[PATCH v3 11/21] drm/bridge: parade-ps8622: add drm_panel_bridge support

[Laurent Pinchart]

Hi Sam,

Thank you for the patch.

On Fri, Jul 03, 2020 at 09:24:07PM +0200, Sam Ravnborg wrote:
> Prepare the bridge driver for use in a chained setup by
> replacing direct use of drm_panel with drm_panel_bridge support.
> 
> Note: the bridge panel will use the connector type from the panel.
> 
> Signed-off-by: Sam Ravnborg <sam at ravnborg.org>
> Cc: Andrzej Hajda <a.hajda at samsung.com>
> Cc: Neil Armstrong <narmstrong at baylibre.com>
> Cc: Laurent Pinchart <Laurent.pinchart at ideasonboard.com>
> Cc: Jonas Karlman <jonas at kwiboo.se>
> Cc: Jernej Skrabec <jernej.skrabec at siol.net>
> ---
>  drivers/gpu/drm/bridge/parade-ps8622.c | 46 ++++++++------------------
>  1 file changed, 13 insertions(+), 33 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/parade-ps8622.c b/drivers/gpu/drm/bridge/parade-ps8622.c
> index d789ea2a7fb9..6ab6f60b9091 100644
> --- a/drivers/gpu/drm/bridge/parade-ps8622.c
> +++ b/drivers/gpu/drm/bridge/parade-ps8622.c
> @@ -45,7 +45,7 @@ struct ps8622_bridge {
>  	struct drm_connector connector;
>  	struct i2c_client *client;
>  	struct drm_bridge bridge;
> -	struct drm_panel *panel;
> +	struct drm_bridge *panel_bridge;
>  	struct regulator *v12;
>  	struct backlight_device *bl;
>  
> @@ -365,11 +365,6 @@ static void ps8622_pre_enable(struct drm_bridge *bridge)
>  			DRM_ERROR("fails to enable ps8622->v12");
>  	}
>  
> -	if (drm_panel_prepare(ps8622->panel)) {
> -		DRM_ERROR("failed to prepare panel\n");
> -		return;
> -	}
> -
>  	gpiod_set_value(ps8622->gpio_slp, 1);
>  
>  	/*
> @@ -399,24 +394,8 @@ static void ps8622_pre_enable(struct drm_bridge *bridge)
>  	ps8622->enabled = true;
>  }
>  
> -static void ps8622_enable(struct drm_bridge *bridge)
> -{
> -	struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
> -
> -	if (drm_panel_enable(ps8622->panel)) {
> -		DRM_ERROR("failed to enable panel\n");
> -		return;
> -	}
> -}
> -
>  static void ps8622_disable(struct drm_bridge *bridge)
>  {
> -	struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
> -
> -	if (drm_panel_disable(ps8622->panel)) {
> -		DRM_ERROR("failed to disable panel\n");
> -		return;
> -	}
>  	msleep(PS8622_PWMO_END_T12_MS);

What's the point in just waiting in the disable path ?

>  }
>  
> @@ -436,11 +415,6 @@ static void ps8622_post_disable(struct drm_bridge *bridge)
>  	 */
>  	gpiod_set_value(ps8622->gpio_slp, 0);
>  
> -	if (drm_panel_unprepare(ps8622->panel)) {
> -		DRM_ERROR("failed to unprepare panel\n");
> -		return;
> -	}
> -
>  	if (ps8622->v12)
>  		regulator_disable(ps8622->v12);
>  
> @@ -461,7 +435,7 @@ static int ps8622_get_modes(struct drm_connector *connector)
>  
>  	ps8622 = connector_to_ps8622(connector);
>  
> -	return drm_panel_get_modes(ps8622->panel, connector);
> +	return drm_bridge_get_modes(ps8622->panel_bridge, connector);
>  }
>  
>  static const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = {
> @@ -482,6 +456,9 @@ static int ps8622_attach(struct drm_bridge *bridge,
>  	struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
>  	int ret;
>  
> +	ret = drm_bridge_attach(ps8622->bridge.encoder, ps8622->panel_bridge,
> +				&ps8622->bridge, flags);

Same comment as earlier in this series about double connector creation.

Don't you need to check ret here ?

> +
>  	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
>  		DRM_ERROR("Fix bridge driver to make connector optional!");
>  		return -EINVAL;
> @@ -505,9 +482,6 @@ static int ps8622_attach(struct drm_bridge *bridge,
>  	drm_connector_attach_encoder(&ps8622->connector,
>  							bridge->encoder);
>  
> -	if (ps8622->panel)
> -		drm_panel_attach(ps8622->panel, &ps8622->connector);
> -
>  	drm_helper_hpd_irq_event(ps8622->connector.dev);
>  
>  	return ret;
> @@ -515,7 +489,6 @@ static int ps8622_attach(struct drm_bridge *bridge,
>  
>  static const struct drm_bridge_funcs ps8622_bridge_funcs = {
>  	.pre_enable = ps8622_pre_enable,
> -	.enable = ps8622_enable,
>  	.disable = ps8622_disable,
>  	.post_disable = ps8622_post_disable,
>  	.attach = ps8622_attach,
> @@ -533,16 +506,23 @@ static int ps8622_probe(struct i2c_client *client,
>  {
>  	struct device *dev = &client->dev;
>  	struct ps8622_bridge *ps8622;
> +	struct drm_bridge *pbridge;
> +	struct drm_panel *panel;
>  	int ret;
>  
>  	ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL);
>  	if (!ps8622)
>  		return -ENOMEM;
>  
> -	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ps8622->panel, NULL);
> +	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, NULL);
>  	if (ret)
>  		return ret;
>  
> +	pbridge = devm_drm_panel_bridge_add(dev, panel);
> +	if (IS_ERR(pbridge))
> +		return PTR_ERR(pbridge);
> +
> +	ps8622->panel_bridge = pbridge;
>  	ps8622->client = client;
>  
>  	ps8622->v12 = devm_regulator_get(dev, "vdd12");

-- 
Regards,

Laurent Pinchart