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| author | Rodrigo Vivi <rodrigo.vivi@gmail.com> | 2013-10-03 13:31:26 -0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-10-03 20:07:17 +0200 |
| commit | 0cc4b69960f3d1231023ad5de6cacbc1fbee2a88 (patch) | |
| tree | 58ca135979734121e5f49a9184ac1c591af48e4e /lib/mpi/mpiutil.c | |
| parent | f3fc4884ebe6ae649d3723be14b219230d3b7fd2 (diff) | |
drm/i915: Mask LPSP to get PSR working even with Power Well in use by audio.
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@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'lib/mpi/mpiutil.c')
0 files changed, 0 insertions, 0 deletions