Re: [PATCH] drm: bridge: Make (pre/post) enable/disable callbacks optional

[Archit Taneja <architt@xxxxxxxxxxxxxx>]

On 02/26/2016 03:21 PM, Laurent Pinchart wrote:
> Instead of forcing bridges to implement empty callbacks make them all
> optional.

Acked-by: Archit Taneja <architt@xxxxxxxxxxxxxx>

> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
> ---
>   drivers/gpu/drm/drm_bridge.c | 12 ++++++++----
>   include/drm/drm_crtc.h       |  8 ++++++++
>   2 files changed, 16 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
> index bd93453afa61..b3654404abd0 100644
> --- a/drivers/gpu/drm/drm_bridge.c
> +++ b/drivers/gpu/drm/drm_bridge.c
> @@ -186,7 +186,8 @@ void drm_bridge_disable(struct drm_bridge *bridge)
>
>   	drm_bridge_disable(bridge->next);
>
> -	bridge->funcs->disable(bridge);
> +	if (bridge->funcs->disable)
> +		bridge->funcs->disable(bridge);
>   }
>   EXPORT_SYMBOL(drm_bridge_disable);
>
> @@ -206,7 +207,8 @@ void drm_bridge_post_disable(struct drm_bridge *bridge)
>   	if (!bridge)
>   		return;
>
> -	bridge->funcs->post_disable(bridge);
> +	if (bridge->funcs->post_disable)
> +		bridge->funcs->post_disable(bridge);
>
>   	drm_bridge_post_disable(bridge->next);
>   }
> @@ -256,7 +258,8 @@ void drm_bridge_pre_enable(struct drm_bridge *bridge)
>
>   	drm_bridge_pre_enable(bridge->next);
>
> -	bridge->funcs->pre_enable(bridge);
> +	if (bridge->funcs->pre_enable)
> +		bridge->funcs->pre_enable(bridge);
>   }
>   EXPORT_SYMBOL(drm_bridge_pre_enable);
>
> @@ -276,7 +279,8 @@ void drm_bridge_enable(struct drm_bridge *bridge)
>   	if (!bridge)
>   		return;
>
> -	bridge->funcs->enable(bridge);
> +	if (bridge->funcs->enable)
> +		bridge->funcs->enable(bridge);
>
>   	drm_bridge_enable(bridge->next);
>   }
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index 7fad193dc645..fbc225414f01 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -1584,6 +1584,8 @@ struct drm_bridge_funcs {
>   	 *
>   	 * The bridge can assume that the display pipe (i.e. clocks and timing
>   	 * signals) feeding it is still running when this callback is called.
> +	 *
> +	 * The disable callback is optional.
>   	 */
>   	void (*disable)(struct drm_bridge *bridge);
>
> @@ -1600,6 +1602,8 @@ struct drm_bridge_funcs {
>   	 * The bridge must assume that the display pipe (i.e. clocks and timing
>   	 * singals) feeding it is no longer running when this callback is
>   	 * called.
> +	 *
> +	 * The post_disable callback is optional.
>   	 */
>   	void (*post_disable)(struct drm_bridge *bridge);
>
> @@ -1628,6 +1632,8 @@ struct drm_bridge_funcs {
>   	 * will not yet be running when this callback is called. The bridge must
>   	 * not enable the display link feeding the next bridge in the chain (if
>   	 * there is one) when this callback is called.
> +	 *
> +	 * The pre_enable callback is optional.
>   	 */
>   	void (*pre_enable)(struct drm_bridge *bridge);
>
> @@ -1645,6 +1651,8 @@ struct drm_bridge_funcs {
>   	 * signals) feeding it is running when this callback is called. This
>   	 * callback must enable the display link feeding the next bridge in the
>   	 * chain if there is one.
> +	 *
> +	 * The enable callback is optional.
>   	 */
>   	void (*enable)(struct drm_bridge *bridge);
>   };

--
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