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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>
This commit is contained in:
Rodrigo Vivi 2013-10-03 13:31:26 -03:00 committed by Daniel Vetter
parent f3fc4884eb
commit 0cc4b69960
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/intel_dp.c
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@ -1467,7 +1467,7 @@ static void intel_edp_psr_setup(struct intel_dp *intel_dp)
/* Avoid continuous PSR exit by masking memup and hpd */
I915_WRITE(EDP_PSR_DEBUG_CTL, EDP_PSR_DEBUG_MASK_MEMUP |
EDP_PSR_DEBUG_MASK_HPD);
EDP_PSR_DEBUG_MASK_HPD | EDP_PSR_DEBUG_MASK_LPSP);
intel_dp->psr_setup_done = true;
}