audio";
+		#sound-dai-cells = <0>;
+		status = "okay";
+	};
+
+	sound {
+		compatible = "simple-audio-card";
+
+		simple-audio-card,format = "i2s";
+
+		simple-audio-card,cpu {
+			sound-dai = <&soc_i2s>;
+		};
+
+		simple-audio-card,codec {
+			sound-dai = <&hdmi_transmitter0 0>;
+		};
+	};
+
 	smb@08000000 {
 		compatible = "simple-bus";
 		#address-cells = <2>;
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index c4bf9a1cf4a6..3fd9124a828b 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -106,6 +106,8 @@ config DRM_TDFX
 	  Choose this option if you have a 3dfx Banshee or Voodoo3 (or later),
 	  graphics card.  If M is selected, the module will be called tdfx.
 
+source "drivers/gpu/drm/arm/Kconfig"
+
 config DRM_R128
 	tristate "ATI Rage 128"
 	depends on DRM && PCI
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 1e9ff4c3e3db..6b42d7553719 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -35,6 +35,7 @@ CFLAGS_drm_trace_points.o := -I$(src)
 
 obj-$(CONFIG_DRM)	+= drm.o
 obj-$(CONFIG_DRM_MIPI_DSI) += drm_mipi_dsi.o
+obj-$(CONFIG_DRM_ARM)	+= arm/
 obj-$(CONFIG_DRM_TTM)	+= ttm/
 obj-$(CONFIG_DRM_TDFX)	+= tdfx/
 obj-$(CONFIG_DRM_R128)	+= r128/
diff --git a/drivers/gpu/drm/arm/Kconfig b/drivers/gpu/drm/arm/Kconfig
new file mode 100644
index 000000000000..8de5b511a963
--- /dev/null
+++ b/drivers/gpu/drm/arm/Kconfig
@@ -0,0 +1,26 @@
+config DRM_ARM
+	bool "ARM Ltd. drivers"
+	depends on DRM && OF && (ARM || ARM64)
+	select DMA_CMA
+	select DRM_KMS_HELPER
+	select DRM_KMS_CMA_HELPER
+	select DRM_GEM_CMA_HELPER
+	select VIDEOMODE_HELPERS
+	help
+	  Choose this option to select drivers for ARM's devices
+
+config DRM_HDLCD
+	tristate "ARM HDLCD"
+	depends on DRM_ARM
+	select I2C
+	help
+	  Choose this option if you have an ARM High Definition Colour LCD
+	  controller.
+
+	  If M is selected the module will be called hdlcd.
+
+config DRM_VIRTUAL_HDLCD
+       bool "Support for virtual HDLCD"
+       depends on DRM_HDLCD
+       help
+         Enable support for virtual HDLCD as emulated by ARM's Fast Models.
diff --git a/drivers/gpu/drm/arm/Makefile b/drivers/gpu/drm/arm/Makefile
new file mode 100644
index 000000000000..9a96f9b6340d
--- /dev/null
+++ b/drivers/gpu/drm/arm/Makefile
@@ -0,0 +1,4 @@
+
+hdlcd-y := hdlcd_drv.o hdlcd_crtc.o hdlcd_vexpress_encoder.o hdlcd_fb_helper.o
+hdlcd-$(CONFIG_DRM_VIRTUAL_HDLCD) += hdlcd_virt_encoder.o
+obj-$(CONFIG_DRM_HDLCD)	+= hdlcd.o
diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c
new file mode 100644
index 000000000000..aa435cb06a21
--- /dev/null
+++ b/drivers/gpu/drm/arm/hdlcd_crtc.c
@@ -0,0 +1,301 @@
+/*
+ * Copyright (C) 2013-2015 ARM Limited
+ * Author: Liviu Dudau <Liviu.Dudau@arm.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ *
+ *  Implementation of a CRTC class for the HDLCD driver.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_helper.h>
+#include "hdlcd_fb_helper.h"
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_of.h>
+#include <drm/drm_plane_helper.h>
+#include <linux/clk.h>
+#include <linux/of_graph.h>
+#include <linux/platform_data/simplefb.h>
+
+#include "hdlcd_drv.h"
+#include "hdlcd_regs.h"
+
+/*
+ * The HDLCD controller is a dumb RGB streamer that gets connected to
+ * a single HDMI transmitter or in the case of the ARM Models it gets
+ * emulated by the software that does the actual rendering.
+ *
+ */
+static void hdlcd_crtc_destroy(struct drm_crtc *crtc)
+{
+	struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
+
+	of_node_put(hdlcd->crtc.port);
+	drm_crtc_cleanup(crtc);
+}
+
+void hdlcd_set_scanout(struct hdlcd_drm_private *hdlcd, bool wait)
+{
+	struct drm_framebuffer *fb = hdlcd->crtc.primary->fb;
+	struct drm_gem_cma_object *gem;
+	unsigned int depth, bpp;
+	dma_addr_t scanout_start;
+
+	drm_fb_get_bpp_depth(fb->pixel_format, &depth, &bpp);
+	gem = hdlcd_fb_get_gem_obj(fb, 0);
+
+	scanout_start = gem->paddr + fb->offsets[0] +
+		(hdlcd->crtc.y * fb->pitches[0]) + (hdlcd->crtc.x * bpp/8);
+
+	hdlcd_write(hdlcd, HDLCD_REG_FB_BASE, scanout_start);
+
+	if (wait && hdlcd->dpms == DRM_MODE_DPMS_ON) {
+		drm_vblank_get(fb->dev, 0);
+		/* Clear any interrupt that may be from before we changed scanout */
+		hdlcd_write(hdlcd, HDLCD_REG_INT_CLEAR, HDLCD_INTERRUPT_DMA_END);
+		/* Wait for next interrupt so we know scanout change is live */
+		reinit_completion(&hdlcd->frame_completion);
+		wait_for_completion_interruptible(&hdlcd->frame_completion);
+
+		drm_vblank_put(fb->dev, 0);
+	}
+}
+
+static int hdlcd_crtc_page_flip(struct drm_crtc *crtc,
+			struct drm_framebuffer *fb,
+			struct drm_pending_vblank_event *event,
+			uint32_t flags)
+{
+	struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
+
+	if (hdlcd->dpms == DRM_MODE_DPMS_ON) {
+		/* don't schedule any page flipping if one is in progress */
+		if (hdlcd->event)
+			return -EBUSY;
+
+		hdlcd->event = event;
+		drm_vblank_get(crtc->dev, 0);
+	}
+
+	crtc->primary->fb = fb;
+
+	if (hdlcd->dpms == DRM_MODE_DPMS_ON) {
+		hdlcd_set_scanout(hdlcd, true);
+	} else {
+		unsigned long flags;
+
+		/* not active, update registers immediately */
+		hdlcd_set_scanout(hdlcd, false);
+		spin_lock_irqsave(&crtc->dev->event_lock, flags);
+		if (event)
+			drm_send_vblank_event(crtc->dev, 0, event);
+		spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
+	}
+
+	return 0;
+}
+
+static const struct drm_crtc_funcs hdlcd_crtc_funcs = {
+	.destroy	= hdlcd_crtc_destroy,
+	.set_config	= drm_crtc_helper_set_config,
+	.page_flip	= hdlcd_crtc_page_flip,
+};
+
+static void hdlcd_crtc_dpms(struct drm_crtc *crtc, int mode)
+{
+	struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
+
+	hdlcd->dpms = mode;
+	if (mode == DRM_MODE_DPMS_ON)
+		hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 1);
+	else
+		hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 0);
+}
+
+static bool hdlcd_crtc_mode_fixup(struct drm_crtc *crtc,
+			const struct drm_display_mode *mode,
+			struct drm_display_mode *adjusted_mode)
+{
+	return true;
+}
+
+static void hdlcd_crtc_prepare(struct drm_crtc *crtc)
+{
+	hdlcd_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
+}
+
+static void hdlcd_crtc_commit(struct drm_crtc *crtc)
+{
+	drm_vblank_post_modeset(crtc->dev, 0);
+	hdlcd_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
+}
+
+static struct simplefb_format supported_formats[] = SIMPLEFB_FORMATS;
+
+static int hdlcd_crtc_colour_set(struct hdlcd_drm_private *hdlcd,
+				uint32_t pixel_format)
+{
+	unsigned int depth, bpp;
+	unsigned int default_color = 0x00000000;
+	struct simplefb_format *format = NULL;
+	int i;
+
+#ifdef HDLCD_SHOW_UNDERRUN
+	default_color = 0x00ff0000;	/* show underruns in red */
+#endif
+
+	/* Calculate each colour's number of bits */
+	drm_fb_get_bpp_depth(pixel_format, &depth, &bpp);
+
+	for (i = 0; i < ARRAY_SIZE(supported_formats); i++) {
+		if (supported_formats[i].fourcc == pixel_format)
+			format = &supported_formats[i];
+	}
+
+	if (!format) {
+		DRM_ERROR("Format not supported: 0x%x\n", pixel_format);
+		return -EINVAL;
+	}
+
+	/* HDLCD uses 'bytes per pixel' */
+	bpp = (bpp + 7) / 8;
+	hdlcd_write(hdlcd, HDLCD_REG_PIXEL_FORMAT, (bpp - 1) << 3);
+
+	/*
+	 * The format of the HDLCD_REG_<color>_SELECT register is:
+	 *   - bits[23:16] - default value for that color component
+	 *   - bits[11:8]  - number of bits to extract for each color component
+	 *   - bits[4:0]   - index of the lowest bit to extract
+	 *
+	 * The default color value is used when bits[11:8] read zero, when the
+	 * pixel is outside the visible frame area or when there is a
+	 * buffer underrun.
+	 */
+	if(!config_enabled(CONFIG_ARM)) {
+		hdlcd_write(hdlcd, HDLCD_REG_RED_SELECT, default_color |
+			format->red.offset | (format->red.length & 0xf) << 8);
+		hdlcd_write(hdlcd, HDLCD_REG_GREEN_SELECT, default_color |
+			format->green.offset | (format->green.length & 0xf) << 8);
+		hdlcd_write(hdlcd, HDLCD_REG_BLUE_SELECT, default_color |
+			format->blue.offset | (format->blue.length & 0xf) << 8);
+	} else {
+		/*
+		 * This is a hack to swap read and blue when building for
+		 * 32-bit ARM, because Versatile Express motherboard seems
+		 * to be wired up differently.
+		 */
+		hdlcd_write(hdlcd, HDLCD_REG_BLUE_SELECT, default_color |
+			format->red.offset | (format->red.length & 0xf) << 8);
+		hdlcd_write(hdlcd, HDLCD_REG_GREEN_SELECT, default_color |
+			format->green.offset | (format->green.length & 0xf) << 8);
+		hdlcd_write(hdlcd, HDLCD_REG_RED_SELECT, default_color |
+			format->blue.offset | (format->blue.length & 0xf) << 8);
+	}
+	return 0;
+}
+
+static int hdlcd_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
+	struct drm_framebuffer *old_fb)
+{
+	struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
+	hdlcd_set_scanout(hdlcd, true);
+	return 0;
+}
+
+
+static int hdlcd_crtc_mode_set(struct drm_crtc *crtc,
+			struct drm_display_mode *mode,
+			struct drm_display_mode *adjusted_mode,
+			int x, int y, struct drm_framebuffer *oldfb)
+{
+	struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc);
+	unsigned int depth, bpp, polarities, line_length, err;
+
+	drm_vblank_pre_modeset(crtc->dev, 0);
+
+	polarities = HDLCD_POLARITY_DATAEN | HDLCD_POLARITY_DATA;
+
+	if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
+		polarities |= HDLCD_POLARITY_HSYNC;
+	if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
+		polarities |= HDLCD_POLARITY_VSYNC;
+
+	drm_fb_get_bpp_depth(crtc->primary->fb->pixel_format, &depth, &bpp);
+	/* switch to the more useful 'bytes per pixel' HDLCD needs */
+	bpp = (bpp + 7) / 8;
+	line_length = crtc->primary->fb->width * bpp;
+
+	/* Allow max number of outstanding requests and largest burst size */
+	hdlcd_write(hdlcd, HDLCD_REG_BUS_OPTIONS,
+		    HDLCD_BUS_MAX_OUTSTAND | HDLCD_BUS_BURST_16);
+
+	hdlcd_write(hdlcd, HDLCD_REG_FB_LINE_LENGTH, line_length);
+	hdlcd_write(hdlcd, HDLCD_REG_FB_LINE_COUNT,
+				crtc->primary->fb->height - 1);
+	hdlcd_write(hdlcd, HDLCD_REG_FB_LINE_PITCH, line_length);
+	hdlcd_write(hdlcd, HDLCD_REG_V_BACK_PORCH,
+				mode->vtotal - mode->vsync_end - 1);
+	hdlcd_write(hdlcd, HDLCD_REG_V_FRONT_PORCH,
+				mode->vsync_start - mode->vdisplay - 1);
+	hdlcd_write(hdlcd, HDLCD_REG_V_SYNC,
+				mode->vsync_end - mode->vsync_start - 1);
+	hdlcd_write(hdlcd, HDLCD_REG_V_DATA, mode->vdisplay - 1);
+	hdlcd_write(hdlcd, HDLCD_REG_H_BACK_PORCH,
+				mode->htotal - mode->hsync_end - 1);
+	hdlcd_write(hdlcd, HDLCD_REG_H_FRONT_PORCH,
+				mode->hsync_start - mode->hdisplay - 1);
+	hdlcd_write(hdlcd, HDLCD_REG_H_SYNC,
+				mode->hsync_end - mode->hsync_start - 1);
+	hdlcd_write(hdlcd, HDLCD_REG_H_DATA, mode->hdisplay - 1);
+	hdlcd_write(hdlcd, HDLCD_REG_POLARITIES, polarities);
+
+	err = hdlcd_crtc_colour_set(hdlcd, crtc->primary->fb->pixel_format);
+	if (err)
+		return err;
+
+	clk_prepare(hdlcd->clk);
+	clk_set_rate(hdlcd->clk, mode->crtc_clock * 1000);
+	clk_enable(hdlcd->clk);
+
+	hdlcd_set_scanout(hdlcd, false);
+
+	return 0;
+}
+
+static void hdlcd_crtc_load_lut(struct drm_crtc *crtc)
+{
+}
+
+static const struct drm_crtc_helper_funcs hdlcd_crtc_helper_funcs = {
+	.dpms		= hdlcd_crtc_dpms,
+	.mode_fixup	= hdlcd_crtc_mode_fixup,
+	.prepare	= hdlcd_crtc_prepare,
+	.commit		= hdlcd_crtc_commit,
+	.mode_set	= hdlcd_crtc_mode_set,
+	.mode_set_base	= hdlcd_crtc_mode_set_base,
+	.load_lut	= hdlcd_crtc_load_lut,
+};
+
+int hdlcd_setup_crtc(struct drm_device *dev)
+{
+	struct hdlcd_drm_private *hdlcd = dev->dev_private;
+	int ret;
+
+	hdlcd->crtc.port = of_graph_get_next_endpoint(dev->platformdev->dev.of_node, NULL);
+	if (!hdlcd->crtc.port)
+		return -ENXIO;
+
+	ret = drm_crtc_init(dev, &hdlcd->crtc, &hdlcd_crtc_funcs);
+	if (ret < 0) {
+		of_node_put(hdlcd->crtc.port);
+		return ret;
+	}
+
+	drm_crtc_helper_add(&hdlcd->crtc, &hdlcd_crtc_helper_funcs);
+	return 0;
+}
+
diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
new file mode 100644
index 000000000000..dbdda01d69d0
--- /dev/null
+++ b/drivers/gpu/drm/arm/hdlcd_drv.c
@@ -0,0 +1,533 @@
+/*
+ * Copyright (C) 2013-2015 ARM Limited
+ * Author: Liviu Dudau <Liviu.Dudau@arm.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ *
+ *  ARM HDLCD Driver
+ */
+
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/of_graph.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_helper.h>
+#include "hdlcd_fb_helper.h"
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_of.h>
+
+#include "hdlcd_drv.h"
+#include "hdlcd_regs.h"
+
+static void hdlcd_setup_mode_config(struct drm_device *dev);
+
+static int compare_dev(struct device *dev, void *data)
+{
+	return dev->of_node == data;
+}
+
+struct drm_encoder *
+hdlcd_connector_best_encoder(struct drm_connector *connector)
+{
+	int enc_id = connector->encoder_ids[0];
+	struct drm_mode_object *obj;
+	struct drm_encoder *encoder;
+
+	if (connector->encoder)
+		return connector->encoder;
+
+	if (enc_id) {
+		obj = drm_mode_object_find(connector->dev, enc_id,
+					DRM_MODE_OBJECT_ENCODER);
+		if (obj) {
+			encoder = obj_to_encoder(obj);
+			return encoder;
+		}
+	}
+	return NULL;
+
+}
+
+static int hdlcd_unload(struct drm_device *dev)
+{
+	struct hdlcd_drm_private *hdlcd = dev->dev_private;
+
+	drm_kms_helper_poll_fini(dev);
+	if (hdlcd->fbdev)
+		hdlcd_drm_fbdev_fini(hdlcd->fbdev);
+
+	drm_vblank_cleanup(dev);
+	drm_mode_config_cleanup(dev);
+
+	drm_irq_uninstall(dev);
+
+	if (!IS_ERR(hdlcd->clk))
+		clk_put(hdlcd->clk);
+
+	dma_release_declared_memory(dev->dev);
+	platform_set_drvdata(dev->platformdev, NULL);
+	dev->dev_private = NULL;
+
+	return 0;
+}
+
+static int hdlcd_load(struct drm_device *dev, unsigned long flags)
+{
+	struct platform_device *pdev = dev->platformdev;
+	struct hdlcd_drm_private *hdlcd;
+	struct resource *res;
+	u32 version;
+	int ret;
+	struct device_node *node;
+	int preferred_bpp;
+
+	hdlcd = devm_kzalloc(dev->dev, sizeof(*hdlcd), GFP_KERNEL);
+	if (!hdlcd)
+		return -ENOMEM;
+
+#ifdef CONFIG_DEBUG_FS
+	atomic_set(&hdlcd->buffer_underrun_count, 0);
+	atomic_set(&hdlcd->bus_error_count, 0);
+	atomic_set(&hdlcd->vsync_count, 0);
+	atomic_set(&hdlcd->dma_end_count, 0);
+#endif
+	platform_set_drvdata(pdev, dev);
+	dev->dev_private = hdlcd;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	hdlcd->mmio = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(hdlcd->mmio)) {
+		DRM_ERROR("failed to map control registers area\n");
+		ret = PTR_ERR(hdlcd->mmio);
+		goto fail;
+	}
+
+	version = hdlcd_read(hdlcd, HDLCD_REG_VERSION);
+	if ((version & HDLCD_PRODUCT_MASK) != HDLCD_PRODUCT_ID) {
+		DRM_ERROR("unknown product id: 0x%x\n", version);
+		ret = -EINVAL;
+		goto fail;
+	}
+	DRM_INFO("found ARM HDLCD version r%dp%d\n",
+		(version & HDLCD_VERSION_MAJOR_MASK) >> 8,
+		version & HDLCD_VERSION_MINOR_MASK);
+
+	/* Make sure hardware is in a safe reset state */
+	hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 0);
+	hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, 0);
+	hdlcd_write(hdlcd, HDLCD_REG_INT_CLEAR,~0);
+	hdlcd_write(hdlcd, HDLCD_REG_INT_RAWSTAT, 0);
+
+	/* Get the optional coherent memory resource */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		ret = dma_declare_coherent_memory(dev->dev, res->start, res->start,
+					resource_size(res), DMA_MEMORY_MAP);
+		if ((ret & DMA_MEMORY_MAP) == 0) {
+			DRM_ERROR("failed to declare coherent device memory\n");
+			ret = -ENXIO;
+			goto fail;
+		}
+	}
+
+	hdlcd_setup_mode_config(dev);
+	ret = hdlcd_setup_crtc(dev);
+	if (ret < 0) {
+		DRM_ERROR("failed to create crtc\n");
+		goto fail;
+	}
+
+	hdlcd->clk = clk_get(dev->dev, NULL);
+	if (IS_ERR(hdlcd->clk)) {
+		ret = PTR_ERR(hdlcd->clk);
+		goto fail;
+	}
+
+	ret = component_bind_all(dev->dev, dev);
+	if (ret) {
+		DRM_ERROR("Failed to bind all components\n");
+		goto fail;
+	}
+
+	drm_kms_helper_poll_init(dev);
+	drm_mode_config_reset(dev);
+
+	ret = drm_irq_install(dev, platform_get_irq(pdev, 0));
+	if (ret < 0) {
+		DRM_ERROR("failed to install IRQ handler\n");
+		goto fail;
+	}
+
+	dev->irq_enabled = true;
+	dev->vblank_disable_allowed = true;
+
+	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
+	if (ret < 0) {
+		DRM_ERROR("failed to initialise vblank\n");
+		goto fail;
+	}
+	
+	init_completion(&hdlcd->frame_completion);
+
+	/* Try to pick the colour depth that Android user-side is hard-coded for */
+	preferred_bpp = 16;
+	node = of_find_compatible_node(NULL,NULL,"arm,mali-midgard");
+	if (node) {
+		of_node_put(node);
+		preferred_bpp = 32; /* If Mali present, assume 32bpp */
+	}
+
+	hdlcd->fbdev = hdlcd_drm_fbdev_init(dev, preferred_bpp,
+					dev->mode_config.num_crtc,
+					dev->mode_config.num_connector);
+
+	if (IS_ERR(hdlcd->fbdev)) {
+		DRM_ERROR("failed to initialise fbdev buffer\n");
+		ret = PTR_ERR(hdlcd->fbdev);
+		hdlcd->fbdev = NULL;
+		goto fail;
+	}
+
+	return 0;
+
+fail:
+	hdlcd_unload(dev);
+
+	return ret;
+}
+
+static void hdlcd_fb_output_poll_changed(struct drm_device *dev)
+{
+	struct hdlcd_drm_private *hdlcd = dev->dev_private;
+	if (hdlcd->fbdev) {
+		hdlcd_drm_fbdev_hotplug_event(hdlcd->fbdev);
+	}
+}
+
+static const struct drm_mode_config_funcs hdlcd_mode_config_funcs = {
+	.fb_create = hdlcd_fb_create,
+	.output_poll_changed = hdlcd_fb_output_poll_changed,
+};
+
+static void hdlcd_setup_mode_config(struct drm_device *dev)
+{
+	drm_mode_config_init(dev);
+	dev->mode_config.min_width = 0;
+	dev->mode_config.min_height = 0;
+	dev->mode_config.max_width = HDLCD_MAX_XRES;
+	dev->mode_config.max_height = HDLCD_MAX_YRES;
+	dev->mode_config.funcs = &hdlcd_mode_config_funcs;
+}
+
+static void hdlcd_preclose(struct drm_device *dev, struct drm_file *file)
+{
+}
+
+static void hdlcd_lastclose(struct drm_device *dev)
+{
+	struct hdlcd_drm_private *hdlcd = dev->dev_private;
+	hdlcd_drm_fbdev_restore_mode(hdlcd->fbdev);
+}
+
+static irqreturn_t hdlcd_irq(int irq, void *arg)
+{
+	struct drm_device *dev = arg;
+	struct hdlcd_drm_private *hdlcd = dev->dev_private;
+	unsigned long irq_status;
+
+	irq_status = hdlcd_read(hdlcd, HDLCD_REG_INT_STATUS);
+
+#ifdef CONFIG_DEBUG_FS
+	if (irq_status & HDLCD_INTERRUPT_UNDERRUN) {
+		atomic_inc(&hdlcd->buffer_underrun_count);
+	}
+	if (irq_status & HDLCD_INTERRUPT_DMA_END) {
+		atomic_inc(&hdlcd->dma_end_count);
+	}
+	if (irq_status & HDLCD_INTERRUPT_BUS_ERROR) {
+		atomic_inc(&hdlcd->bus_error_count);
+	}
+	if (irq_status & HDLCD_INTERRUPT_VSYNC) {
+		atomic_inc(&hdlcd->vsync_count);
+	}
+#endif
+	if (irq_status & HDLCD_INTERRUPT_VSYNC) {
+		struct drm_pending_vblank_event *event;
+		unsigned long flags;
+
+		drm_handle_vblank(dev, 0);
+
+		spin_lock_irqsave(&dev->event_lock, flags);
+		if (hdlcd->event) {
+			event = hdlcd->event;
+			hdlcd->event = NULL;
+			drm_send_vblank_event(dev, 0, event);
+			drm_vblank_put(dev, 0);
+		}
+		spin_unlock_irqrestore(&dev->event_lock, flags);
+	}
+	if (irq_status & HDLCD_INTERRUPT_DMA_END) {
+		// send completion when reading the frame has finished
+		complete_all(&hdlcd->frame_completion);
+	}
+
+	/* acknowledge interrupt(s) */
+	hdlcd_write(hdlcd, HDLCD_REG_INT_CLEAR, irq_status);
+
+	return IRQ_HANDLED;
+}
+
+static void hdlcd_irq_preinstall(struct drm_device *dev)
+{
+	struct hdlcd_drm_private *hdlcd = dev->dev_private;
+	/* Ensure interrupts are disabled */
+	hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, 0);
+	hdlcd_write(hdlcd, HDLCD_REG_INT_CLEAR, ~0);
+}
+
+static int hdlcd_irq_postinstall(struct drm_device *dev)
+{
+	struct hdlcd_drm_private *hdlcd = dev->dev_private;
+	unsigned long irq_mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);
+
+#ifdef CONFIG_DEBUG_FS
+	/* enable debug interrupts */
+	irq_mask |= HDLCD_DEBUG_INT_MASK;
+#endif
+
+	/* enable DMA completion interrupts */
+	irq_mask |= HDLCD_INTERRUPT_DMA_END;
+	hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, irq_mask);
+
+	return 0;
+}
+
+static void hdlcd_irq_uninstall(struct drm_device *dev)
+{
+	struct hdlcd_drm_private *hdlcd = dev->dev_private;
+	/* disable all the interrupts that we might have enabled */
+	unsigned long irq_mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);
+
+#ifdef CONFIG_DEBUG_FS
+	/* disable debug interrupts */
+	irq_mask &= ~HDLCD_DEBUG_INT_MASK;
+#endif
+
+	/* disable vsync and dma interrupts */
+	irq_mask &= ~(HDLCD_INTERRUPT_VSYNC | HDLCD_INTERRUPT_DMA_END);
+
+	hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, irq_mask);
+}
+
+static int hdlcd_enable_vblank(struct drm_device *dev, unsigned int pipe)
+{
+	struct hdlcd_drm_private *hdlcd = dev->dev_private;
+	unsigned int mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);
+
+	hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, mask | HDLCD_INTERRUPT_VSYNC);
+
+	return 0;
+}
+
+static void hdlcd_disable_vblank(struct drm_device *dev, unsigned int pipe)
+{
+	struct hdlcd_drm_private *hdlcd = dev->dev_private;
+	unsigned int mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);
+
+	hdlcd_write(hdlcd, HDLCD_REG_INT_MASK, mask & ~HDLCD_INTERRUPT_VSYNC);
+}
+
+#ifdef CONFIG_DEBUG_FS
+static int hdlcd_show_underrun_count(struct seq_file *m, void *arg)
+{
+	struct drm_info_node *node = (struct drm_info_node *)m->private;
+	struct drm_device *dev = node->minor->dev;
+	struct hdlcd_drm_private *hdlcd = dev->dev_private;
+
+	seq_printf(m, "underrun : %d\n", atomic_read(&hdlcd->buffer_underrun_count));
+	seq_printf(m, "dma_end  : %d\n", atomic_read(&hdlcd->dma_end_count));
+	seq_printf(m, "bus_error: %d\n", atomic_read(&hdlcd->bus_error_count));
+	seq_printf(m, "vsync    : %d\n", atomic_read(&hdlcd->vsync_count));
+	return 0;
+}
+
+static struct drm_info_list hdlcd_debugfs_list[] = {
+	{ "interrupt_count", hdlcd_show_underrun_count, 0 },
+};
+
+static int hdlcd_debugfs_init(struct drm_minor *minor)
+{
+	return drm_debugfs_create_files(hdlcd_debugfs_list,
+		ARRAY_SIZE(hdlcd_debugfs_list),	minor->debugfs_root, minor);
+}
+
+static void hdlcd_debugfs_cleanup(struct drm_minor *minor)
+{
+	drm_debugfs_remove_files(hdlcd_debugfs_list,
+		ARRAY_SIZE(hdlcd_debugfs_list), minor);
+}
+#endif
+
+static const struct file_operations fops = {
+	.owner		= THIS_MODULE,
+	.open		= drm_open,
+	.release	= drm_release,
+	.unlocked_ioctl	= drm_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= drm_compat_ioctl,
+#endif
+	.poll		= drm_poll,
+	.read		= drm_read,
+	.llseek		= no_llseek,
+	.mmap		= drm_gem_cma_mmap,
+};
+
+static struct drm_driver hdlcd_driver = {
+	.driver_features	= DRIVER_HAVE_IRQ | DRIVER_GEM |
+					DRIVER_MODESET | DRIVER_PRIME,
+	.load			= hdlcd_load,
+	.unload			= hdlcd_unload,
+	.preclose		= hdlcd_preclose,
+	.lastclose		= hdlcd_lastclose,
+	.irq_handler		= hdlcd_irq,
+	.irq_preinstall		= hdlcd_irq_preinstall,
+	.irq_postinstall	= hdlcd_irq_postinstall,
+	.irq_uninstall		= hdlcd_irq_uninstall,
+	.set_busid		= drm_platform_set_busid,
+	.get_vblank_counter	= drm_vblank_no_hw_counter,
+	.enable_vblank		= hdlcd_enable_vblank,
+	.disable_vblank		= hdlcd_disable_vblank,
+	.gem_free_object	= drm_gem_cma_free_object,
+	.gem_vm_ops		= &drm_gem_cma_vm_ops,
+	.dumb_create		= drm_gem_cma_dumb_create,
+	.dumb_map_offset	= drm_gem_cma_dumb_map_offset,
+	.dumb_destroy		= drm_gem_dumb_destroy,
+	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
+	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
+	.gem_prime_export	= drm_gem_prime_export,
+	.gem_prime_import	= drm_gem_prime_import,
+	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
+	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
+	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
+	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
+#ifdef CONFIG_DEBUG_FS
+	.debugfs_init		= hdlcd_debugfs_init,
+	.debugfs_cleanup	= hdlcd_debugfs_cleanup,
+#endif
+	.fops			= &fops,
+	.name			= "hdlcd",
+	.desc			= "ARM HDLCD Controller DRM",
+	.date			= "20130505",
+	.major			= 1,
+	.minor			= 0,
+};
+
+static int hdlcd_add_components(struct device *dev, struct master *master)
+{
+	struct device_node *port, *ep = NULL;
+	int ret = -ENXIO;
+
+	if (!dev->of_node)
+		return -ENODEV;
+
+	do {
+		ep = of_graph_get_next_endpoint(dev->of_node, ep);
+		if (!ep)
+			break;
+
+		if (!of_device_is_available(ep)) {
+			of_node_put(ep);
+			continue;
+		}
+
+		port = of_graph_get_remote_port_parent(ep);
+		of_node_put(ep);
+		if (!port || !of_device_is_available(port)) {
+			of_node_put(port);
+			continue;
+		}
+
+		ret = component_master_add_child(master, compare_dev, port);
+		of_node_put(port);
+	} while (1);
+
+	return ret;
+}
+
+static int hdlcd_drm_bind(struct device *dev)
+{
+	return drm_platform_init(&hdlcd_driver, to_platform_device(dev));
+}
+
+static void hdlcd_drm_unbind(struct device *dev)
+{
+	drm_put_dev(dev_get_drvdata(dev));
+}
+
+static const struct component_master_ops hdlcd_master_ops = {
+	.add_components	= hdlcd_add_components,
+	.bind		= hdlcd_drm_bind,
+	.unbind		= hdlcd_drm_unbind,
+};
+
+static int hdlcd_probe(struct platform_device *pdev)
+{
+	return component_master_add(&pdev->dev, &hdlcd_master_ops);
+}
+
+static int hdlcd_remove(struct platform_device *pdev)
+{
+	component_master_del(&pdev->dev, &hdlcd_master_ops);
+	return 0;
+}
+
+static struct of_device_id  hdlcd_of_match[] = {
+	{ .compatible	= "arm,hdlcd" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, hdlcd_of_match);
+
+static struct platform_driver hdlcd_platform_driver = {
+	.probe		= hdlcd_probe,
+	.remove		= hdlcd_remove,
+	.driver	= {
+		.name		= "hdlcd",
+		.owner		= THIS_MODULE,
+		.of_match_table	= hdlcd_of_match,
+	},
+};
+
+static int __init hdlcd_init(void)
+{
+	int err = platform_driver_register(&hdlcd_platform_driver);
+
+#ifdef HDLCD_COUNT_BUFFERUNDERRUNS
+	if (!err)
+		hdlcd_underrun_init();
+#endif
+
+	return err;
+}
+
+static void __exit hdlcd_exit(void)
+{
+#ifdef HDLCD_COUNT_BUFFERUNDERRUNS
+	hdlcd_underrun_close();
+#endif
+	platform_driver_unregister(&hdlcd_platform_driver);
+}
+
+/* need late_initcall() so we load after i2c driver */
+late_initcall(hdlcd_init);
+module_exit(hdlcd_exit);
+
+MODULE_AUTHOR("Liviu Dudau");
+MODULE_DESCRIPTION("ARM HDLCD DRM driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/gpu/drm/arm/hdlcd_drv.h b/drivers/gpu/drm/arm/hdlcd_drv.h
new file mode 100644
index 000000000000..3980276d77bc
--- /dev/null
+++ b/drivers/gpu/drm/arm/hdlcd_drv.h
@@ -0,0 +1,69 @@
+/*
+ *  ARM HDLCD Controller register definition
+ */
+
+#ifndef __HDLCD_DRV_H__
+#define __HDLCD_DRV_H__
+
+struct hdlcd_drm_private {
+	void __iomem			*mmio;
+	struct clk			*clk;
+	struct hdlcd_drm_fbdev		*fbdev;
+	struct drm_framebuffer		*fb;
+	struct drm_pending_vblank_event	*event;
+	struct drm_crtc			crtc;
+	struct completion		frame_completion;
+#ifdef CONFIG_DEBUG_FS
+	atomic_t buffer_underrun_count;
+	atomic_t bus_error_count;
+	atomic_t vsync_count;
+	atomic_t dma_end_count;
+#endif
+	int dpms;
+};
+
+#define crtc_to_hdlcd_priv(x)	container_of(x, struct hdlcd_drm_private, crtc)
+
+static inline void
+hdlcd_write(struct hdlcd_drm_private *hdlcd, unsigned int reg, u32 value)
+{
+	writel(value, hdlcd->mmio + reg);
+}
+
+static inline u32 hdlcd_read(struct hdlcd_drm_private *hdlcd, unsigned int reg)
+{
+	return readl(hdlcd->mmio + reg);
+}
+
+/*
+ * Developers using HDLCD may wish to enable these settings if
+ * display disruption is apparent and you suspect HDLCD
+ * access to RAM may be starved.
+ *
+ * Turn HDLCD default color to red instead of default black so
+ * that it's easier to see data underruns (compared to other
+ * visual disruptions)
+ */
+//#define HDLCD_SHOW_UNDERRUN
+
+/* setup the crtc subclass */
+int hdlcd_setup_crtc(struct drm_device *dev);
+
+/* functions for creating a suitable connector */
+extern int hdlcd_create_digital_connector(struct drm_device *dev,
+					struct hdlcd_drm_private *hdlcd);
+extern int hdlcd_create_vexpress_connector(struct drm_device *dev,
+					struct hdlcd_drm_private *hdlcd);
+#ifdef CONFIG_DRM_VIRTUAL_HDLCD
+extern int hdlcd_create_virtual_connector(struct drm_device *dev);
+#else
+static inline int hdlcd_create_virtual_connector(struct drm_device *dev)
+{
+	return -ENXIO;
+}
+#endif
+
+/* common function used by all connectors */
+extern struct drm_encoder *hdlcd_connector_best_encoder(struct drm_connector *con);
+
+#endif /* __HDLCD_DRV_H__ */
diff --git a/drivers/gpu/drm/arm/hdlcd_fb_helper.c b/drivers/gpu/drm/arm/hdlcd_fb_helper.c
new file mode 100644
index 000000000000..1312e01ef784
--- /dev/null
+++ b/drivers/gpu/drm/arm/hdlcd_fb_helper.c
@@ -0,0 +1,601 @@
+/*
+ * Copied from drivers/gpu/drm/drm_fb_cma_helper.c which has the following
+ * copyright and notices...
+ *
+ * Copyright (C) 2012 Analog Device Inc.
+ *   Author: Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * Based on udl_fbdev.c
+ *  Copyright (C) 2012 Red Hat
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include "hdlcd_fb_helper.h"
+#include <linux/dma-buf.h>
+#include <linux/module.h>
+#include "hdlcd_drv.h"
+
+#define MAX_FRAMES 2
+
+static int hdlcd_fb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg);
+
+/******************************************************************************
+ * Code copied from drivers/gpu/drm/drm_fb_helper.c as of Linux 3.18
+ ******************************************************************************/
+
+/**
+ * Copy of drm_fb_helper_check_var modified to allow MAX_FRAMES * height
+ */
+int hdlcd_fb_helper_check_var(struct fb_var_screeninfo *var,
+			    struct fb_info *info)
+{
+	struct drm_fb_helper *fb_helper = info->par;
+	struct drm_framebuffer *fb = fb_helper->fb;
+	int depth;
+
+	if (var->pixclock != 0 || in_dbg_master())
+		return -EINVAL;
+
+	/* Need to resize the fb object !!! */
+	if (var->bits_per_pixel > fb->bits_per_pixel ||
+	    var->xres > fb->width || var->yres > fb->height ||
+	    var->xres_virtual > fb->width || var->yres_virtual > fb->height * MAX_FRAMES) {
+		DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
+			  "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n",
+			  var->xres, var->yres, var->bits_per_pixel,
+			  var->xres_virtual, var->yres_virtual,
+			  fb->width, fb->height, fb->bits_per_pixel);
+		return -EINVAL;
+	}
+
+	switch (var->bits_per_pixel) {
+	case 16:
+		depth = (var->green.length == 6) ? 16 : 15;
+		break;
+	case 32:
+		depth = (var->transp.length > 0) ? 32 : 24;
+		break;
+	default:
+		depth = var->bits_per_pixel;
+		break;
+	}
+
+	switch (depth) {
+	case 8:
+		var->red.offset = 0;
+		var->green.offset = 0;
+		var->blue.offset = 0;
+		var->red.length = 8;
+		var->green.length = 8;
+		var->blue.length = 8;
+		var->transp.length = 0;
+		var->transp.offset = 0;
+		break;
+	case 15:
+		var->red.offset = 10;
+		var->green.offset = 5;
+		var->blue.offset = 0;
+		var->red.length = 5;
+		var->green.length = 5;
+		var->blue.length = 5;
+		var->transp.length = 1;
+		var->transp.offset = 15;
+		break;
+	case 16:
+		var->red.offset = 11;
+		var->green.offset = 5;
+		var->blue.offset = 0;
+		var->red.length = 5;
+		var->green.length = 6;
+		var->blue.length = 5;
+		var->transp.length = 0;
+		var->transp.offset = 0;
+		break;
+	case 24:
+		var->red.offset = 16;
+		var->green.offset = 8;
+		var->blue.offset = 0;
+		var->red.length = 8;
+		var->green.length = 8;
+		var->blue.length = 8;
+		var->transp.length = 0;
+		var->transp.offset = 0;
+		break;
+	case 32:
+		var->red.offset = 16;
+		var->green.offset = 8;
+		var->blue.offset = 0;
+		var->red.length = 8;
+		var->green.length = 8;
+		var->blue.length = 8;
+		var->transp.length = 8;
+		var->transp.offset = 24;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/******************************************************************************
+ * Code copied from drivers/gpu/drm/drm_fb_cma_helper.c as of Linux 3.18
+ ******************************************************************************/
+
+struct hdlcd_fb {
+	struct drm_framebuffer		fb;
+	struct drm_gem_cma_object	*obj[4];
+};
+
+struct hdlcd_drm_fbdev {
+	struct drm_fb_helper	fb_helper;
+	struct hdlcd_fb	*fb;
+};
+
+static inline struct hdlcd_drm_fbdev *to_hdlcd_fbdev(struct drm_fb_helper *helper)
+{
+	return container_of(helper, struct hdlcd_drm_fbdev, fb_helper);
+}
+
+static inline struct hdlcd_fb *to_hdlcd_fb(struct drm_framebuffer *fb)
+{
+	return container_of(fb, struct hdlcd_fb, fb);
+}
+
+static void hdlcd_fb_destroy(struct drm_framebuffer *fb)
+{
+	struct hdlcd_fb *hdlcd_fb = to_hdlcd_fb(fb);
+	int i;
+
+	for (i = 0; i < 4; i++) {
+		if (hdlcd_fb->obj[i])
+			drm_gem_object_unreference_unlocked(&hdlcd_fb->obj[i]->base);
+	}
+
+	drm_framebuffer_cleanup(fb);
+	kfree(hdlcd_fb);
+}
+
+static int hdlcd_fb_create_handle(struct drm_framebuffer *fb,
+	struct drm_file *file_priv, unsigned int *handle)
+{
+	struct hdlcd_fb *hdlcd_fb = to_hdlcd_fb(fb);
+
+	return drm_gem_handle_create(file_priv,
+			&hdlcd_fb->obj[0]->base, handle);
+}
+
+static struct drm_framebuffer_funcs hdlcd_fb_funcs = {
+	.destroy	= hdlcd_fb_destroy,
+	.create_handle	= hdlcd_fb_create_handle,
+};
+
+static struct hdlcd_fb *hdlcd_fb_alloc(struct drm_device *dev,
+	struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_cma_object **obj,
+	unsigned int num_planes)
+{
+	struct hdlcd_fb *hdlcd_fb;
+	int ret;
+	int i;
+
+	hdlcd_fb = kzalloc(sizeof(*hdlcd_fb), GFP_KERNEL);
+	if (!hdlcd_fb)
+		return ERR_PTR(-ENOMEM);
+
+	drm_helper_mode_fill_fb_struct(&hdlcd_fb->fb, mode_cmd);
+
+	for (i = 0; i < num_planes; i++)
+		hdlcd_fb->obj[i] = obj[i];
+
+	ret = drm_framebuffer_init(dev, &hdlcd_fb->fb, &hdlcd_fb_funcs);
+	if (ret) {
+		dev_err(dev->dev, "Failed to initialize framebuffer: %d\n", ret);
+		kfree(hdlcd_fb);
+		return ERR_PTR(ret);
+	}
+
+	return hdlcd_fb;
+}
+
+/**
+ * hdlcd_fb_create() - (struct drm_mode_config_funcs *)->fb_create callback function
+ *
+ * If your hardware has special alignment or pitch requirements these should be
+ * checked before calling this function.
+ */
+struct drm_framebuffer *hdlcd_fb_create(struct drm_device *dev,
+	struct drm_file *file_priv, struct drm_mode_fb_cmd2 *mode_cmd)
+{
+	struct hdlcd_fb *hdlcd_fb;
+	struct drm_gem_cma_object *objs[4];
+	struct drm_gem_object *obj;
+	unsigned int hsub;
+	unsigned int vsub;
+	int ret;
+	int i;
+
+	hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
+	vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
+
+	for (i = 0; i < drm_format_num_planes(mode_cmd->pixel_format); i++) {
+		unsigned int width = mode_cmd->width / (i ? hsub : 1);
+		unsigned int height = mode_cmd->height / (i ? vsub : 1);
+		unsigned int min_size;
+
+		obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[i]);
+		if (!obj) {
+			dev_err(dev->dev, "Failed to lookup GEM object\n");
+			ret = -ENXIO;
+			goto err_gem_object_unreference;
+		}
+
+		min_size = (height - 1) * mode_cmd->pitches[i]
+			 + width * drm_format_plane_cpp(mode_cmd->pixel_format, i)
+			 + mode_cmd->offsets[i];
+
+		if (obj->size < min_size) {
+			drm_gem_object_unreference_unlocked(obj);
+			ret = -EINVAL;
+			goto err_gem_object_unreference;
+		}
+		objs[i] = to_drm_gem_cma_obj(obj);
+	}
+
+	hdlcd_fb = hdlcd_fb_alloc(dev, mode_cmd, objs, i);
+	if (IS_ERR(hdlcd_fb)) {
+		ret = PTR_ERR(hdlcd_fb);
+		goto err_gem_object_unreference;
+	}
+
+	return &hdlcd_fb->fb;
+
+err_gem_object_unreference:
+	for (i--; i >= 0; i--)
+		drm_gem_object_unreference_unlocked(&objs[i]->base);
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(hdlcd_fb_create);
+
+/**
+ * hdlcd_fb_get_gem_obj() - Get CMA GEM object for framebuffer
+ * @fb: The framebuffer
+ * @plane: Which plane
+ *
+ * Return the CMA GEM object for given framebuffer.
+ *
+ * This function will usually be called from the CRTC callback functions.
+ */
+struct drm_gem_cma_object *hdlcd_fb_get_gem_obj(struct drm_framebuffer *fb,
+	unsigned int plane)
+{
+	struct hdlcd_fb *hdlcd_fb = to_hdlcd_fb(fb);
+
+	if (plane >= 4)
+		return NULL;
+
+	return hdlcd_fb->obj[plane];
+}
+EXPORT_SYMBOL_GPL(hdlcd_fb_get_gem_obj);
+
+#ifdef CONFIG_DEBUG_FS
+/*
+ * hdlcd_fb_describe() - Helper to dump information about a single
+ * CMA framebuffer object
+ */
+static void hdlcd_fb_describe(struct drm_framebuffer *fb, struct seq_file *m)
+{
+	struct hdlcd_fb *hdlcd_fb = to_hdlcd_fb(fb);
+	int i, n = drm_format_num_planes(fb->pixel_format);
+
+	seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
+			(char *)&fb->pixel_format);
+
+	for (i = 0; i < n; i++) {
+		seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
+				i, fb->offsets[i], fb->pitches[i]);
+		drm_gem_cma_describe(hdlcd_fb->obj[i], m);
+	}
+}
+
+/**
+ * hdlcd_fb_debugfs_show() - Helper to list CMA framebuffer objects
+ * in debugfs.
+ */
+int hdlcd_fb_debugfs_show(struct seq_file *m, void *arg)
+{
+	struct drm_info_node *node = (struct drm_info_node *) m->private;
+	struct drm_device *dev = node->minor->dev;
+	struct drm_framebuffer *fb;
+
+	mutex_lock(&dev->mode_config.fb_lock);
+	drm_for_each_fb(fb, dev)
+		hdlcd_fb_describe(fb, m);
+	mutex_unlock(&dev->mode_config.fb_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(hdlcd_fb_debugfs_show);
+#endif
+
+static struct fb_ops hdlcd_drm_fbdev_ops = {
+	.owner		= THIS_MODULE,
+	.fb_fillrect	= drm_fb_helper_sys_fillrect,
+	.fb_copyarea	= drm_fb_helper_sys_copyarea,
+	.fb_imageblit	= drm_fb_helper_sys_imageblit,
+	.fb_check_var	= hdlcd_fb_helper_check_var,
+	.fb_set_par	= drm_fb_helper_set_par,
+	.fb_blank	= drm_fb_helper_blank,
+	.fb_pan_display	= drm_fb_helper_pan_display,
+	.fb_setcmap	= drm_fb_helper_setcmap,
+	.fb_ioctl	= hdlcd_fb_ioctl,
+	.fb_compat_ioctl= hdlcd_fb_ioctl,
+};
+
+static int hdlcd_drm_fbdev_create(struct drm_fb_helper *helper,
+	struct drm_fb_helper_surface_size *sizes)
+{
+	struct hdlcd_drm_fbdev *hdlcd_fbdev = to_hdlcd_fbdev(helper);
+	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
+	struct drm_device *dev = helper->dev;
+	struct drm_gem_cma_object *obj;
+	struct drm_framebuffer *fb;
+	unsigned int bytes_per_pixel;
+	unsigned long offset;
+	struct fb_info *fbi;
+	size_t size;
+	int ret;
+
+	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d)\n",
+			sizes->surface_width, sizes->surface_height,
+			sizes->surface_bpp);
+
+	bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
+
+	mode_cmd.width = sizes->surface_width;
+	mode_cmd.height = sizes->surface_height;
+	mode_cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
+	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
+		sizes->surface_depth);
+
+	size = mode_cmd.pitches[0] * mode_cmd.height * MAX_FRAMES;
+	obj = drm_gem_cma_create(dev, size);
+	if (IS_ERR(obj))
+		return -ENOMEM;
+
+	fbi = drm_fb_helper_alloc_fbi(helper);
+	if (IS_ERR(fbi)) {
+		ret = PTR_ERR(fbi);
+		goto err_drm_gem_cma_free_object;
+	}
+
+	hdlcd_fbdev->fb = hdlcd_fb_alloc(dev, &mode_cmd, &obj, 1);
+	if (IS_ERR(hdlcd_fbdev->fb)) {
+		dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
+		ret = PTR_ERR(hdlcd_fbdev->fb);
+		goto err_fb_info_destroy;
+	}
+
+	fb = &hdlcd_fbdev->fb->fb;
+	helper->fb = fb;
+
+	fbi->par = helper;
+	fbi->flags = FBINFO_FLAG_DEFAULT;
+	fbi->fbops = &hdlcd_drm_fbdev_ops;
+
+	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
+	drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
+
+	offset = fbi->var.xoffset * bytes_per_pixel;
+	offset += fbi->var.yoffset * fb->pitches[0];
+
+	dev->mode_config.fb_base = (resource_size_t)obj->paddr;
+	fbi->screen_base = obj->vaddr + offset;
+	fbi->fix.smem_start = (unsigned long)(obj->paddr + offset);
+	fbi->screen_size = size;
+	fbi->fix.smem_len = size;
+	fbi->var.yres_virtual = fbi->var.yres * MAX_FRAMES;
+
+	return 0;
+
+err_fb_info_destroy:
+	drm_fb_helper_release_fbi(helper);
+err_drm_gem_cma_free_object:
+	drm_gem_cma_free_object(&obj->base);
+	return ret;
+}
+
+static const struct drm_fb_helper_funcs hdlcd_fb_helper_funcs = {
+	.fb_probe = hdlcd_drm_fbdev_create,
+};
+
+/**
+ * hdlcd_drm_fbdev_init() - Allocate and initializes a hdlcd_drm_fbdev struct
+ * @dev: DRM device
+ * @preferred_bpp: Preferred bits per pixel for the device
+ * @num_crtc: Number of CRTCs
+ * @max_conn_count: Maximum number of connectors
+ *
+ * Returns a newly allocated hdlcd_drm_fbdev struct or a ERR_PTR.
+ */
+struct hdlcd_drm_fbdev *hdlcd_drm_fbdev_init(struct drm_device *dev,
+	unsigned int preferred_bpp, unsigned int num_crtc,
+	unsigned int max_conn_count)
+{
+	struct hdlcd_drm_fbdev *hdlcd_fbdev;
+	struct drm_fb_helper *helper;
+	int ret;
+
+	hdlcd_fbdev = kzalloc(sizeof(*hdlcd_fbdev), GFP_KERNEL);
+	if (!hdlcd_fbdev) {
+		dev_err(dev->dev, "Failed to allocate drm fbdev.\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	helper = &hdlcd_fbdev->fb_helper;
+
+	drm_fb_helper_prepare(dev, helper, &hdlcd_fb_helper_funcs);
+
+	ret = drm_fb_helper_init(dev, helper, num_crtc, max_conn_count);
+	if (ret < 0) {
+		dev_err(dev->dev, "Failed to initialize drm fb helper.\n");
+		goto err_free;
+	}
+
+	ret = drm_fb_helper_single_add_all_connectors(helper);
+	if (ret < 0) {
+		dev_err(dev->dev, "Failed to add connectors.\n");
+		goto err_drm_fb_helper_fini;
+
+	}
+
+	/* disable all the possible outputs/crtcs before entering KMS mode */
+	drm_helper_disable_unused_functions(dev);
+
+	ret = drm_fb_helper_initial_config(helper, preferred_bpp);
+	if (ret < 0) {
+		dev_err(dev->dev, "Failed to set initial hw configuration.\n");
+		goto err_drm_fb_helper_fini;
+	}
+
+	return hdlcd_fbdev;
+
+err_drm_fb_helper_fini:
+	drm_fb_helper_fini(helper);
+err_free:
+	kfree(hdlcd_fbdev);
+
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(hdlcd_drm_fbdev_init);
+
+/**
+ * hdlcd_drm_fbdev_fini() - Free hdlcd_drm_fbdev struct
+ * @hdlcd_fbdev: The hdlcd_drm_fbdev struct
+ */
+void hdlcd_drm_fbdev_fini(struct hdlcd_drm_fbdev *hdlcd_fbdev)
+{
+	drm_fb_helper_unregister_fbi(&hdlcd_fbdev->fb_helper);
+	drm_fb_helper_release_fbi(&hdlcd_fbdev->fb_helper);
+
+	if (hdlcd_fbdev->fb) {
+		drm_framebuffer_unregister_private(&hdlcd_fbdev->fb->fb);
+		hdlcd_fb_destroy(&hdlcd_fbdev->fb->fb);
+	}
+
+	drm_fb_helper_fini(&hdlcd_fbdev->fb_helper);
+	kfree(hdlcd_fbdev);
+}
+EXPORT_SYMBOL_GPL(hdlcd_drm_fbdev_fini);
+
+/**
+ * hdlcd_drm_fbdev_restore_mode() - Restores initial framebuffer mode
+ * @hdlcd_fbdev: The hdlcd_drm_fbdev struct, may be NULL
+ *
+ * This function is usually called from the DRM drivers lastclose callback.
+ */
+void hdlcd_drm_fbdev_restore_mode(struct hdlcd_drm_fbdev *hdlcd_fbdev)
+{
+	if (hdlcd_fbdev)
+		drm_fb_helper_restore_fbdev_mode_unlocked(&hdlcd_fbdev->fb_helper);
+}
+EXPORT_SYMBOL_GPL(hdlcd_drm_fbdev_restore_mode);
+
+/**
+ * hdlcd_drm_fbdev_hotplug_event() - Poll for hotpulug events
+ * @hdlcd_fbdev: The hdlcd_drm_fbdev struct, may be NULL
+ *
+ * This function is usually called from the DRM drivers output_poll_changed
+ * callback.
+ */
+void hdlcd_drm_fbdev_hotplug_event(struct hdlcd_drm_fbdev *hdlcd_fbdev)
+{
+	if (hdlcd_fbdev)
+		drm_fb_helper_hotplug_event(&hdlcd_fbdev->fb_helper);
+}
+EXPORT_SYMBOL_GPL(hdlcd_drm_fbdev_hotplug_event);
+
+
+/******************************************************************************
+ * IOCTL Interface
+ ******************************************************************************/
+
+/*
+ * Used for sharing buffers with Mali userspace
+ */
+struct fb_dmabuf_export {
+	uint32_t fd;
+	uint32_t flags;
+};
+
+#define FBIOGET_DMABUF       _IOR('F', 0x21, struct fb_dmabuf_export)
+
+static int hdlcd_get_dmabuf_ioctl(struct fb_info *info, unsigned int cmd,
+				  unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	struct fb_dmabuf_export ebuf;
+	struct drm_fb_helper *helper = info->par;
+	struct hdlcd_drm_private *hdlcd = helper->dev->dev_private;
+	struct drm_gem_cma_object *obj = hdlcd->fbdev->fb->obj[0];
+	struct dma_buf *dma_buf;
+	uint32_t fd;
+
+	if (copy_from_user(&ebuf, argp, sizeof(ebuf)))
+		return -EFAULT;
+
+	/*
+	 * We need a reference on the gem object. This will be released by
+	 * drm_gem_dmabuf_release when the file descriptor is closed.
+	 */
+	drm_gem_object_reference(&obj->base);
+
+	dma_buf = drm_gem_prime_export(helper->dev, &obj->base, ebuf.flags | O_RDWR);
+	if (!dma_buf) {
+		dev_info(info->dev, "Failed to export DMA buffer\n");
+		goto err_export;
+	}
+
+	fd = dma_buf_fd(dma_buf, O_CLOEXEC);
+	if (fd < 0) {
+		dev_info(info->dev, "Failed to get file descriptor for DMA buffer\n");
+		goto err_export_fd;
+	}
+	ebuf.fd = fd;
+
+	if (copy_to_user(argp, &ebuf, sizeof(ebuf)))
+		goto err_export_fd;
+
+	return 0;
+
+err_export_fd:
+	dma_buf_put(dma_buf);
+err_export:
+	drm_gem_object_unreference(&obj->base);
+	return -EFAULT;
+}
+
+static int hdlcd_fb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	case FBIOGET_DMABUF:
+		return hdlcd_get_dmabuf_ioctl(info, cmd, arg);
+	case FBIO_WAITFORVSYNC:
+		return 0; /* Nothing to do as we wait when page flipping anyway */
+	default:
+		printk(KERN_INFO "HDLCD FB does not handle ioctl 0x%x\n", cmd);
+	}
+
+	return -EFAULT;
+}
diff --git a/drivers/gpu/drm/arm/hdlcd_fb_helper.h b/drivers/gpu/drm/arm/hdlcd_fb_helper.h
new file mode 100644
index 000000000000..23e268db972f
--- /dev/null
+++ b/drivers/gpu/drm/arm/hdlcd_fb_helper.h
@@ -0,0 +1,31 @@
+#ifndef __DRM_FB_CMA_HELPER_H__
+#define __DRM_FB_CMA_HELPER_H__
+
+struct hdlcd_drm_fbdev;
+struct drm_gem_cma_object;
+
+struct drm_framebuffer;
+struct drm_device;
+struct drm_file;
+struct drm_mode_fb_cmd2;
+
+struct hdlcd_drm_fbdev *hdlcd_drm_fbdev_init(struct drm_device *dev,
+	unsigned int preferred_bpp, unsigned int num_crtc,
+	unsigned int max_conn_count);
+void hdlcd_drm_fbdev_fini(struct hdlcd_drm_fbdev *hdlcd_fbdev);
+
+void hdlcd_drm_fbdev_restore_mode(struct hdlcd_drm_fbdev *hdlcd_fbdev);
+void hdlcd_drm_fbdev_hotplug_event(struct hdlcd_drm_fbdev *hdlcd_fbdev);
+
+struct drm_framebuffer *hdlcd_fb_create(struct drm_device *dev,
+	struct drm_file *file_priv, struct drm_mode_fb_cmd2 *mode_cmd);
+
+struct drm_gem_cma_object *hdlcd_fb_get_gem_obj(struct drm_framebuffer *fb,
+	unsigned int plane);
+
+#ifdef CONFIG_DEBUG_FS
+int hdlcd_fb_debugfs_show(struct seq_file *m, void *arg);
+#endif
+
+#endif
+
diff --git a/drivers/gpu/drm/arm/hdlcd_regs.h b/drivers/gpu/drm/arm/hdlcd_regs.h
new file mode 100644
index 000000000000..66799ebef6d3
--- /dev/null
+++ b/drivers/gpu/drm/arm/hdlcd_regs.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2013,2014 ARM Limited
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ *
+ *  ARM HDLCD Controller register definition
+ */
+
+#ifndef __HDLCD_REGS_H__
+#define __HDLCD_REGS_H__
+
+/* register offsets */
+#define HDLCD_REG_VERSION		0x0000	/* ro */
+#define HDLCD_REG_INT_RAWSTAT		0x0010	/* rw */
+#define HDLCD_REG_INT_CLEAR		0x0014	/* wo */
+#define HDLCD_REG_INT_MASK		0x0018	/* rw */
+#define HDLCD_REG_INT_STATUS		0x001c	/* ro */
+#define HDLCD_REG_FB_BASE		0x0100	/* rw */
+#define HDLCD_REG_FB_LINE_LENGTH	0x0104	/* rw */
+#define HDLCD_REG_FB_LINE_COUNT		0x0108	/* rw */
+#define HDLCD_REG_FB_LINE_PITCH		0x010c	/* rw */
+#define HDLCD_REG_BUS_OPTIONS		0x0110	/* rw */
+#define HDLCD_REG_V_SYNC		0x0200	/* rw */
+#define HDLCD_REG_V_BACK_PORCH		0x0204	/* rw */
+#define HDLCD_REG_V_DATA		0x0208	/* rw */
+#define HDLCD_REG_V_FRONT_PORCH		0x020c	/* rw */
+#define HDLCD_REG_H_SYNC		0x0210	/* rw */
+#define HDLCD_REG_H_BACK_PORCH		0x0214	/* rw */
+#define HDLCD_REG_H_DATA		0x0218	/* rw */
+#define HDLCD_REG_H_FRONT_PORCH		0x021c	/* rw */
+#define HDLCD_REG_POLARITIES		0x0220	/* rw */
+#define HDLCD_REG_COMMAND		0x0230	/* rw */
+#define HDLCD_REG_PIXEL_FORMAT		0x0240	/* rw */
+#define HDLCD_REG_RED_SELECT		0x0244	/* rw */
+#define HDLCD_REG_GREEN_SELECT		0x0248	/* rw */
+#define HDLCD_REG_BLUE_SELECT		0x024c	/* rw */
+
+/* version */
+#define HDLCD_PRODUCT_ID		0x1CDC0000
+#define HDLCD_PRODUCT_MASK		0xFFFF0000
+#define HDLCD_VERSION_MAJOR_MASK	0x0000FF00
+#define HDLCD_VERSION_MINOR_MASK	0x000000FF
+
+/* interrupts */
+#define HDLCD_INTERRUPT_DMA_END		(1 << 0)
+#define HDLCD_INTERRUPT_BUS_ERROR	(1 << 1)
+#define HDLCD_INTERRUPT_VSYNC		(1 << 2)
+#define HDLCD_INTERRUPT_UNDERRUN	(1 << 3)
+#define HDLCD_DEBUG_INT_MASK		(HDLCD_INTERRUPT_DMA_END |  \
+					HDLCD_INTERRUPT_BUS_ERROR | \
+					HDLCD_INTERRUPT_UNDERRUN)
+
+/* polarities */
+#define HDLCD_POLARITY_VSYNC		(1 << 0)
+#define HDLCD_POLARITY_HSYNC		(1 << 1)
+#define HDLCD_POLARITY_DATAEN		(1 << 2)
+#define HDLCD_POLARITY_DATA		(1 << 3)
+#define HDLCD_POLARITY_PIXELCLK		(1 << 4)
+
+/* commands */
+#define HDLCD_COMMAND_DISABLE		(0 << 0)
+#define HDLCD_COMMAND_ENABLE		(1 << 0)
+
+/* pixel format */
+#define HDLCD_PIXEL_FMT_LITTLE_ENDIAN	(0 << 31)
+#define HDLCD_PIXEL_FMT_BIG_ENDIAN	(1 << 31)
+#define HDLCD_BYTES_PER_PIXEL_MASK	(3 << 3)
+
+/* bus options */
+#define HDLCD_BUS_BURST_MASK		0x01f
+#define HDLCD_BUS_MAX_OUTSTAND		0xf00
+#define HDLCD_BUS_BURST_NONE		(0 << 0)
+#define HDLCD_BUS_BURST_1		(1 << 0)
+#define HDLCD_BUS_BURST_2		(1 << 1)
+#define HDLCD_BUS_BURST_4		(1 << 2)
+#define HDLCD_BUS_BURST_8		(1 << 3)
+#define HDLCD_BUS_BURST_16		(1 << 4)
+
+/* Max resolution supported is 4096x4096, 32bpp */
+#define HDLCD_MAX_XRES			4096
+#define HDLCD_MAX_YRES			4096
+
+#define NR_PALETTE			256
+
+#endif /* __HDLCD_REGS_H__ */
diff --git a/drivers/gpu/drm/arm/hdlcd_vexpress_encoder.c b/drivers/gpu/drm/arm/hdlcd_vexpress_encoder.c
new file mode 100644
index 000000000000..c03d367cdf9b
--- /dev/null
+++ b/drivers/gpu/drm/arm/hdlcd_vexpress_encoder.c
@@ -0,0 +1,243 @@
+/*
+ * Copyright (C) 2013,2014 ARM Limited
+ * Author: Liviu Dudau <Liviu.Dudau@arm.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ *
+ */
+
+#include <linux/i2c.h>
+#include <drm/drmP.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_encoder_slave.h>
+#include <video/display_timing.h>
+#include <video/of_display_timing.h>
+#include <video/videomode.h>
+
+#include <linux/vexpress.h>
+
+#include "hdlcd_drv.h"
+
+/*
+ * use the functionality of vexpress-config to set the output mode
+ * for HDLCD on Versatile Express boards that lack proper control
+ * of the DDC i2c chip.
+ */
+
+//static struct vexpress_config_func *vconfig_func;
+
+/*
+ * Predefined modes that are available through the VExpress micro
+ */
+static const struct {
+	int hsize, vsize, vrefresh, dvimode;
+} vexpress_dvimodes[] = {
+	{  640,  480, 60, 0 }, /* VGA */
+	{  800,  600, 60, 1 }, /* SVGA */
+	{ 1024,  768, 60, 2 }, /* XGA */
+	{ 1280, 1024, 60, 3 }, /* SXGA */
+	{ 1600, 1200, 60, 4 }, /* UXGA */
+	{ 1920, 1080, 60, 5 }, /* HD1080 */
+};
+
+static void hdlcd_connector_destroy(struct drm_connector *connector)
+{
+}
+
+static enum drm_connector_status
+hdlcd_connector_detect(struct drm_connector *connector, bool force)
+{
+	//if (vconfig_func)
+		return connector_status_connected;
+		//return connector_status_disconnected;
+}
+
+static const struct drm_connector_funcs hdlcd_connector_funcs = {
+	.destroy = hdlcd_connector_destroy,
+	.dpms = drm_helper_connector_dpms,
+	.detect = hdlcd_connector_detect,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+};
+
+static int hdlcd_vexpress_con_get_modes(struct drm_connector *connector)
+{
+	int i;
+	struct drm_display_mode *mode;
+
+	/* Add the predefined modes */
+	for (i = 0; i < ARRAY_SIZE(vexpress_dvimodes); i++) {
+		mode = drm_mode_find_dmt(connector->dev,
+					vexpress_dvimodes[i].hsize,
+					vexpress_dvimodes[i].vsize,
+					vexpress_dvimodes[i].vrefresh, false);
+		if (!mode)
+			continue;
+		/* prefer the 1280x1024 mode */
+		if (i == 3)
+			mode->type |= DRM_MODE_TYPE_PREFERRED;
+		drm_mode_probed_add(connector, mode);
+	}
+
+	return i;
+}
+
+/*
+ * mode valid is only called for detected modes and we know that
+ * the restricted list is correct ;)
+ */
+static int hdlcd_vexpress_con_mode_valid(struct drm_connector *connector,
+				struct drm_display_mode *mode)
+{
+	return MODE_OK;
+}
+
+static const struct drm_connector_helper_funcs hdlcd_vexpress_con_helper_funcs = {
+	.get_modes	= hdlcd_vexpress_con_get_modes,
+	.mode_valid	= hdlcd_vexpress_con_mode_valid,
+	.best_encoder	= hdlcd_connector_best_encoder,
+};
+
+
+static void hdlcd_vexpress_encoder_destroy(struct drm_encoder *encoder)
+{
+	drm_encoder_cleanup(encoder);
+	kfree(encoder);
+	/*if (vconfig_func)
+	  vexpress_config_func_put(vconfig_func);*/
+}
+
+static const struct drm_encoder_funcs hdlcd_vexpress_encoder_funcs = {
+	.destroy = hdlcd_vexpress_encoder_destroy,
+};
+
+static void hdlcd_vexpress_encoder_dpms(struct drm_encoder *encoder, int mode)
+{
+	/* VExpress micro has no support for DPMS */
+}
+
+static bool hdlcd_vexpress_encoder_mode_fixup(struct drm_encoder *encoder,
+					const struct drm_display_mode *mode,
+					struct drm_display_mode *adjusted_mode)
+{
+	/* nothing needs to be done here */
+	return true;
+}
+
+static void hdlcd_vexpress_encoder_prepare(struct drm_encoder *encoder)
+{
+	hdlcd_vexpress_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
+}
+
+static void hdlcd_vexpress_encoder_commit(struct drm_encoder *encoder)
+{
+	hdlcd_vexpress_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
+}
+
+static void hdlcd_vexpress_encoder_mode_set(struct drm_encoder *encoder,
+					struct drm_display_mode *mode,
+					struct drm_display_mode *adjusted_mode)
+{
+	/*if (vconfig_func) {
+		int i, vrefresh = drm_mode_vrefresh(mode);
+
+		for (i = 0; i < ARRAY_SIZE(vexpress_dvimodes); i++) {
+			if (vexpress_dvimodes[i].hsize != mode->hdisplay)
+				continue;
+			if (vexpress_dvimodes[i].vsize != mode->vdisplay)
+				continue;
+			if (vexpress_dvimodes[i].vrefresh != vrefresh)
+				continue;
+
+			vexpress_config_write(vconfig_func, 0,
+					vexpress_dvimodes[i].dvimode);
+			return;
+		}
+	}*/
+}
+
+static const struct drm_encoder_helper_funcs
+hdlcd_vexpress_encoder_helper_funcs = {
+	.dpms		= hdlcd_vexpress_encoder_dpms,
+	.mode_fixup	= hdlcd_vexpress_encoder_mode_fixup,
+	.prepare	= hdlcd_vexpress_encoder_prepare,
+	.commit		= hdlcd_vexpress_encoder_commit,
+	.mode_set	= hdlcd_vexpress_encoder_mode_set,
+};
+
+static const struct of_device_id vexpress_dvi_match[] = {
+	{ .compatible = "arm,vexpress-dvimode" },
+	{}
+};
+
+int hdlcd_create_vexpress_connector(struct drm_device *dev,
+				struct hdlcd_drm_private *hdlcd)
+{
+	int err;
+	struct drm_connector *connector;
+	struct device_node *node;
+	struct drm_encoder *encoder;
+
+	node = of_find_matching_node(NULL, vexpress_dvi_match);
+	if (!node)
+		return -ENXIO;
+
+	/*
+	vconfig_func = vexpress_config_func_get_by_node(node);
+	if (!vconfig_func) {
+		DRM_ERROR("failed to get an output connector\n");
+		return -ENXIO;
+	}*/
+
+	encoder = kzalloc(sizeof(*encoder), GFP_KERNEL);
+	if (!encoder) {
+		err = -ENOMEM;
+		goto encoder_alloc_fail;
+	}
+
+	encoder->possible_crtcs = 1;
+	encoder->possible_clones = 0;
+	err = drm_encoder_init(dev, encoder, &hdlcd_vexpress_encoder_funcs,
+			DRM_MODE_ENCODER_TMDS);
+	if (err)
+		goto encoder_init_fail;
+
+	drm_encoder_helper_add(encoder, &hdlcd_vexpress_encoder_helper_funcs);
+
+	connector = kzalloc(sizeof(*connector), GFP_KERNEL);
+	if (!connector) {
+		err = -ENOMEM;
+		goto connector_alloc_err;
+	}
+
+	connector->interlace_allowed = false;
+	connector->doublescan_allowed = false;
+	connector->polled = 0;
+	err = drm_connector_init(dev, connector, &hdlcd_connector_funcs,
+						DRM_MODE_CONNECTOR_DVID);
+	if (err)
+		goto connector_init_err;
+
+	drm_connector_helper_add(connector, &hdlcd_vexpress_con_helper_funcs);
+
+	connector->encoder = encoder;
+	err = drm_mode_connector_attach_encoder(connector, encoder);
+	if (err)
+		goto connector_attach_err;
+
+	return 0;
+
+connector_attach_err:
+	drm_connector_cleanup(connector);
+connector_init_err:
+	kfree(connector);
+connector_alloc_err:
+	drm_encoder_cleanup(encoder);
+encoder_init_fail:
+	kfree(encoder);
+encoder_alloc_fail:
+	//vexpress_config_func_put(vconfig_func);
+
+	return err;
+}
diff --git a/drivers/gpu/drm/arm/hdlcd_virt_encoder.c b/drivers/gpu/drm/arm/hdlcd_virt_encoder.c
new file mode 100644
index 000000000000..2200c4a46b42
--- /dev/null
+++ b/drivers/gpu/drm/arm/hdlcd_virt_encoder.c
@@ -0,0 +1,199 @@
+/*
+ * Copyright (C) 2013,2014 ARM Limited
+ * Author: Liviu Dudau <Liviu.Dudau@arm.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ *
+ */
+
+#include <linux/i2c.h>
+#include <drm/drmP.h>
+#include <drm/drm_crtc_helper.h>
+#include <video/display_timing.h>
+#include <video/of_display_timing.h>
+#include <video/videomode.h>
+
+#include "hdlcd_drv.h"
+
+struct hdlcd_connector {
+	struct drm_connector	connector;
+	struct display_timings	*timings;
+};
+
+#define conn_to_hdlcd(x) container_of(x, struct hdlcd_connector, connector)
+
+static void hdlcd_connector_destroy(struct drm_connector *connector)
+{
+	struct hdlcd_connector *hdlcd = conn_to_hdlcd(connector);
+
+	drm_connector_cleanup(connector);
+	kfree(hdlcd);
+}
+
+static enum drm_connector_status hdlcd_connector_detect(
+		struct drm_connector *connector, bool force)
+{
+	return connector_status_connected;
+}
+
+static const struct drm_connector_funcs hdlcd_connector_funcs = {
+	.destroy	= hdlcd_connector_destroy,
+	.dpms		= drm_helper_connector_dpms,
+	.detect		= hdlcd_connector_detect,
+	.fill_modes	= drm_helper_probe_single_connector_modes,
+};
+
+static int hdlcd_connector_get_modes(struct drm_connector *connector)
+{
+	struct hdlcd_connector *hdlcd = conn_to_hdlcd(connector);
+	struct display_timings *timings = hdlcd->timings;
+	int i;
+
+	for (i = 0; i < timings->num_timings; i++) {
+		struct drm_display_mode *mode = drm_mode_create(connector->dev);
+		struct videomode vm;
+
+		if (videomode_from_timings(timings, &vm, i))
+			break;
+
+		drm_display_mode_from_videomode(&vm, mode);
+		mode->type = DRM_MODE_TYPE_DRIVER;
+		if (timings->native_mode == i)
+			mode->type = DRM_MODE_TYPE_PREFERRED;
+
+		drm_mode_set_name(mode);
+		drm_mode_probed_add(connector, mode);
+	}
+
+	return i;
+}
+
+static int hdlcd_connector_mode_valid(struct drm_connector *connector,
+				struct drm_display_mode *mode)
+{
+	return MODE_OK;
+}
+
+static const struct drm_connector_helper_funcs hdlcd_virt_con_helper_funcs = {
+	.get_modes	= hdlcd_connector_get_modes,
+	.mode_valid	= hdlcd_connector_mode_valid,
+	.best_encoder	= hdlcd_connector_best_encoder,
+};
+
+static void hdlcd_encoder_destroy(struct drm_encoder *encoder)
+{
+	drm_encoder_cleanup(encoder);
+	kfree(encoder);
+}
+
+static const struct drm_encoder_funcs hdlcd_encoder_funcs = {
+	.destroy = hdlcd_encoder_destroy,
+};
+
+static void hdlcd_encoder_dpms(struct drm_encoder *encoder, int mode)
+{
+}
+
+static bool hdlcd_encoder_mode_fixup(struct drm_encoder *encoder,
+				const struct drm_display_mode *mode,
+				struct drm_display_mode *adjusted_mode)
+{
+	/* nothing needed */
+	return true;
+}
+
+static void hdlcd_encoder_prepare(struct drm_encoder *encoder)
+{
+	hdlcd_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
+}
+
+static void hdlcd_encoder_commit(struct drm_encoder *encoder)
+{
+	hdlcd_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
+}
+
+static void hdlcd_encoder_mode_set(struct drm_encoder *encoder,
+				struct drm_display_mode *mode,
+				struct drm_display_mode *adjusted_mode)
+{
+	/* nothing needed */
+}
+
+static const struct drm_encoder_helper_funcs hdlcd_encoder_helper_funcs = {
+	.dpms		= hdlcd_encoder_dpms,
+	.mode_fixup	= hdlcd_encoder_mode_fixup,
+	.prepare	= hdlcd_encoder_prepare,
+	.commit		= hdlcd_encoder_commit,
+	.mode_set	= hdlcd_encoder_mode_set,
+};
+
+int hdlcd_create_virtual_connector(struct drm_device *dev)
+{
+	struct drm_encoder *encoder;
+	struct hdlcd_connector *hdlcdc;
+	struct drm_connector *connector;
+	int ret;
+
+	encoder = kzalloc(sizeof(*encoder), GFP_KERNEL);
+	if (!encoder)
+		return -ENOMEM;
+
+	encoder->possible_crtcs = 1;
+	encoder->possible_clones = 0;
+
+	ret = drm_encoder_init(dev, encoder, &hdlcd_encoder_funcs,
+			DRM_MODE_ENCODER_VIRTUAL);
+	if (ret)
+		goto encoder_init_err;
+
+	drm_encoder_helper_add(encoder, &hdlcd_encoder_helper_funcs);
+
+	hdlcdc = kzalloc(sizeof(*hdlcdc), GFP_KERNEL);
+	if (!hdlcdc) {
+		ret = -ENOMEM;
+		goto connector_alloc_err;
+	}
+
+	hdlcdc->timings = of_get_display_timings(dev->platformdev->dev.of_node);
+	if (!hdlcdc->timings) {
+		DRM_ERROR("failed to get display panel timings\n");
+		ret = -ENXIO;
+		goto connector_init_err;
+	}
+
+	connector = &hdlcdc->connector;
+
+	/* bogus values, pretend we're a 24" screen */
+	connector->display_info.width_mm = 519;
+	connector->display_info.height_mm = 324;
+	connector->interlace_allowed = false;
+	connector->doublescan_allowed = false;
+	connector->polled = 0;
+	ret = drm_connector_init(dev, connector, &hdlcd_connector_funcs,
+				DRM_MODE_CONNECTOR_VIRTUAL);
+	if (ret)
+		goto connector_init_err;
+
+	drm_connector_helper_add(connector, &hdlcd_virt_con_helper_funcs);
+
+	connector->encoder = encoder;
+	ret = drm_mode_connector_attach_encoder(connector, encoder);
+	if (ret)
+		goto attach_err;
+
+
+	return ret;
+
+attach_err:
+	drm_connector_cleanup(connector);
+connector_init_err:
+	kfree(hdlcdc);
+connector_alloc_err:
+	drm_encoder_cleanup(encoder);
+encoder_init_err:
+	kfree(encoder);
+
+	return ret;
+};
diff --git a/drivers/gpu/drm/i2c/Kconfig b/drivers/gpu/drm/i2c/Kconfig
index 22c7ed63a001..338d224e1e62 100644
--- a/drivers/gpu/drm/i2c/Kconfig
+++ b/drivers/gpu/drm/i2c/Kconfig
@@ -17,6 +17,9 @@ config DRM_I2C_CH7006
 	  This driver is currently only useful if you're also using
 	  the nouveau driver.
 
+config DRM_I2C_DUMMY
+	tristate "Dummy stub driver"
+
 config DRM_I2C_SIL164
 	tristate "Silicon Image sil164 TMDS transmitter"
 	default m if DRM_NOUVEAU
diff --git a/drivers/gpu/drm/i2c/Makefile b/drivers/gpu/drm/i2c/Makefile
index f897c2cfd2d1..59aea5aa1fff 100644
--- a/drivers/gpu/drm/i2c/Makefile
+++ b/drivers/gpu/drm/i2c/Makefile
@@ -5,6 +5,8 @@ obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511.o
 ch7006-y := ch7006_drv.o ch7006_mode.o
 obj-$(CONFIG_DRM_I2C_CH7006) += ch7006.o
 
+obj-$(CONFIG_DRM_I2C_DUMMY) += dummy_drm_i2c_drv.o
+
 sil164-y := sil164_drv.o
 obj-$(CONFIG_DRM_I2C_SIL164) += sil164.o
 
diff --git a/drivers/gpu/drm/i2c/dummy_drm_i2c_drv.c b/drivers/gpu/drm/i2c/dummy_drm_i2c_drv.c
new file mode 100644
index 000000000000..7817c802a6e3
--- /dev/null
+++ b/drivers/gpu/drm/i2c/dummy_drm_i2c_drv.c
@@ -0,0 +1,454 @@
+/*
+ * This file was originally based on tda998x_drv.c which has the following
+ * copyright and licence...
+ *
+ * Copyright (C) 2012 Texas Instruments
+ * Author: Rob Clark <robdclark@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/component.h>
+#include <linux/module.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_encoder_slave.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_of.h>
+
+struct dummy_priv {
+	struct drm_encoder *encoder;
+};
+
+struct dummy_encoder_params {
+};
+
+#define to_dummy_priv(x)  ((struct dummy_priv *)to_encoder_slave(x)->slave_priv)
+
+/* DRM encoder functions */
+
+static void dummy_encoder_set_config(struct dummy_priv *priv,
+				       const struct dummy_encoder_params *p)
+{
+}
+
+static void dummy_encoder_dpms(struct dummy_priv *priv, int mode)
+{
+}
+
+static void
+dummy_encoder_save(struct drm_encoder *encoder)
+{
+}
+
+static void
+dummy_encoder_restore(struct drm_encoder *encoder)
+{
+}
+
+static bool
+dummy_encoder_mode_fixup(struct drm_encoder *encoder,
+			  const struct drm_display_mode *mode,
+			  struct drm_display_mode *adjusted_mode)
+{
+	return true;
+}
+
+static int dummy_encoder_mode_valid(struct dummy_priv *priv,
+				      struct drm_display_mode *mode)
+{
+	return MODE_OK;
+}
+
+static void
+dummy_encoder_mode_set(struct dummy_priv *priv,
+			 struct drm_display_mode *mode,
+			 struct drm_display_mode *adjusted_mode)
+{
+}
+
+static enum drm_connector_status
+dummy_encoder_detect(struct dummy_priv *priv)
+{
+	return connector_status_connected;
+}
+
+
+static const u8 edid_1024x768[] = {
+	/*
+	 * These values are a copy of Documentation/EDID/1024x768.c
+	 * produced by executing "make -C Documentation/EDID"
+	 */
+	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
+	0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x05, 0x16, 0x01, 0x03, 0x6d, 0x23, 0x1a, 0x78,
+	0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
+	0x20, 0x50, 0x54, 0x00, 0x08, 0x00, 0x61, 0x40,
+	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x64, 0x19,
+	0x00, 0x40, 0x41, 0x00, 0x26, 0x30, 0x08, 0x90,
+	0x36, 0x00, 0x63, 0x0a, 0x11, 0x00, 0x00, 0x18,
+	0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
+	0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
+	0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
+	0x3d, 0x2f, 0x31, 0x07, 0x00, 0x0a, 0x20, 0x20,
+	0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
+	0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x58,
+	0x47, 0x41, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x55
+};
+
+static int
+dummy_encoder_get_modes(struct dummy_priv *priv,
+			  struct drm_connector *connector)
+{
+	struct edid *edid = (struct edid *)edid_1024x768;
+	int n;
+
+	drm_mode_connector_update_edid_property(connector, edid);
+	n = drm_add_edid_modes(connector, edid);
+
+	return n;
+}
+
+static int
+dummy_encoder_set_property(struct drm_encoder *encoder,
+			    struct drm_connector *connector,
+			    struct drm_property *property,
+			    uint64_t val)
+{
+	return 0;
+}
+
+static void dummy_destroy(struct dummy_priv *priv)
+{
+}
+
+/* Slave encoder support */
+
+static void
+dummy_encoder_slave_set_config(struct drm_encoder *encoder, void *params)
+{
+	dummy_encoder_set_config(to_dummy_priv(encoder), params);
+}
+
+static void dummy_encoder_slave_destroy(struct drm_encoder *encoder)
+{
+	struct dummy_priv *priv = to_dummy_priv(encoder);
+
+	dummy_destroy(priv);
+	drm_i2c_encoder_destroy(encoder);
+	kfree(priv);
+}
+
+static void dummy_encoder_slave_dpms(struct drm_encoder *encoder, int mode)
+{
+	dummy_encoder_dpms(to_dummy_priv(encoder), mode);
+}
+
+static int dummy_encoder_slave_mode_valid(struct drm_encoder *encoder,
+					    struct drm_display_mode *mode)
+{
+	return dummy_encoder_mode_valid(to_dummy_priv(encoder), mode);
+}
+
+static void
+dummy_encoder_slave_mode_set(struct drm_encoder *encoder,
+			       struct drm_display_mode *mode,
+			       struct drm_display_mode *adjusted_mode)
+{
+	dummy_encoder_mode_set(to_dummy_priv(encoder), mode, adjusted_mode);
+}
+
+static enum drm_connector_status
+dummy_encoder_slave_detect(struct drm_encoder *encoder,
+			     struct drm_connector *connector)
+{
+	return dummy_encoder_detect(to_dummy_priv(encoder));
+}
+
+static int dummy_encoder_slave_get_modes(struct drm_encoder *encoder,
+					   struct drm_connector *connector)
+{
+	return dummy_encoder_get_modes(to_dummy_priv(encoder), connector);
+}
+
+static int
+dummy_encoder_slave_create_resources(struct drm_encoder *encoder,
+				       struct drm_connector *connector)
+{
+	return 0;
+}
+
+static struct drm_encoder_slave_funcs dummy_encoder_slave_funcs = {
+	.set_config = dummy_encoder_slave_set_config,
+	.destroy = dummy_encoder_slave_destroy,
+	.dpms = dummy_encoder_slave_dpms,
+	.save = dummy_encoder_save,
+	.restore = dummy_encoder_restore,
+	.mode_fixup = dummy_encoder_mode_fixup,
+	.mode_valid = dummy_encoder_slave_mode_valid,
+	.mode_set = dummy_encoder_slave_mode_set,
+	.detect = dummy_encoder_slave_detect,
+	.get_modes = dummy_encoder_slave_get_modes,
+	.create_resources = dummy_encoder_slave_create_resources,
+	.set_property = dummy_encoder_set_property,
+};
+
+/* I2C driver functions */
+
+static int dummy_encoder_init(struct i2c_client *client,
+				struct drm_device *dev,
+				struct drm_encoder_slave *encoder_slave)
+{
+	struct dummy_priv *priv;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->encoder = &encoder_slave->base;
+
+	encoder_slave->slave_priv = priv;
+	encoder_slave->slave_funcs = &dummy_encoder_slave_funcs;
+
+	return 0;
+}
+
+struct dummy_priv2 {
+	struct dummy_priv base;
+	struct drm_encoder encoder;
+	struct drm_connector connector;
+};
+
+#define conn_to_dummy_priv2(x) \
+	container_of(x, struct dummy_priv2, connector);
+
+#define enc_to_dummy_priv2(x) \
+	container_of(x, struct dummy_priv2, encoder);
+
+static void dummy_encoder2_dpms(struct drm_encoder *encoder, int mode)
+{
+	struct dummy_priv2 *priv = enc_to_dummy_priv2(encoder);
+
+	dummy_encoder_dpms(&priv->base, mode);
+}
+
+static void dummy_encoder_prepare(struct drm_encoder *encoder)
+{
+	dummy_encoder2_dpms(encoder, DRM_MODE_DPMS_OFF);
+}
+
+static void dummy_encoder_commit(struct drm_encoder *encoder)
+{
+	dummy_encoder2_dpms(encoder, DRM_MODE_DPMS_ON);
+}
+
+static void dummy_encoder2_mode_set(struct drm_encoder *encoder,
+				      struct drm_display_mode *mode,
+				      struct drm_display_mode *adjusted_mode)
+{
+	struct dummy_priv2 *priv = enc_to_dummy_priv2(encoder);
+
+	dummy_encoder_mode_set(&priv->base, mode, adjusted_mode);
+}
+
+static const struct drm_encoder_helper_funcs dummy_encoder_helper_funcs = {
+	.dpms = dummy_encoder2_dpms,
+	.save = dummy_encoder_save,
+	.restore = dummy_encoder_restore,
+	.mode_fixup = dummy_encoder_mode_fixup,
+	.prepare = dummy_encoder_prepare,
+	.commit = dummy_encoder_commit,
+	.mode_set = dummy_encoder2_mode_set,
+};
+
+static void dummy_encoder_destroy(struct drm_encoder *encoder)
+{
+	struct dummy_priv2 *priv = enc_to_dummy_priv2(encoder);
+
+	dummy_destroy(&priv->base);
+	drm_encoder_cleanup(encoder);
+}
+
+static const struct drm_encoder_funcs dummy_encoder_funcs = {
+	.destroy = dummy_encoder_destroy,
+};
+
+static int dummy_connector_get_modes(struct drm_connector *connector)
+{
+	struct dummy_priv2 *priv = conn_to_dummy_priv2(connector);
+
+	return dummy_encoder_get_modes(&priv->base, connector);
+}
+
+static int dummy_connector_mode_valid(struct drm_connector *connector,
+					struct drm_display_mode *mode)
+{
+	struct dummy_priv2 *priv = conn_to_dummy_priv2(connector);
+
+	return dummy_encoder_mode_valid(&priv->base, mode);
+}
+
+static struct drm_encoder *
+dummy_connector_best_encoder(struct drm_connector *connector)
+{
+	struct dummy_priv2 *priv = conn_to_dummy_priv2(connector);
+
+	return &priv->encoder;
+}
+
+static
+const struct drm_connector_helper_funcs dummy_connector_helper_funcs = {
+	.get_modes = dummy_connector_get_modes,
+	.mode_valid = dummy_connector_mode_valid,
+	.best_encoder = dummy_connector_best_encoder,
+};
+
+static enum drm_connector_status
+dummy_connector_detect(struct drm_connector *connector, bool force)
+{
+	struct dummy_priv2 *priv = conn_to_dummy_priv2(connector);
+
+	return dummy_encoder_detect(&priv->base);
+}
+
+static void dummy_connector_destroy(struct drm_connector *connector)
+{
+	drm_connector_unregister(connector);
+	drm_connector_cleanup(connector);
+}
+
+static const struct drm_connector_funcs dummy_connector_funcs = {
+	.dpms = drm_helper_connector_dpms,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.detect = dummy_connector_detect,
+	.destroy = dummy_connector_destroy,
+};
+
+static int dummy_bind(struct device *dev, struct device *master, void *data)
+{
+	struct drm_device *drm = data;
+	struct dummy_priv2 *priv;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	dev_set_drvdata(dev, priv);
+
+	priv->base.encoder = &priv->encoder;
+	priv->encoder.possible_crtcs = 1 << 0;
+
+	drm_encoder_helper_add(&priv->encoder, &dummy_encoder_helper_funcs);
+	ret = drm_encoder_init(drm, &priv->encoder, &dummy_encoder_funcs,
+			       DRM_MODE_ENCODER_TMDS);
+	if (ret)
+		goto err_encoder;
+
+	drm_connector_helper_add(&priv->connector,
+				 &dummy_connector_helper_funcs);
+	ret = drm_connector_init(drm, &priv->connector,
+				 &dummy_connector_funcs,
+				 DRM_MODE_CONNECTOR_HDMIA);
+	if (ret)
+		goto err_connector;
+
+	ret = drm_connector_register(&priv->connector);
+	if (ret)
+		goto err_sysfs;
+
+	priv->connector.encoder = &priv->encoder;
+	drm_mode_connector_attach_encoder(&priv->connector, &priv->encoder);
+
+	return 0;
+
+err_sysfs:
+	drm_connector_cleanup(&priv->connector);
+err_connector:
+	drm_encoder_cleanup(&priv->encoder);
+err_encoder:
+	dummy_destroy(&priv->base);
+	return ret;
+}
+
+static void dummy_unbind(struct device *dev, struct device *master,
+			   void *data)
+{
+	struct dummy_priv2 *priv = dev_get_drvdata(dev);
+
+	drm_connector_cleanup(&priv->connector);
+	drm_encoder_cleanup(&priv->encoder);
+	dummy_destroy(&priv->base);
+}
+
+static const struct component_ops dummy_ops = {
+	.bind = dummy_bind,
+	.unbind = dummy_unbind,
+};
+
+static int
+dummy_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+	return component_add(&client->dev, &dummy_ops);
+}
+
+static int dummy_remove(struct i2c_client *client)
+{
+	component_del(&client->dev, &dummy_ops);
+	return 0;
+}
+
+static const struct of_device_id dummy_of_ids[] = {
+	{ .compatible = "sil,sii9022-tpi", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, dummy_of_ids);
+
+static struct i2c_device_id dummy_ids[] = {
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, dummy_ids);
+
+static struct drm_i2c_encoder_driver dummy_driver = {
+	.i2c_driver = {
+		.probe = dummy_probe,
+		.remove = dummy_remove,
+		.driver = {
+			.name = "dummy_drm_i2c",
+			.of_match_table = dummy_of_ids
+		},
+		.id_table = dummy_ids,
+	},
+	.encoder_init = dummy_encoder_init,
+};
+
+/* Module initialization */
+
+static int __init
+dummy_init(void)
+{
+	return drm_i2c_encoder_register(THIS_MODULE, &dummy_driver);
+}
+
+static void __exit
+dummy_exit(void)
+{
+	drm_i2c_encoder_unregister(&dummy_driver);
+}
+
+MODULE_LICENSE("GPL");
+
+module_init(dummy_init);
+module_exit(dummy_exit);
diff --git a/linaro/configs/vexpress.conf b/linaro/configs/vexpress.conf
index 266102b531a3..ba84a4001dea 100644
--- a/linaro/configs/vexpress.conf
+++ b/linaro/configs/vexpress.conf
@@ -35,7 +35,13 @@ CONFIG_SERIAL_AMBA_PL011=y
 CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
 CONFIG_FB=y
 CONFIG_FB_ARMCLCD=y
-CONFIG_FB_ARMHDLCD=y
+CONFIG_DRM=y
+CONFIG_DRM_ARM=y
+CONFIG_DRM_HDLCD=y
+CONFIG_CMA=y
+CONFIG_CMA_SIZE_MBYTES=32
+CONFIG_I2C_VERSATILE=y
+CONFIG_DRM_I2C_DUMMY=y
 CONFIG_LOGO=y
 # CONFIG_LOGO_LINUX_MONO is not set
 # CONFIG_LOGO_LINUX_VGA16 is not set
diff --git a/linaro/configs/vexpress64.conf b/linaro/configs/vexpress64.conf
index 769f2cc86fff..1744a88ba417 100644
--- a/linaro/configs/vexpress64.conf
+++ b/linaro/configs/vexpress64.conf
@@ -85,3 +85,25 @@ CONFIG_PM_RUNTIME=y
 CONFIG_TEE=y
 CONFIG_OPTEE=y
 CONFIG_DEVMEM=y
+CONFIG_DRM=y
+CONFIG_DRM_ARM=y
+CONFIG_DRM_HDLCD=y
+CONFIG_DRM_VIRTUAL_HDLCD=y
+CONFIG_CMA=y
+CONFIG_CMA_SIZE_MBYTES=32
+CONFIG_DRM_I2C_NXP_TDA998X=y
+CONFIG_SOUND=y
+CONFIG_SND=y
+CONFIG_SND_SEQUENCER=y
+CONFIG_SND_SEQ_DUMMY=y
+CONFIG_SND_MIXER_OSS=y
+CONFIG_SND_PCM_OSS=y
+CONFIG_SND_SEQUENCER_OSS=y
+# CONFIG_SND_USB is not set
+CONFIG_SND_SOC=y
+CONFIG_SND_DESIGNWARE_I2S=y
+CONFIG_SND_SOC_HDMI_CODEC=y
+CONFIG_SND_SOC_SPDIF=y
+CONFIG_SND_SIMPLE_CARD=y
+CONFIG_DMADEVICES=y
+CONFIG_PL330_DMA=y