drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c - kernel/bruno - Git at Google

 /*
  * Copyright (C) 2014 Traphandler
  * Copyright (C) 2014 Free Electrons
  * Copyright (C) 2014 Atmel
  *
  * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
  * Author: Boris BREZILLON <boris.brezillon@free-electrons.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/of_graph.h>

 #include <drm/drmP.h>
 #include <drm/drm_panel.h>

 #include "atmel_hlcdc_dc.h"

 /**
  * Atmel HLCDC RGB output mode
  */
 enum atmel_hlcdc_connector_rgb_mode {
 	ATMEL_HLCDC_CONNECTOR_RGB444,
 	ATMEL_HLCDC_CONNECTOR_RGB565,
 	ATMEL_HLCDC_CONNECTOR_RGB666,
 	ATMEL_HLCDC_CONNECTOR_RGB888,
 };

 /**
  * Atmel HLCDC RGB connector structure
  *
  * This structure stores RGB slave device information.
  *
  * @connector: DRM connector
  * @encoder: DRM encoder
  * @dc: pointer to the atmel_hlcdc_dc structure
  * @dpms: current DPMS mode
  */
 struct atmel_hlcdc_rgb_output {
 	struct drm_connector connector;
 	struct drm_encoder encoder;
 	struct atmel_hlcdc_dc *dc;
 	int dpms;
 };

 static inline struct atmel_hlcdc_rgb_output *
 drm_connector_to_atmel_hlcdc_rgb_output(struct drm_connector *connector)
 {
 	return container_of(connector, struct atmel_hlcdc_rgb_output,
 			    connector);
 }

 static inline struct atmel_hlcdc_rgb_output *
 drm_encoder_to_atmel_hlcdc_rgb_output(struct drm_encoder *encoder)
 {
 	return container_of(encoder, struct atmel_hlcdc_rgb_output, encoder);
 }

 /**
  * Atmel HLCDC Panel device structure
  *
  * This structure is specialization of the slave device structure to
  * interface with drm panels.
  *
  * @base: base slave device fields
  * @panel: drm panel attached to this slave device
  */
 struct atmel_hlcdc_panel {
 	struct atmel_hlcdc_rgb_output base;
 	struct drm_panel *panel;
 };

 static inline struct atmel_hlcdc_panel *
 atmel_hlcdc_rgb_output_to_panel(struct atmel_hlcdc_rgb_output *output)
 {
 	return container_of(output, struct atmel_hlcdc_panel, base);
 }

 static void atmel_hlcdc_panel_encoder_enable(struct drm_encoder *encoder)
 {
 	struct atmel_hlcdc_rgb_output *rgb =
 			drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
 	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);

 	drm_panel_enable(panel->panel);
 }

 static void atmel_hlcdc_panel_encoder_disable(struct drm_encoder *encoder)
 {
 	struct atmel_hlcdc_rgb_output *rgb =
 			drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
 	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);

 	drm_panel_disable(panel->panel);
 }

 static bool
 atmel_hlcdc_panel_encoder_mode_fixup(struct drm_encoder *encoder,
 				     const struct drm_display_mode *mode,
 				     struct drm_display_mode *adjusted)
 {
 	return true;
 }

 static void
 atmel_hlcdc_rgb_encoder_mode_set(struct drm_encoder *encoder,
 				 struct drm_display_mode *mode,
 				 struct drm_display_mode *adjusted)
 {
 	struct atmel_hlcdc_rgb_output *rgb =
 			drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
 	struct drm_display_info *info = &rgb->connector.display_info;
 	unsigned int cfg;

 	cfg = 0;

 	if (info->num_bus_formats) {
 		switch (info->bus_formats[0]) {
 		case MEDIA_BUS_FMT_RGB565_1X16:
 			cfg |= ATMEL_HLCDC_CONNECTOR_RGB565 << 8;
 			break;
 		case MEDIA_BUS_FMT_RGB666_1X18:
 			cfg |= ATMEL_HLCDC_CONNECTOR_RGB666 << 8;
 			break;
 		case MEDIA_BUS_FMT_RGB888_1X24:
 			cfg |= ATMEL_HLCDC_CONNECTOR_RGB888 << 8;
 			break;
 		case MEDIA_BUS_FMT_RGB444_1X12:
 		default:
 			break;
 		}
 	}

 	regmap_update_bits(rgb->dc->hlcdc->regmap, ATMEL_HLCDC_CFG(5),
 			   ATMEL_HLCDC_MODE_MASK,
 			   cfg);
 }

 static struct drm_encoder_helper_funcs atmel_hlcdc_panel_encoder_helper_funcs = {
 	.mode_fixup = atmel_hlcdc_panel_encoder_mode_fixup,
 	.mode_set = atmel_hlcdc_rgb_encoder_mode_set,
 	.disable = atmel_hlcdc_panel_encoder_disable,
 	.enable = atmel_hlcdc_panel_encoder_enable,
 };

 static void atmel_hlcdc_rgb_encoder_destroy(struct drm_encoder *encoder)
 {
 	drm_encoder_cleanup(encoder);
 	memset(encoder, 0, sizeof(*encoder));
 }

 static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = {
 	.destroy = atmel_hlcdc_rgb_encoder_destroy,
 };

 static int atmel_hlcdc_panel_get_modes(struct drm_connector *connector)
 {
 	struct atmel_hlcdc_rgb_output *rgb =
 			drm_connector_to_atmel_hlcdc_rgb_output(connector);
 	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);

 	return panel->panel->funcs->get_modes(panel->panel);
 }

 static int atmel_hlcdc_rgb_mode_valid(struct drm_connector *connector,
 				      struct drm_display_mode *mode)
 {
 	struct atmel_hlcdc_rgb_output *rgb =
 			drm_connector_to_atmel_hlcdc_rgb_output(connector);

 	return atmel_hlcdc_dc_mode_valid(rgb->dc, mode);
 }


 static struct drm_encoder *
 atmel_hlcdc_rgb_best_encoder(struct drm_connector *connector)
 {
 	struct atmel_hlcdc_rgb_output *rgb =
 			drm_connector_to_atmel_hlcdc_rgb_output(connector);

 	return &rgb->encoder;
 }

 static struct drm_connector_helper_funcs atmel_hlcdc_panel_connector_helper_funcs = {
 	.get_modes = atmel_hlcdc_panel_get_modes,
 	.mode_valid = atmel_hlcdc_rgb_mode_valid,
 	.best_encoder = atmel_hlcdc_rgb_best_encoder,
 };

 static enum drm_connector_status
 atmel_hlcdc_panel_connector_detect(struct drm_connector *connector, bool force)
 {
 	return connector_status_connected;
 }

 static void
 atmel_hlcdc_panel_connector_destroy(struct drm_connector *connector)
 {
 	struct atmel_hlcdc_rgb_output *rgb =
 			drm_connector_to_atmel_hlcdc_rgb_output(connector);
 	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);

 	drm_panel_detach(panel->panel);
 	drm_connector_cleanup(connector);
 }

 static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
 	.dpms = drm_atomic_helper_connector_dpms,
 	.detect = atmel_hlcdc_panel_connector_detect,
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.destroy = atmel_hlcdc_panel_connector_destroy,
 	.reset = drm_atomic_helper_connector_reset,
 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };

 static int atmel_hlcdc_create_panel_output(struct drm_device *dev,
 					   struct of_endpoint *ep)
 {
 	struct atmel_hlcdc_dc *dc = dev->dev_private;
 	struct device_node *np;
 	struct drm_panel *p = NULL;
 	struct atmel_hlcdc_panel *panel;
 	int ret;

 	np = of_graph_get_remote_port_parent(ep->local_node);
 	if (!np)
 		return -EINVAL;

 	p = of_drm_find_panel(np);
 	of_node_put(np);

 	if (!p)
 		return -EPROBE_DEFER;

 	panel = devm_kzalloc(dev->dev, sizeof(*panel), GFP_KERNEL);
 	if (!panel)
 		return -EINVAL;

 	panel->base.dpms = DRM_MODE_DPMS_OFF;

 	panel->base.dc = dc;

 	drm_encoder_helper_add(&panel->base.encoder,
 			       &atmel_hlcdc_panel_encoder_helper_funcs);
 	ret = drm_encoder_init(dev, &panel->base.encoder,
 			       &atmel_hlcdc_panel_encoder_funcs,
 			       DRM_MODE_ENCODER_LVDS);
 	if (ret)
 		return ret;

 	panel->base.connector.dpms = DRM_MODE_DPMS_OFF;
 	panel->base.connector.polled = DRM_CONNECTOR_POLL_CONNECT;
 	drm_connector_helper_add(&panel->base.connector,
 				 &atmel_hlcdc_panel_connector_helper_funcs);
 	ret = drm_connector_init(dev, &panel->base.connector,
 				 &atmel_hlcdc_panel_connector_funcs,
 				 DRM_MODE_CONNECTOR_LVDS);
 	if (ret)
 		goto err_encoder_cleanup;

 	drm_mode_connector_attach_encoder(&panel->base.connector,
 					  &panel->base.encoder);
 	panel->base.encoder.possible_crtcs = 0x1;

 	drm_panel_attach(p, &panel->base.connector);
 	panel->panel = p;

 	return 0;

 err_encoder_cleanup:
 	drm_encoder_cleanup(&panel->base.encoder);

 	return ret;
 }

 int atmel_hlcdc_create_outputs(struct drm_device *dev)
 {
 	struct device_node *port_np, *np;
 	struct of_endpoint ep;
 	int ret;

 	port_np = of_get_child_by_name(dev->dev->of_node, "port");
 	if (!port_np)
 		return -EINVAL;

 	np = of_get_child_by_name(port_np, "endpoint");
 	of_node_put(port_np);

 	if (!np)
 		return -EINVAL;

 	ret = of_graph_parse_endpoint(np, &ep);
 	of_node_put(port_np);

 	if (ret)
 		return ret;

 	/* We currently only support panel output */
 	return atmel_hlcdc_create_panel_output(dev, &ep);
 }
	/*
	* Copyright (C) 2014 Traphandler
	* Copyright (C) 2014 Free Electrons
	* Copyright (C) 2014 Atmel
	*
	* Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
	* Author: Boris BREZILLON <boris.brezillon@free-electrons.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/of_graph.h>

	#include <drm/drmP.h>
	#include <drm/drm_panel.h>

	#include "atmel_hlcdc_dc.h"

	/**
	* Atmel HLCDC RGB output mode
	*/
	enum atmel_hlcdc_connector_rgb_mode {
	ATMEL_HLCDC_CONNECTOR_RGB444,
	ATMEL_HLCDC_CONNECTOR_RGB565,
	ATMEL_HLCDC_CONNECTOR_RGB666,
	ATMEL_HLCDC_CONNECTOR_RGB888,
	};

	/**
	* Atmel HLCDC RGB connector structure
	*
	* This structure stores RGB slave device information.
	*
	* @connector: DRM connector
	* @encoder: DRM encoder
	* @dc: pointer to the atmel_hlcdc_dc structure
	* @dpms: current DPMS mode
	*/
	struct atmel_hlcdc_rgb_output {
	struct drm_connector connector;
	struct drm_encoder encoder;
	struct atmel_hlcdc_dc *dc;
	int dpms;
	};

	static inline struct atmel_hlcdc_rgb_output *
	drm_connector_to_atmel_hlcdc_rgb_output(struct drm_connector *connector)
	{
	return container_of(connector, struct atmel_hlcdc_rgb_output,
	connector);
	}

	static inline struct atmel_hlcdc_rgb_output *
	drm_encoder_to_atmel_hlcdc_rgb_output(struct drm_encoder *encoder)
	{
	return container_of(encoder, struct atmel_hlcdc_rgb_output, encoder);
	}

	/**
	* Atmel HLCDC Panel device structure
	*
	* This structure is specialization of the slave device structure to
	* interface with drm panels.
	*
	* @base: base slave device fields
	* @panel: drm panel attached to this slave device
	*/
	struct atmel_hlcdc_panel {
	struct atmel_hlcdc_rgb_output base;
	struct drm_panel *panel;
	};

	static inline struct atmel_hlcdc_panel *
	atmel_hlcdc_rgb_output_to_panel(struct atmel_hlcdc_rgb_output *output)
	{
	return container_of(output, struct atmel_hlcdc_panel, base);
	}

	static void atmel_hlcdc_panel_encoder_enable(struct drm_encoder *encoder)
	{
	struct atmel_hlcdc_rgb_output *rgb =
	drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);

	drm_panel_enable(panel->panel);
	}

	static void atmel_hlcdc_panel_encoder_disable(struct drm_encoder *encoder)
	{
	struct atmel_hlcdc_rgb_output *rgb =
	drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);

	drm_panel_disable(panel->panel);
	}

	static bool
	atmel_hlcdc_panel_encoder_mode_fixup(struct drm_encoder *encoder,
	const struct drm_display_mode *mode,
	struct drm_display_mode *adjusted)
	{
	return true;
	}

	static void
	atmel_hlcdc_rgb_encoder_mode_set(struct drm_encoder *encoder,
	struct drm_display_mode *mode,
	struct drm_display_mode *adjusted)
	{
	struct atmel_hlcdc_rgb_output *rgb =
	drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
	struct drm_display_info *info = &rgb->connector.display_info;
	unsigned int cfg;

	cfg = 0;

	if (info->num_bus_formats) {
	switch (info->bus_formats[0]) {
	case MEDIA_BUS_FMT_RGB565_1X16:
	cfg \|= ATMEL_HLCDC_CONNECTOR_RGB565 << 8;
	break;
	case MEDIA_BUS_FMT_RGB666_1X18:
	cfg \|= ATMEL_HLCDC_CONNECTOR_RGB666 << 8;
	break;
	case MEDIA_BUS_FMT_RGB888_1X24:
	cfg \|= ATMEL_HLCDC_CONNECTOR_RGB888 << 8;
	break;
	case MEDIA_BUS_FMT_RGB444_1X12:
	default:
	break;
	}
	}

	regmap_update_bits(rgb->dc->hlcdc->regmap, ATMEL_HLCDC_CFG(5),
	ATMEL_HLCDC_MODE_MASK,
	cfg);
	}

	static struct drm_encoder_helper_funcs atmel_hlcdc_panel_encoder_helper_funcs = {
	.mode_fixup = atmel_hlcdc_panel_encoder_mode_fixup,
	.mode_set = atmel_hlcdc_rgb_encoder_mode_set,
	.disable = atmel_hlcdc_panel_encoder_disable,
	.enable = atmel_hlcdc_panel_encoder_enable,
	};

	static void atmel_hlcdc_rgb_encoder_destroy(struct drm_encoder *encoder)
	{
	drm_encoder_cleanup(encoder);
	memset(encoder, 0, sizeof(*encoder));
	}

	static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = {
	.destroy = atmel_hlcdc_rgb_encoder_destroy,
	};

	static int atmel_hlcdc_panel_get_modes(struct drm_connector *connector)
	{
	struct atmel_hlcdc_rgb_output *rgb =
	drm_connector_to_atmel_hlcdc_rgb_output(connector);
	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);

	return panel->panel->funcs->get_modes(panel->panel);
	}

	static int atmel_hlcdc_rgb_mode_valid(struct drm_connector *connector,
	struct drm_display_mode *mode)
	{
	struct atmel_hlcdc_rgb_output *rgb =
	drm_connector_to_atmel_hlcdc_rgb_output(connector);

	return atmel_hlcdc_dc_mode_valid(rgb->dc, mode);
	}



	static struct drm_encoder *
	atmel_hlcdc_rgb_best_encoder(struct drm_connector *connector)
	{
	struct atmel_hlcdc_rgb_output *rgb =
	drm_connector_to_atmel_hlcdc_rgb_output(connector);

	return &rgb->encoder;
	}

	static struct drm_connector_helper_funcs atmel_hlcdc_panel_connector_helper_funcs = {
	.get_modes = atmel_hlcdc_panel_get_modes,
	.mode_valid = atmel_hlcdc_rgb_mode_valid,
	.best_encoder = atmel_hlcdc_rgb_best_encoder,
	};

	static enum drm_connector_status
	atmel_hlcdc_panel_connector_detect(struct drm_connector *connector, bool force)
	{
	return connector_status_connected;
	}

	static void
	atmel_hlcdc_panel_connector_destroy(struct drm_connector *connector)
	{
	struct atmel_hlcdc_rgb_output *rgb =
	drm_connector_to_atmel_hlcdc_rgb_output(connector);
	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);

	drm_panel_detach(panel->panel);
	drm_connector_cleanup(connector);
	}

	static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
	.dpms = drm_atomic_helper_connector_dpms,
	.detect = atmel_hlcdc_panel_connector_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = atmel_hlcdc_panel_connector_destroy,
	.reset = drm_atomic_helper_connector_reset,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
	};

	static int atmel_hlcdc_create_panel_output(struct drm_device *dev,
	struct of_endpoint *ep)
	{
	struct atmel_hlcdc_dc *dc = dev->dev_private;
	struct device_node *np;
	struct drm_panel *p = NULL;
	struct atmel_hlcdc_panel *panel;
	int ret;

	np = of_graph_get_remote_port_parent(ep->local_node);
	if (!np)
	return -EINVAL;

	p = of_drm_find_panel(np);
	of_node_put(np);

	if (!p)
	return -EPROBE_DEFER;

	panel = devm_kzalloc(dev->dev, sizeof(*panel), GFP_KERNEL);
	if (!panel)
	return -EINVAL;

	panel->base.dpms = DRM_MODE_DPMS_OFF;

	panel->base.dc = dc;

	drm_encoder_helper_add(&panel->base.encoder,
	&atmel_hlcdc_panel_encoder_helper_funcs);
	ret = drm_encoder_init(dev, &panel->base.encoder,
	&atmel_hlcdc_panel_encoder_funcs,
	DRM_MODE_ENCODER_LVDS);
	if (ret)
	return ret;

	panel->base.connector.dpms = DRM_MODE_DPMS_OFF;
	panel->base.connector.polled = DRM_CONNECTOR_POLL_CONNECT;
	drm_connector_helper_add(&panel->base.connector,
	&atmel_hlcdc_panel_connector_helper_funcs);
	ret = drm_connector_init(dev, &panel->base.connector,
	&atmel_hlcdc_panel_connector_funcs,
	DRM_MODE_CONNECTOR_LVDS);
	if (ret)
	goto err_encoder_cleanup;

	drm_mode_connector_attach_encoder(&panel->base.connector,
	&panel->base.encoder);
	panel->base.encoder.possible_crtcs = 0x1;

	drm_panel_attach(p, &panel->base.connector);
	panel->panel = p;

	return 0;

	err_encoder_cleanup:
	drm_encoder_cleanup(&panel->base.encoder);

	return ret;
	}

	int atmel_hlcdc_create_outputs(struct drm_device *dev)
	{
	struct device_node port_np, np;
	struct of_endpoint ep;
	int ret;

	port_np = of_get_child_by_name(dev->dev->of_node, "port");
	if (!port_np)
	return -EINVAL;

	np = of_get_child_by_name(port_np, "endpoint");
	of_node_put(port_np);

	if (!np)
	return -EINVAL;

	ret = of_graph_parse_endpoint(np, &ep);
	of_node_put(port_np);

	if (ret)
	return ret;

	/* We currently only support panel output */
	return atmel_hlcdc_create_panel_output(dev, &ep);
	}