[Intel-gfx] Request for feedback - Sprite flip notification support

[Ville Syrjälä]

On Wed, Feb 05, 2014 at 08:35:11PM +0530, Vijay Purushothaman wrote:
> Hello,
> 
> In our current driver implementation we support flip notifications only 
> for primary plane. So, in a full screen video playback scenario where 
> only one sprite plane is active, the user space is forced to rely on 
> primary plane flip notification even though there is no real need for 
> this plane to be active. Ideally we should be able to support flip 
> notifications for any given plane. Switching off the primary plane (when 
> not used) will help in better memory self refresh & decent power savings..
> 
> We do have a hack in android product trees which supports flip 
> notifications for one sprite plane. unfortunately this hack in its 
> current form cannot be considered for up streaming...
> 
> My current thinking is to have an array of unpin_work items to match the 
> number of planes. Is anyone working on this or thought about this 
> scenario in detail? Any pointers / restrictions that needs to considered 
> for a generic implementation of this feature?

The plan is to implement the nuclear page flip which will take care of
all planes in the same way.

-- 
Ville Syrjälä
Intel OTC