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

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

[Laurent Pinchart]

Instead of forcing bridges to implement empty callbacks make them all
optional.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
---
 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);
 };
-- 
Regards,

Laurent Pinchart

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

[Thierry Reding]

[-- Attachment #1.1: Type: text/plain, Size: 426 bytes --]

On Fri, Feb 26, 2016 at 11:51:06AM +0200, Laurent Pinchart wrote:
> Instead of forcing bridges to implement empty callbacks make them all
> optional.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> ---
>  drivers/gpu/drm/drm_bridge.c | 12 ++++++++----
>  include/drm/drm_crtc.h       |  8 ++++++++
>  2 files changed, 16 insertions(+), 4 deletions(-)

Applied, thanks.

Thierry

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[-- Attachment #2: Type: text/plain, Size: 160 bytes --]

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

[Daniel Vetter]

On Fri, Feb 26, 2016 at 11:51:06AM +0200, Laurent Pinchart wrote:
> Instead of forcing bridges to implement empty callbacks make them all
> optional.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

Care to go around the tree a nuke them all? On a quick grep I spotted at
least some in msm.
-Daniel

> ---
>  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);
>  };
> -- 
> Regards,
> 
> Laurent Pinchart
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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Re: [PATCH] drm: bridge: Make (pre/post) enable/disable callbacks optional

[Archit Taneja]

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@codeaurora.org>

>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> ---
>   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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Forum, hosted by The Linux Foundation
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Re: [PATCH] drm: bridge: Make (pre/post) enable/disable callbacks optional

[Daniel Vetter]

On Thu, Mar 24, 2016 at 12:19:32PM +0530, Archit Taneja wrote:
> 
> 
> 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@codeaurora.org>

Applied to drm-misc. Still hoping for follow-ups to nuke the now
redundant dummy funcs.

Thanks, Daniel

> 
> >
> >Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> >---
> >  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);
> >  };
> >
> 
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
_______________________________________________
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Re: [PATCH] drm: bridge: Make (pre/post) enable/disable callbacks optional

[Archit Taneja]

On 3/29/2016 12:04 PM, Daniel Vetter wrote:
> On Thu, Mar 24, 2016 at 12:19:32PM +0530, Archit Taneja wrote:
>>
>>
>> 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@codeaurora.org>
>
> Applied to drm-misc. Still hoping for follow-ups to nuke the now
> redundant dummy funcs.

Only the dw-hdmi bridge driver used such nops. I posted a patch for
that.

Archit

>
> Thanks, Daniel
>
>>
>>>
>>> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
>>> ---
>>>   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);
>>>   };
>>>
>>
>> --
>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
>> hosted by The Linux Foundation
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>

-- 
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a Linux Foundation Collaborative Project
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