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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.
*
*/
/*
* Theory of operation:
*
* The DRM framework expects the CRTC -> Encoder -> Connector chain,
* where the CRTC is reading from framebuffer, passes data to the
* encoder and that formats the signals to something usable by the
* attached connector(s). Connectors can use i2c links to talk with
* attached monitors.
*
* The HDMI transmitter is a different beast: it is both and encoder
* and a connector in DRM parlance *and* can only be reached via i2c.
* It implements an i2c pass through mode for the situation where one
* wants to talk with the attached monitor. To complicate things
* even further, the VExpress boards that have the SiI9022 chip share
* the i2c line between the on-board microcontroller and the CoreTiles.
* This leads to a situation where the microcontroller might be able to
* talk with the SiI9022 transmitter, but not the CoreTile. And the
* micro has a very small brain and a list of hardcoded modes that
* it can program into the HDMI transmitter, so only a limited set
* of resolutions will be valid.
*
* This file handles only the case where the i2c connection is available
* to the kernel. For the case where we have to ask the microcontroller
* to do the modesetting for us see the hdlcd_vexpress_encoder.c file.
*/
#include <linux/i2c.h>
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_encoder_slave.h>
#include <drm/i2c/tda998x.h>
#include <video/display_timing.h>
#include <video/of_display_timing.h>
#include <video/videomode.h>
#include "hdlcd_drv.h"
static inline struct drm_encoder_slave *
hdlcd_get_slave_encoder(struct drm_connector * connector)
{
return to_encoder_slave(hdlcd_connector_best_encoder(connector));
}
static void hdlcd_connector_destroy(struct drm_connector *connector)
{
}
static enum drm_connector_status
hdlcd_connector_detect(struct drm_connector *connector, bool force)
{
struct drm_encoder_slave *slave;
if (!connector->encoder)
connector->encoder = hdlcd_connector_best_encoder(connector);
slave = hdlcd_get_slave_encoder(connector);
if (!slave || !slave->slave_funcs)
return connector_status_unknown;
return slave->slave_funcs->detect(connector->encoder, connector);
}
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,
};
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_hdmi_con_get_modes(struct drm_connector *connector)
{
struct drm_encoder_slave *slave = hdlcd_get_slave_encoder(connector);
if (slave && slave->slave_funcs)
return slave->slave_funcs->get_modes(&slave->base, connector);
return 0;
}
static int hdlcd_hdmi_con_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
struct drm_encoder_slave *slave = hdlcd_get_slave_encoder(connector);
if (slave && slave->slave_funcs)
return slave->slave_funcs->mode_valid(connector->encoder, mode);
return MODE_ERROR;
}
static const struct drm_connector_helper_funcs hdlcd_hdmi_con_helper_funcs = {
.get_modes = hdlcd_hdmi_con_get_modes,
.mode_valid = hdlcd_hdmi_con_mode_valid,
.best_encoder = hdlcd_connector_best_encoder,
};
static struct drm_encoder_funcs hdlcd_encoder_funcs = {
.destroy = drm_i2c_encoder_destroy,
};
static void hdlcd_hdmi_encoder_disable(struct drm_encoder *encoder)
{
drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
}
static struct drm_encoder_helper_funcs hdlcd_encoder_helper_funcs = {
.dpms = drm_i2c_encoder_dpms,
.save = drm_i2c_encoder_save,
.restore = drm_i2c_encoder_restore,
.mode_fixup = drm_i2c_encoder_mode_fixup,
.prepare = drm_i2c_encoder_prepare,
.commit = drm_i2c_encoder_commit,
.mode_set = drm_i2c_encoder_mode_set,
.detect = drm_i2c_encoder_detect,
.disable = hdlcd_hdmi_encoder_disable,
};
static struct tda998x_encoder_params tda998x_params = {
.swap_a = 2,
.swap_b = 3,
.swap_c = 4,
.swap_d = 5,
.swap_e = 0,
.swap_f = 1,
};
int hdlcd_create_digital_connector(struct drm_device *dev,
struct hdlcd_drm_private *hdlcd)
{
int err;
struct i2c_board_info i2c_info;
struct drm_encoder_slave *slave;
struct drm_connector *connector;
struct device_node *node = hdlcd->slave_node;
slave = kzalloc(sizeof(*slave), GFP_KERNEL);
if (!slave)
return -ENOMEM;
slave->base.possible_crtcs = 1;
slave->base.possible_clones = 0;
err = drm_encoder_init(dev, &slave->base, &hdlcd_encoder_funcs,
DRM_MODE_ENCODER_TMDS);
if (err)
goto encoder_init_err;
drm_encoder_helper_add(&slave->base, &hdlcd_encoder_helper_funcs);
/* get the driver for the i2c slave node */
i2c_info.of_node = node;
err = of_modalias_node(node, i2c_info.type, sizeof(i2c_info.type));
if (err < 0) {
dev_err(dev->dev, "failed to get a module alias for node %s\n",
node->full_name);
}
/* Hack: this needs to be specified in the device tree */
i2c_info.platform_data = &tda998x_params;
err = drm_i2c_encoder_init(dev, slave, NULL, &i2c_info);
of_node_put(node);
if (err)
goto connector_alloc_err;
connector = kzalloc(sizeof(*connector), GFP_KERNEL);
if (!connector) {
err = -ENOMEM;
goto connector_alloc_err;
}
connector->interlace_allowed = false;
connector->doublescan_allowed = false;
connector->polled = DRM_CONNECTOR_POLL_CONNECT |
DRM_CONNECTOR_POLL_DISCONNECT;
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_hdmi_con_helper_funcs);
connector->encoder = &slave->base;
err = drm_mode_connector_attach_encoder(connector, &slave->base);
if (err) {
goto connector_attach_err;
}
drm_sysfs_connector_add(connector);
slave->base.dev->dev->platform_data = hdlcd;
return err;
connector_attach_err:
drm_connector_cleanup(connector);
connector_init_err:
kfree(connector);
connector_alloc_err:
drm_encoder_cleanup(&slave->base);
encoder_init_err:
kfree(slave);
return err;
}
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