[Intel-gfx] [fixup PATCH] drm/i915: Only commit active planes when updating planes during reset.

[Maarten Lankhorst]

In a future commit commit_plane will no longer check if the crtc is active.
To prevent issues with legacy page flips the check should be performed inside
update_primary_planes.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
----

Hey,

Op 14-09-15 om 11:02 schreef Daniel Vetter:
> On Thu, Sep 10, 2015 at 07:34:05PM +0300, Ville Syrjälä wrote:
>> On Thu, Sep 10, 2015 at 06:31:02PM +0200, Daniel Vetter wrote:
>>> On Thu, Sep 10, 2015 at 06:43:26PM +0300, Ville Syrjälä wrote:
>>>> On Thu, Sep 10, 2015 at 04:07:58PM +0200, Maarten Lankhorst wrote:
>>>>> This function was still using the legacy state, convert it to atomic.
>>>>> While we're at it, fix the FIXME too and disable the primary plane.
>>>>>
>>>>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
>>>>> ---
>>>>>  drivers/gpu/drm/i915/intel_display.c | 26 ++++++++++++--------------
>>>>>  1 file changed, 12 insertions(+), 14 deletions(-)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
>>>>> index 33200403a5db..b68aa95c5460 100644
>>>>> --- a/drivers/gpu/drm/i915/intel_display.c
>>>>> +++ b/drivers/gpu/drm/i915/intel_display.c
>>>>> @@ -3138,24 +3138,22 @@ static void intel_complete_page_flips(struct drm_device *dev)
>>>>>  
>>>>>  static void intel_update_primary_planes(struct drm_device *dev)
>>>>>  {
>>>>> -	struct drm_i915_private *dev_priv = dev->dev_private;
>>>>>  	struct drm_crtc *crtc;
>>>>>  
>>>>>  	for_each_crtc(dev, crtc) {
>>>>> -		struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
>>>>> +		struct intel_plane *plane = to_intel_plane(crtc->primary);
>>>>> +		struct intel_plane_state *plane_state;
>>>>>  
>>>>> -		drm_modeset_lock(&crtc->mutex, NULL);
>>>>> -		/*
>>>>> -		 * FIXME: Once we have proper support for primary planes (and
>>>>> -		 * disabling them without disabling the entire crtc) allow again
>>>>> -		 * a NULL crtc->primary->fb.
>>>>> -		 */
>>>>> -		if (intel_crtc->active && crtc->primary->fb)
>>>>> -			dev_priv->display.update_primary_plane(crtc,
>>>>> -							       crtc->primary->fb,
>>>>> -							       crtc->x,
>>>>> -							       crtc->y);
>>>>> -		drm_modeset_unlock(&crtc->mutex);
>>>>> +		drm_modeset_lock_crtc(crtc, &plane->base);
>>>>> +
>>>>> +		plane_state = to_intel_plane_state(plane->base.state);
>>>>> +
>>>>> +		if (plane_state->base.fb)
>>>>> +			plane->commit_plane(&plane->base, plane_state);
>>>>> +		else if (crtc->state->active)
>>>>> +			plane->disable_plane(&plane->base, crtc);
>>>> That doesn't make sense. There's no way to disable a plane with a page
>>>> flip, so there's simply nothing to do here if the fb is NULL. If we can
>>>> trust the plane state to be sane we should just check 'visible' here and
>>>> commit the plane in that case.
>>> Right missed that and squash up a fixup that Ville acked on irc. Also
>>> added the FIXME comment too.
>> Actually I take it back. We just lost the ->active check entirely so now
>> we're commiting a plane on a disabled pipe potentially.
> Blergh and I tagged the pile already :( Maarten, can you pls send out the
> fixup as a separate patch asap?
>
This is not currently an issue because "drm/i915: Only run commit when crtc is active.' is not applied.

Thanks for catching though!
---
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 452e8f77151d..47d9c0f8b2fb 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3145,10 +3145,9 @@ static void intel_update_primary_planes(struct drm_device *dev)
 		struct intel_plane_state *plane_state;
 
 		drm_modeset_lock_crtc(crtc, &plane->base);
-
 		plane_state = to_intel_plane_state(plane->base.state);
 
-		if (plane_state->base.fb)
+		if (crtc->state->active && plane_state->base.fb)
 			plane->commit_plane(&plane->base, plane_state);
 
 		drm_modeset_unlock_crtc(crtc);