From: Kenneth Graunke Date: Thu, 27 Feb 2014 07:59:31 +0000 (-0800) Subject: drm/i915: Add thread stall DOP clock gating workaround on Broadwell. X-Git-Tag: v5.15~17777^2~63^2~275 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1411e6a57a1836ba8a3d4f17c8733b2fbaf0f005;p=platform%2Fkernel%2Flinux-starfive.git drm/i915: Add thread stall DOP clock gating workaround on Broadwell. Ben and I believe this will be necessary on production hardware. Signed-off-by: Kenneth Graunke [danvet: Shuffle lines to group all ROW_CHICKEN writes and add a cautious comment that this might not be needed on production hw.] Reviewed-by: Ville Syrjälä Reviewed-by: Ben Widawsky Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index d575baf..aa83909 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -5050,6 +5050,7 @@ #define GEN8_ROW_CHICKEN 0xe4f0 #define PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE (1<<8) +#define STALL_DOP_GATING_DISABLE (1<<5) #define GEN7_ROW_CHICKEN2 0xe4f4 #define GEN7_ROW_CHICKEN2_GT2 0xf4f4 diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index f21c9f3..bb2ca35 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -4805,6 +4805,11 @@ static void gen8_init_clock_gating(struct drm_device *dev) I915_WRITE(GEN8_ROW_CHICKEN, _MASKED_BIT_ENABLE(PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE)); + /* WaDisableThreadStallDopClockGating:bdw */ + /* FIXME: Unclear whether we really need this on production bdw. */ + I915_WRITE(GEN8_ROW_CHICKEN, + _MASKED_BIT_ENABLE(STALL_DOP_GATING_DISABLE)); + /* * This GEN8_CENTROID_PIXEL_OPT_DIS W/A is only needed for * pre-production hardware