drivers/gpu/drm/omapdrm/omap_connector.c - arm/linux - Git at Google

 /*
  * drivers/gpu/drm/omapdrm/omap_connector.c
  *
  * Copyright (C) 2011 Texas Instruments
  * Author: Rob Clark <rob@ti.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 <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_crtc_helper.h>

 #include "omap_drv.h"

 /*
  * connector funcs
  */

 #define to_omap_connector(x) container_of(x, struct omap_connector, base)

 struct omap_connector {
 	struct drm_connector base;
 	struct omap_dss_device *dssdev;
 	bool hdmi_mode;
 };

 static void omap_connector_hpd_cb(void *cb_data,
 				  enum drm_connector_status status)
 {
 	struct omap_connector *omap_connector = cb_data;
 	struct drm_connector *connector = &omap_connector->base;
 	struct drm_device *dev = connector->dev;
 	enum drm_connector_status old_status;

 	mutex_lock(&dev->mode_config.mutex);
 	old_status = connector->status;
 	connector->status = status;
 	mutex_unlock(&dev->mode_config.mutex);

 	if (old_status != status)
 		drm_kms_helper_hotplug_event(dev);
 }

 bool omap_connector_get_hdmi_mode(struct drm_connector *connector)
 {
 	struct omap_connector *omap_connector = to_omap_connector(connector);

 	return omap_connector->hdmi_mode;
 }

 static enum drm_connector_status omap_connector_detect(
 		struct drm_connector *connector, bool force)
 {
 	struct omap_connector *omap_connector = to_omap_connector(connector);
 	struct omap_dss_device *dssdev = omap_connector->dssdev;
 	struct omap_dss_driver *dssdrv = dssdev->driver;
 	enum drm_connector_status ret;

 	if (dssdrv->detect) {
 		if (dssdrv->detect(dssdev))
 			ret = connector_status_connected;
 		else
 			ret = connector_status_disconnected;
 	} else if (dssdev->type == OMAP_DISPLAY_TYPE_DPI ||
 			dssdev->type == OMAP_DISPLAY_TYPE_DBI ||
 			dssdev->type == OMAP_DISPLAY_TYPE_SDI ||
 			dssdev->type == OMAP_DISPLAY_TYPE_DSI) {
 		ret = connector_status_connected;
 	} else {
 		ret = connector_status_unknown;
 	}

 	VERB("%s: %d (force=%d)", omap_connector->dssdev->name, ret, force);

 	return ret;
 }

 static void omap_connector_destroy(struct drm_connector *connector)
 {
 	struct omap_connector *omap_connector = to_omap_connector(connector);
 	struct omap_dss_device *dssdev = omap_connector->dssdev;

 	DBG("%s", omap_connector->dssdev->name);
 	if (connector->polled == DRM_CONNECTOR_POLL_HPD &&
 	    dssdev->driver->unregister_hpd_cb) {
 		dssdev->driver->unregister_hpd_cb(dssdev);
 	}
 	drm_connector_unregister(connector);
 	drm_connector_cleanup(connector);
 	kfree(omap_connector);

 	omap_dss_put_device(dssdev);
 }

 #define MAX_EDID  512

 static int omap_connector_get_modes(struct drm_connector *connector)
 {
 	struct omap_connector *omap_connector = to_omap_connector(connector);
 	struct omap_dss_device *dssdev = omap_connector->dssdev;
 	struct omap_dss_driver *dssdrv = dssdev->driver;
 	struct drm_device *dev = connector->dev;
 	int n = 0;

 	DBG("%s", omap_connector->dssdev->name);

 	/* if display exposes EDID, then we parse that in the normal way to
 	 * build table of supported modes.. otherwise (ie. fixed resolution
 	 * LCD panels) we just return a single mode corresponding to the
 	 * currently configured timings:
 	 */
 	if (dssdrv->read_edid) {
 		void *edid = kzalloc(MAX_EDID, GFP_KERNEL);

 		if ((dssdrv->read_edid(dssdev, edid, MAX_EDID) > 0) &&
 				drm_edid_is_valid(edid)) {
 			drm_mode_connector_update_edid_property(
 					connector, edid);
 			n = drm_add_edid_modes(connector, edid);

 			omap_connector->hdmi_mode =
 				drm_detect_hdmi_monitor(edid);
 		} else {
 			drm_mode_connector_update_edid_property(
 					connector, NULL);
 		}

 		kfree(edid);
 	} else {
 		struct drm_display_mode *mode = drm_mode_create(dev);
 		struct videomode vm = {0};

 		dssdrv->get_timings(dssdev, &vm);

 		drm_display_mode_from_videomode(&vm, mode);

 		mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 		drm_mode_set_name(mode);
 		drm_mode_probed_add(connector, mode);

 		n = 1;
 	}

 	return n;
 }

 static int omap_connector_mode_valid(struct drm_connector *connector,
 				 struct drm_display_mode *mode)
 {
 	struct omap_connector *omap_connector = to_omap_connector(connector);
 	struct omap_dss_device *dssdev = omap_connector->dssdev;
 	struct omap_dss_driver *dssdrv = dssdev->driver;
 	struct videomode vm = {0};
 	struct drm_device *dev = connector->dev;
 	struct drm_display_mode *new_mode;
 	int r, ret = MODE_BAD;

 	drm_display_mode_to_videomode(mode, &vm);
 	mode->vrefresh = drm_mode_vrefresh(mode);

 	/*
 	 * if the panel driver doesn't have a check_timings, it's most likely
 	 * a fixed resolution panel, check if the timings match with the
 	 * panel's timings
 	 */
 	if (dssdrv->check_timings) {
 		r = dssdrv->check_timings(dssdev, &vm);
 	} else {
 		struct videomode t = {0};

 		dssdrv->get_timings(dssdev, &t);

 		/*
 		 * Ignore the flags, as we don't get them from
 		 * drm_display_mode_to_videomode.
 		 */
 		t.flags = 0;

 		if (memcmp(&vm, &t, sizeof(vm)))
 			r = -EINVAL;
 		else
 			r = 0;
 	}

 	if (!r) {
 		/* check if vrefresh is still valid */
 		new_mode = drm_mode_duplicate(dev, mode);
 		new_mode->clock = vm.pixelclock / 1000;
 		new_mode->vrefresh = 0;
 		if (mode->vrefresh == drm_mode_vrefresh(new_mode))
 			ret = MODE_OK;
 		drm_mode_destroy(dev, new_mode);
 	}

 	DBG("connector: mode %s: "
 			"%d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
 			(ret == MODE_OK) ? "valid" : "invalid",
 			mode->base.id, mode->name, mode->vrefresh, mode->clock,
 			mode->hdisplay, mode->hsync_start,
 			mode->hsync_end, mode->htotal,
 			mode->vdisplay, mode->vsync_start,
 			mode->vsync_end, mode->vtotal, mode->type, mode->flags);

 	return ret;
 }

 static const struct drm_connector_funcs omap_connector_funcs = {
 	.reset = drm_atomic_helper_connector_reset,
 	.detect = omap_connector_detect,
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.destroy = omap_connector_destroy,
 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };

 static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
 	.get_modes = omap_connector_get_modes,
 	.mode_valid = omap_connector_mode_valid,
 };

 /* initialize connector */
 struct drm_connector *omap_connector_init(struct drm_device *dev,
 		int connector_type, struct omap_dss_device *dssdev,
 		struct drm_encoder *encoder)
 {
 	struct drm_connector *connector = NULL;
 	struct omap_connector *omap_connector;
 	bool hpd_supported = false;

 	DBG("%s", dssdev->name);

 	omap_dss_get_device(dssdev);

 	omap_connector = kzalloc(sizeof(*omap_connector), GFP_KERNEL);
 	if (!omap_connector)
 		goto fail;

 	omap_connector->dssdev = dssdev;

 	connector = &omap_connector->base;

 	drm_connector_init(dev, connector, &omap_connector_funcs,
 				connector_type);
 	drm_connector_helper_add(connector, &omap_connector_helper_funcs);

 	if (dssdev->driver->register_hpd_cb) {
 		int ret = dssdev->driver->register_hpd_cb(dssdev,
 							  omap_connector_hpd_cb,
 							  omap_connector);
 		if (!ret)
 			hpd_supported = true;
 		else if (ret != -ENOTSUPP)
 			DBG("%s: Failed to register HPD callback (%d).",
 			    dssdev->name, ret);
 	}

 	if (hpd_supported)
 		connector->polled = DRM_CONNECTOR_POLL_HPD;
 	else if (dssdev->driver->detect)
 		connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 				    DRM_CONNECTOR_POLL_DISCONNECT;
 	else
 		connector->polled = 0;

 	connector->interlace_allowed = 1;
 	connector->doublescan_allowed = 0;

 	return connector;

 fail:
 	if (connector)
 		omap_connector_destroy(connector);

 	return NULL;
 }
	/*
	* drivers/gpu/drm/omapdrm/omap_connector.c
	*
	* Copyright (C) 2011 Texas Instruments
	* Author: Rob Clark <rob@ti.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 <drm/drm_atomic_helper.h>
	#include <drm/drm_crtc.h>
	#include <drm/drm_crtc_helper.h>

	#include "omap_drv.h"

	/*
	* connector funcs
	*/

	#define to_omap_connector(x) container_of(x, struct omap_connector, base)

	struct omap_connector {
	struct drm_connector base;
	struct omap_dss_device *dssdev;
	bool hdmi_mode;
	};

	static void omap_connector_hpd_cb(void *cb_data,
	enum drm_connector_status status)
	{
	struct omap_connector *omap_connector = cb_data;
	struct drm_connector *connector = &omap_connector->base;
	struct drm_device *dev = connector->dev;
	enum drm_connector_status old_status;

	mutex_lock(&dev->mode_config.mutex);
	old_status = connector->status;
	connector->status = status;
	mutex_unlock(&dev->mode_config.mutex);

	if (old_status != status)
	drm_kms_helper_hotplug_event(dev);
	}

	bool omap_connector_get_hdmi_mode(struct drm_connector *connector)
	{
	struct omap_connector *omap_connector = to_omap_connector(connector);

	return omap_connector->hdmi_mode;
	}

	static enum drm_connector_status omap_connector_detect(
	struct drm_connector *connector, bool force)
	{
	struct omap_connector *omap_connector = to_omap_connector(connector);
	struct omap_dss_device *dssdev = omap_connector->dssdev;
	struct omap_dss_driver *dssdrv = dssdev->driver;
	enum drm_connector_status ret;

	if (dssdrv->detect) {
	if (dssdrv->detect(dssdev))
	ret = connector_status_connected;
	else
	ret = connector_status_disconnected;
	} else if (dssdev->type == OMAP_DISPLAY_TYPE_DPI \|\|
	dssdev->type == OMAP_DISPLAY_TYPE_DBI \|\|
	dssdev->type == OMAP_DISPLAY_TYPE_SDI \|\|
	dssdev->type == OMAP_DISPLAY_TYPE_DSI) {
	ret = connector_status_connected;
	} else {
	ret = connector_status_unknown;
	}

	VERB("%s: %d (force=%d)", omap_connector->dssdev->name, ret, force);

	return ret;
	}

	static void omap_connector_destroy(struct drm_connector *connector)
	{
	struct omap_connector *omap_connector = to_omap_connector(connector);
	struct omap_dss_device *dssdev = omap_connector->dssdev;

	DBG("%s", omap_connector->dssdev->name);
	if (connector->polled == DRM_CONNECTOR_POLL_HPD &&
	dssdev->driver->unregister_hpd_cb) {
	dssdev->driver->unregister_hpd_cb(dssdev);
	}
	drm_connector_unregister(connector);
	drm_connector_cleanup(connector);
	kfree(omap_connector);

	omap_dss_put_device(dssdev);
	}

	#define MAX_EDID 512

	static int omap_connector_get_modes(struct drm_connector *connector)
	{
	struct omap_connector *omap_connector = to_omap_connector(connector);
	struct omap_dss_device *dssdev = omap_connector->dssdev;
	struct omap_dss_driver *dssdrv = dssdev->driver;
	struct drm_device *dev = connector->dev;
	int n = 0;

	DBG("%s", omap_connector->dssdev->name);

	/* if display exposes EDID, then we parse that in the normal way to
	* build table of supported modes.. otherwise (ie. fixed resolution
	* LCD panels) we just return a single mode corresponding to the
	* currently configured timings:
	*/
	if (dssdrv->read_edid) {
	void *edid = kzalloc(MAX_EDID, GFP_KERNEL);

	if ((dssdrv->read_edid(dssdev, edid, MAX_EDID) > 0) &&
	drm_edid_is_valid(edid)) {
	drm_mode_connector_update_edid_property(
	connector, edid);
	n = drm_add_edid_modes(connector, edid);

	omap_connector->hdmi_mode =
	drm_detect_hdmi_monitor(edid);
	} else {
	drm_mode_connector_update_edid_property(
	connector, NULL);
	}

	kfree(edid);
	} else {
	struct drm_display_mode *mode = drm_mode_create(dev);
	struct videomode vm = {0};

	dssdrv->get_timings(dssdev, &vm);

	drm_display_mode_from_videomode(&vm, mode);

	mode->type = DRM_MODE_TYPE_DRIVER \| DRM_MODE_TYPE_PREFERRED;
	drm_mode_set_name(mode);
	drm_mode_probed_add(connector, mode);

	n = 1;
	}

	return n;
	}

	static int omap_connector_mode_valid(struct drm_connector *connector,
	struct drm_display_mode *mode)
	{
	struct omap_connector *omap_connector = to_omap_connector(connector);
	struct omap_dss_device *dssdev = omap_connector->dssdev;
	struct omap_dss_driver *dssdrv = dssdev->driver;
	struct videomode vm = {0};
	struct drm_device *dev = connector->dev;
	struct drm_display_mode *new_mode;
	int r, ret = MODE_BAD;

	drm_display_mode_to_videomode(mode, &vm);
	mode->vrefresh = drm_mode_vrefresh(mode);

	/*
	* if the panel driver doesn't have a check_timings, it's most likely
	* a fixed resolution panel, check if the timings match with the
	* panel's timings
	*/
	if (dssdrv->check_timings) {
	r = dssdrv->check_timings(dssdev, &vm);
	} else {
	struct videomode t = {0};

	dssdrv->get_timings(dssdev, &t);

	/*
	* Ignore the flags, as we don't get them from
	* drm_display_mode_to_videomode.
	*/
	t.flags = 0;

	if (memcmp(&vm, &t, sizeof(vm)))
	r = -EINVAL;
	else
	r = 0;
	}

	if (!r) {
	/* check if vrefresh is still valid */
	new_mode = drm_mode_duplicate(dev, mode);
	new_mode->clock = vm.pixelclock / 1000;
	new_mode->vrefresh = 0;
	if (mode->vrefresh == drm_mode_vrefresh(new_mode))
	ret = MODE_OK;
	drm_mode_destroy(dev, new_mode);
	}

	DBG("connector: mode %s: "
	"%d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
	(ret == MODE_OK) ? "valid" : "invalid",
	mode->base.id, mode->name, mode->vrefresh, mode->clock,
	mode->hdisplay, mode->hsync_start,
	mode->hsync_end, mode->htotal,
	mode->vdisplay, mode->vsync_start,
	mode->vsync_end, mode->vtotal, mode->type, mode->flags);

	return ret;
	}

	static const struct drm_connector_funcs omap_connector_funcs = {
	.reset = drm_atomic_helper_connector_reset,
	.detect = omap_connector_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = omap_connector_destroy,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
	};

	static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
	.get_modes = omap_connector_get_modes,
	.mode_valid = omap_connector_mode_valid,
	};

	/* initialize connector */
	struct drm_connector omap_connector_init(struct drm_device dev,
	int connector_type, struct omap_dss_device *dssdev,
	struct drm_encoder *encoder)
	{
	struct drm_connector *connector = NULL;
	struct omap_connector *omap_connector;
	bool hpd_supported = false;

	DBG("%s", dssdev->name);

	omap_dss_get_device(dssdev);

	omap_connector = kzalloc(sizeof(*omap_connector), GFP_KERNEL);
	if (!omap_connector)
	goto fail;

	omap_connector->dssdev = dssdev;

	connector = &omap_connector->base;

	drm_connector_init(dev, connector, &omap_connector_funcs,
	connector_type);
	drm_connector_helper_add(connector, &omap_connector_helper_funcs);

	if (dssdev->driver->register_hpd_cb) {
	int ret = dssdev->driver->register_hpd_cb(dssdev,
	omap_connector_hpd_cb,
	omap_connector);
	if (!ret)
	hpd_supported = true;
	else if (ret != -ENOTSUPP)
	DBG("%s: Failed to register HPD callback (%d).",
	dssdev->name, ret);
	}

	if (hpd_supported)
	connector->polled = DRM_CONNECTOR_POLL_HPD;
	else if (dssdev->driver->detect)
	connector->polled = DRM_CONNECTOR_POLL_CONNECT \|
	DRM_CONNECTOR_POLL_DISCONNECT;
	else
	connector->polled = 0;

	connector->interlace_allowed = 1;
	connector->doublescan_allowed = 0;

	return connector;

	fail:
	if (connector)
	omap_connector_destroy(connector);

	return NULL;
	}