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/*
* 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)
{
int i, vrefresh = drm_mode_vrefresh(mode);
if (vconfig_func) {
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) {
dev_err(dev->dev, "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;
}
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