From 0cc4b69960f3d1231023ad5de6cacbc1fbee2a88 Mon Sep 17 00:00:00 2001 From: Rodrigo Vivi Date: Thu, 3 Oct 2013 13:31:26 -0300 Subject: [PATCH] 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 Signed-off-by: Rodrigo Vivi Cc: stable@vger.kernel.org Signed-off-by: Daniel Vetter --- Reading git-format-patch failed