[PATCH v4 5/5] drm: bridge: mcde_dsi: Switch to devm_drm_of_get_bridge

[Maxime Ripard]

On Thu, Mar 31, 2022 at 09:15:03PM +0530, Jagan Teki wrote:
> devm_drm_of_get_bridge is capable of looking up the downstream
> bridge and panel and trying to add a panel bridge if the panel
> is found.
> 
> Replace explicit finding calls with devm_drm_of_get_bridge.
> 
> Cc: Linus Walleij <linus.walleij at linaro.org>
> Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
> Reviewed-by: Linus Walleij <linus.walleij at linaro.org>
> ---
> Changes for v4:
> - collect r-b
> Changes for v3:
> - fix commit head
> - drop panel.h
> - use drm_bridge_remove
> Changes for v2:
> - split the patch
> 
>  drivers/gpu/drm/mcde/mcde_dsi.c | 44 +++++----------------------------
>  1 file changed, 6 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mcde/mcde_dsi.c b/drivers/gpu/drm/mcde/mcde_dsi.c
> index 5651734ce977..083a4728654d 100644
> --- a/drivers/gpu/drm/mcde/mcde_dsi.c
> +++ b/drivers/gpu/drm/mcde/mcde_dsi.c
> @@ -19,7 +19,6 @@
>  #include <drm/drm_mipi_dsi.h>
>  #include <drm/drm_modeset_helper_vtables.h>
>  #include <drm/drm_of.h>
> -#include <drm/drm_panel.h>
>  #include <drm/drm_print.h>
>  #include <drm/drm_probe_helper.h>
>  
> @@ -39,7 +38,6 @@ struct mcde_dsi {
>  	struct device *dev;
>  	struct mcde *mcde;
>  	struct drm_bridge bridge;
> -	struct drm_panel *panel;
>  	struct drm_bridge *bridge_out;
>  	struct mipi_dsi_host dsi_host;
>  	struct mipi_dsi_device *mdsi;
> @@ -1073,9 +1071,7 @@ static int mcde_dsi_bind(struct device *dev, struct device *master,
>  	struct drm_device *drm = data;
>  	struct mcde *mcde = to_mcde(drm);
>  	struct mcde_dsi *d = dev_get_drvdata(dev);
> -	struct device_node *child;
> -	struct drm_panel *panel = NULL;
> -	struct drm_bridge *bridge = NULL;
> +	struct drm_bridge *bridge;
>  
>  	if (!of_get_available_child_count(dev->of_node)) {
>  		dev_info(dev, "unused DSI interface\n");
> @@ -1100,37 +1096,10 @@ static int mcde_dsi_bind(struct device *dev, struct device *master,
>  		return PTR_ERR(d->lp_clk);
>  	}
>  
> -	/* Look for a panel as a child to this node */
> -	for_each_available_child_of_node(dev->of_node, child) {
> -		panel = of_drm_find_panel(child);
> -		if (IS_ERR(panel)) {
> -			dev_err(dev, "failed to find panel try bridge (%ld)\n",
> -				PTR_ERR(panel));
> -			panel = NULL;
> -
> -			bridge = of_drm_find_bridge(child);
> -			if (!bridge) {
> -				dev_err(dev, "failed to find bridge\n");
> -				return -EINVAL;
> -			}
> -		}
> -	}
> -	if (panel) {
> -		bridge = drm_panel_bridge_add_typed(panel,
> -						    DRM_MODE_CONNECTOR_DSI);
> -		if (IS_ERR(bridge)) {
> -			dev_err(dev, "error adding panel bridge\n");
> -			return PTR_ERR(bridge);
> -		}
> -		dev_info(dev, "connected to panel\n");
> -		d->panel = panel;
> -	} else if (bridge) {
> -		/* TODO: AV8100 HDMI encoder goes here for example */
> -		dev_info(dev, "connected to non-panel bridge (unsupported)\n");
> -		return -ENODEV;
> -	} else {
> -		dev_err(dev, "no panel or bridge\n");
> -		return -ENODEV;
> +	bridge = devm_drm_of_get_bridge(dev, dev->of_node, 0, 0);
> +	if (IS_ERR(bridge)) {
> +		dev_err(dev, "error to get bridge\n");
> +		return PTR_ERR(bridge);
>  	}
>  
>  	d->bridge_out = bridge;
> @@ -1153,8 +1122,7 @@ static void mcde_dsi_unbind(struct device *dev, struct device *master,
>  {
>  	struct mcde_dsi *d = dev_get_drvdata(dev);
>  
> -	if (d->panel)
> -		drm_panel_bridge_remove(d->bridge_out);
> +	drm_bridge_remove(d->bridge_out);

You don't need drm_bridge_remove if you used devm_drm_of_get_bridge

Maxime
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