[Intel-gfx] [PATCH] drm/i915: Mask LPSP to get PSR working even with Power Well in use by audio.

[Daniel Vetter]

On Thu, Oct 03, 2013 at 01:31:26PM -0300, Rodrigo Vivi wrote:
> Power Well in use forces constantly PSR to exit.
> On recent Kernel I noticed that PSR Performance Counter was always 0
> indicating that PSR was never really achieved.
> By masking LPSP, PSR can work normally and save power on Haswell.
> 
> Two bugs had been raised with PSR flag enabled:
> - "Screen flickers when booted by enabling PSR in the kernel (i915.enable_psr=1) , the system is booting to a gray screen."
> - "When booting the DUT with PSR feature enabled in the kernel (i915.enable_psr=1) , the system is booting to a gray screen."
> 
> Both bugs has been fixed by this patch.
> 
> v2: proper comment for -fixes
> 
> Tested-by: Selvaraj, Elavarasan <elavarasanx.selvaraj at intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi at gmail.com>

Picked up for -fixes, thanks for the patch.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch