Subject: [RFC PATCH 2/8] drm: exynos/dp: convert to drm bridge mode

From: [email-masked] (Jingoo Han)
Date: Thu, 6 Aug 2015 23:19:35 +0900

On Thursday, August 06, 2015 11:07 PM, Yakir Yang wrote:
> 
> In order to move exynos dp code to bridge directory,
> we need to convert driver drm bridge mode first. As
> dp driver already have a ptn3460 bridge, so we need
> to move ptn bridge to the next bridge of dp bridge.
> 
> Signed-off-by: Yakir Yang <[email-masked]>
> ---
>  drivers/gpu/drm/exynos/exynos_dp_core.c | 196 ++++++++++++++++++++------------
>  drivers/gpu/drm/exynos/exynos_dp_core.h |   2 +
>  2 files changed, 126 insertions(+), 72 deletions(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.c b/drivers/gpu/drm/exynos/exynos_dp_core.c
> index a8097a4..aa99e23 100644
> --- a/drivers/gpu/drm/exynos/exynos_dp_core.c
> +++ b/drivers/gpu/drm/exynos/exynos_dp_core.c
> @@ -3,6 +3,7 @@
>   *
>   * Copyright (C) 2012 Samsung Electronics Co., Ltd.
>   * Author: Jingoo Han <[email-masked]>
> + *         Yakir Yang <[email-masked]>

Please don't add this.
You just fixed some parts of this code. I don't find the reason
why you have to be added to author for this file.
If you want the title for an author, please send the patch
for a new IP, instead of modifying the exiting codes.

>   *
>   * 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
> @@ -998,59 +999,6 @@ static struct drm_connector_helper_funcs exynos_dp_connector_helper_funcs = {
>  	.best_encoder = exynos_dp_best_encoder,
>  };
> 
> -/* returns the number of bridges attached */
> -static int exynos_drm_attach_lcd_bridge(struct exynos_dp_device *dp,
> -					struct drm_encoder *encoder)
> -{
> -	int ret;
> -
> -	encoder->bridge = dp->bridge;
> -	dp->bridge->encoder = encoder;
> -	ret = drm_bridge_attach(encoder->dev, dp->bridge);
> -	if (ret) {
> -		DRM_ERROR("Failed to attach bridge to drm\n");
> -		return ret;
> -	}
> -
> -	return 0;
> -}
> -
> -static int exynos_dp_create_connector(struct exynos_drm_display *display,
> -				      struct drm_encoder *encoder)
> -{
> -	struct exynos_dp_device *dp = display_to_dp(display);
> -	struct drm_connector *connector = &dp->connector;
> -	int ret;
> -
> -	dp->encoder = encoder;
> -
> -	/* Pre-empt DP connector creation if there's a bridge */
> -	if (dp->bridge) {
> -		ret = exynos_drm_attach_lcd_bridge(dp, encoder);
> -		if (!ret)
> -			return 0;
> -	}
> -
> -	connector->polled = DRM_CONNECTOR_POLL_HPD;
> -
> -	ret = drm_connector_init(dp->drm_dev, connector,
> -				 &exynos_dp_connector_funcs,
> -				 DRM_MODE_CONNECTOR_eDP);
> -	if (ret) {
> -		DRM_ERROR("Failed to initialize connector with drm\n");
> -		return ret;
> -	}
> -
> -	drm_connector_helper_add(connector, &exynos_dp_connector_helper_funcs);
> -	drm_connector_register(connector);
> -	drm_mode_connector_attach_encoder(connector, encoder);
> -
> -	if (dp->panel)
> -		ret = drm_panel_attach(dp->panel, &dp->connector);
> -
> -	return ret;
> -}
> -
>  static void exynos_dp_phy_init(struct exynos_dp_device *dp)
>  {
>  	if (dp->phy)
> @@ -1115,23 +1063,126 @@ static void exynos_dp_poweroff(struct exynos_dp_device *dp)
>  	}
>  }
> 
> -static void exynos_dp_dpms(struct exynos_drm_display *display, int mode)
> +/* returns the number of bridges attached */
> +static int exynos_drm_attach_lcd_bridge(struct exynos_dp_device *dp,
> +		struct drm_encoder *encoder)
> +{
> +	int ret;
> +
> +	dp->bridge->next = dp->ptn_bridge;
> +	dp->bridge->encoder = encoder;
> +	ret = drm_bridge_attach(encoder->dev, dp->bridge);
> +	if (ret) {
> +		DRM_ERROR("Failed to attach ptn bridge to drm\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int exynos_dp_bridge_attach(struct drm_bridge *bridge)
> +{
> +
> +	struct exynos_dp_device *dp = bridge->driver_private;
> +	struct drm_encoder *encoder = dp->encoder;
> +	struct drm_connector *connector = &dp->connector;
> +	int ret;
> +
> +	if (!bridge->encoder) {
> +		DRM_ERROR("Parent encoder object not found");
> +		return -ENODEV;
> +	}
> +
> +	encoder->bridge = bridge;
> +
> +	/* Pre-empt DP connector creation if there's a bridge */
> +	if (dp->ptn_bridge) {
> +		ret = exynos_drm_attach_lcd_bridge(dp, encoder);
> +		if (ret)
> +			return -ENODEV;
> +	}
> +
> +	connector->polled = DRM_CONNECTOR_POLL_HPD;
> +
> +	ret = drm_connector_init(dp->drm_dev, connector,
> +			&exynos_dp_connector_funcs, DRM_MODE_CONNECTOR_eDP);
> +	if (ret) {
> +		DRM_ERROR("Failed to initialize connector with drm\n");
> +		return ret;
> +	}
> +
> +	drm_connector_helper_add(connector, &exynos_dp_connector_helper_funcs);
> +	drm_connector_register(connector);
> +	drm_mode_connector_attach_encoder(connector, encoder);
> +
> +	if (dp->panel)
> +		ret = drm_panel_attach(dp->panel, &dp->connector);
> +
> +	return ret;
> +}
> +
> +static void exynos_dp_bridge_nop(struct drm_bridge *bridge)
> +{
> +	/* do nothing */
> +}
> +
> +static void exynos_dp_bridge_enable(struct drm_bridge *bridge)
> +{
> +	struct exynos_dp_device *dp = bridge->driver_private;
> +
> +	exynos_dp_poweron(dp);
> +	dp->dpms_mode = DRM_MODE_DPMS_ON;
> +}
> +
> +static void exynos_dp_bridge_disable(struct drm_bridge *bridge)
> +{
> +	struct exynos_dp_device *dp = bridge->driver_private;
> +
> +	exynos_dp_poweroff(dp);
> +	dp->dpms_mode = DRM_MODE_DPMS_OFF;
> +}
> +
> +static const struct drm_bridge_funcs exynos_dp_bridge_funcs = {
> +	.enable = exynos_dp_bridge_enable,
> +	.disable = exynos_dp_bridge_disable,
> +	.pre_enable = exynos_dp_bridge_nop,
> +	.post_disable = exynos_dp_bridge_nop,
> +	.attach = exynos_dp_bridge_attach,
> +};
> +
> +static int exynos_dp_create_connector(struct exynos_drm_display *display,
> +				struct drm_encoder *encoder)
>  {
>  	struct exynos_dp_device *dp = display_to_dp(display);
> +	struct drm_device *drm_dev = dp->drm_dev;
> +	struct drm_bridge *bridge;
> +	int ret;
> 
> -	switch (mode) {
> -	case DRM_MODE_DPMS_ON:
> -		exynos_dp_poweron(dp);
> -		break;
> -	case DRM_MODE_DPMS_STANDBY:
> -	case DRM_MODE_DPMS_SUSPEND:
> -	case DRM_MODE_DPMS_OFF:
> -		exynos_dp_poweroff(dp);
> -		break;
> -	default:
> -		break;
> +	bridge = devm_kzalloc(drm_dev->dev, sizeof(*bridge), GFP_KERNEL);
> +	if (!bridge) {
> +		DRM_ERROR("failed to allocate for drm bridge\n");
> +		return -ENOMEM;
>  	}
> -	dp->dpms_mode = mode;
> +
> +	dp->bridge = bridge;
> +	dp->encoder = encoder;
> +
> +	bridge->driver_private = dp;
> +	bridge->encoder = dp->encoder;
> +	bridge->funcs = &exynos_dp_bridge_funcs;
> +
> +	ret = drm_bridge_attach(drm_dev, bridge);
> +	if (ret) {
> +		DRM_ERROR("failed to attach drm bridge\n");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static void exynos_dp_dpms(struct exynos_drm_display *display, int mode)
> +{
> +	/* do nothing */
>  }
> 
>  static struct exynos_drm_display_ops exynos_dp_display_ops = {
> @@ -1243,7 +1294,7 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
>  		}
>  	}
> 
> -	if (!dp->panel && !dp->bridge) {
> +	if (!dp->panel && !dp->ptn_bridge) {
>  		ret = exynos_dp_dt_parse_panel(dp);
>  		if (ret)
>  			return ret;
> @@ -1316,7 +1367,7 @@ static void exynos_dp_unbind(struct device *dev, struct device *master,
>  {
>  	struct exynos_dp_device *dp = dev_get_drvdata(dev);
> 
> -	exynos_dp_dpms(&dp->display, DRM_MODE_DPMS_OFF);
> +	exynos_dp_bridge_disable(dp->bridge);
>  }
> 
>  static const struct component_ops exynos_dp_ops = {
> @@ -1351,9 +1402,9 @@ static int exynos_dp_probe(struct platform_device *pdev)
>  	if (endpoint) {
>  		bridge_node = of_graph_get_remote_port_parent(endpoint);
>  		if (bridge_node) {
> -			dp->bridge = of_drm_find_bridge(bridge_node);
> +			dp->ptn_bridge = of_drm_find_bridge(bridge_node);
>  			of_node_put(bridge_node);
> -			if (!dp->bridge)
> +			if (!dp->ptn_bridge)
>  				return -EPROBE_DEFER;
>  		} else {
>  			return -EPROBE_DEFER;
> @@ -1375,7 +1426,7 @@ static int exynos_dp_suspend(struct device *dev)
>  {
>  	struct exynos_dp_device *dp = dev_get_drvdata(dev);
> 
> -	exynos_dp_dpms(&dp->display, DRM_MODE_DPMS_OFF);
> +	exynos_dp_bridge_disable(dp->bridge);
>  	return 0;
>  }
> 
> @@ -1383,7 +1434,7 @@ static int exynos_dp_resume(struct device *dev)
>  {
>  	struct exynos_dp_device *dp = dev_get_drvdata(dev);
> 
> -	exynos_dp_dpms(&dp->display, DRM_MODE_DPMS_ON);
> +	exynos_dp_bridge_enable(dp->bridge);
>  	return 0;
>  }
>  #endif
> @@ -1410,5 +1461,6 @@ struct platform_driver dp_driver = {
>  };
> 
>  MODULE_AUTHOR("Jingoo Han <[email-masked]>");
> +MODULE_AUTHOR("Yakir Yang <[email-masked]>");

The same as above.

>  MODULE_DESCRIPTION("Samsung SoC DP Driver");
>  MODULE_LICENSE("GPL v2");
> diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.h b/drivers/gpu/drm/exynos/exynos_dp_core.h
> index c321ad5..f2584b8 100644
> --- a/drivers/gpu/drm/exynos/exynos_dp_core.h
> +++ b/drivers/gpu/drm/exynos/exynos_dp_core.h
> @@ -3,6 +3,7 @@
>   *
>   * Copyright (C) 2012 Samsung Electronics Co., Ltd.
>   * Author: Jingoo Han <[email-masked]>
> + *         Yakir Yang <[email-masked]>

The same as above.
Here, you just added 1 line. If we add someone to author
in this way, a lot of people should be added to author.

Best regards,
Jingoo Han

>   *
>   * 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
> @@ -154,6 +155,7 @@ struct exynos_dp_device {
>  	struct drm_encoder	*encoder;
>  	struct drm_panel	*panel;
>  	struct drm_bridge	*bridge;
> +	struct drm_bridge	*ptn_bridge;
>  	struct clk		*clock;
>  	unsigned int		irq;
>  	void __iomem		*reg_base;
> --
> 2.1.2