Re: [PATCH v2] drm/bridge: nwl-dsi: switch to devm_drm_of_get_bridge

[Liu Ying <victor.liu@oss.nxp.com>]

On Thu, 2022-03-17 at 18:58 +0100, José Expósito wrote:
> The function "drm_of_find_panel_or_bridge" has been deprecated in
> favor of "devm_drm_of_get_bridge".
> 
> Switch to the new function and reduce boilerplate.
> 
> Signed-off-by: José Expósito <jose.exposito89@gmail.com>
> 
> ---
> 
> v2: (Thanks to Liu Ying)
> 
>  - Rebase on top of drm-misc-next
>  - Remove drm_of_panel_bridge_remove
> ---
>  drivers/gpu/drm/bridge/nwl-dsi.c | 23 ++++-------------------
>  1 file changed, 4 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c
> b/drivers/gpu/drm/bridge/nwl-dsi.c
> index e34fb09b90b9..de62e3fc6a59 100644
> --- a/drivers/gpu/drm/bridge/nwl-dsi.c
> +++ b/drivers/gpu/drm/bridge/nwl-dsi.c
> @@ -912,19 +912,11 @@ static int nwl_dsi_bridge_attach(struct
> drm_bridge *bridge,
>  {
>  	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
>  	struct drm_bridge *panel_bridge;
> -	struct drm_panel *panel;
> -	int ret;
> -
> -	ret = drm_of_find_panel_or_bridge(dsi->dev->of_node, 1, 0,
> &panel,
> -					  &panel_bridge);
> -	if (ret)
> -		return ret;
>  
> -	if (panel) {
> -		panel_bridge = drm_panel_bridge_add(panel);
> -		if (IS_ERR(panel_bridge))
> -			return PTR_ERR(panel_bridge);
> -	}
> +	panel_bridge = devm_drm_of_get_bridge(dsi->dev, dsi->dev-
> >of_node,
> +					      1, 0);
> +	if (IS_ERR(panel_bridge))
> +		return PTR_ERR(panel_bridge);
>  
>  	if (!panel_bridge)
>  		return -EPROBE_DEFER;

I don't think panel_bridge can be NULL here, so this check can be
removed.  However, even if this patch is not applied, the check is not
necessary.  I think it can be removed with a separate patch.

For this patch:
Reviewed-by: Liu Ying <victor.liu@oss.nxp.com>

> @@ -932,12 +924,6 @@ static int nwl_dsi_bridge_attach(struct
> drm_bridge *bridge,
>  	return drm_bridge_attach(bridge->encoder, panel_bridge, bridge,
> flags);
>  }
>  
> -static void nwl_dsi_bridge_detach(struct drm_bridge *bridge)
> -{	struct nwl_dsi *dsi = bridge_to_dsi(bridge);
> -
> -	drm_of_panel_bridge_remove(dsi->dev->of_node, 1, 0);
> -}
> -
>  static u32 *nwl_bridge_atomic_get_input_bus_fmts(struct drm_bridge
> *bridge,
>  						 struct
> drm_bridge_state *bridge_state,
>  						 struct drm_crtc_state
> *crtc_state,
> @@ -983,7 +969,6 @@ static const struct drm_bridge_funcs
> nwl_dsi_bridge_funcs = {
>  	.mode_set		= nwl_dsi_bridge_mode_set,
>  	.mode_valid		= nwl_dsi_bridge_mode_valid,
>  	.attach			= nwl_dsi_bridge_attach,
> -	.detach			= nwl_dsi_bridge_detach,
>  };
>  
>  static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)