From da2518f9262c89dd182894b29ba45e3d8c95f65c Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Wed, 21 Jan 2015 19:38:01 +0200 Subject: [PATCH] drm/i915: Change VLV WIZ hashing mode to 16x4 MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit We set the WIZ hashing mode to 16x4 for all the other gen6+ platfotrms, so let's follow suit on VLV. My VLV is AWOL currently so I didn't test this, but since the results for all the other platforms agree that 16x4 is the fastest we might assume the same holds for VLV. Signed-off-by: Ville Syrjälä Reviewed-by: Arun Siluvery Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_pm.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index e94371e05016..3e630feb18e4 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -6229,6 +6229,17 @@ static void valleyview_init_clock_gating(struct drm_device *dev) I915_WRITE(CACHE_MODE_1, _MASKED_BIT_ENABLE(PIXEL_SUBSPAN_COLLECT_OPT_DISABLE)); + /* + * BSpec recommends 8x4 when MSAA is used, + * however in practice 16x4 seems fastest. + * + * Note that PS/WM thread counts depend on the WIZ hashing + * disable bit, which we don't touch here, but it's good + * to keep in mind (see 3DSTATE_PS and 3DSTATE_WM). + */ + I915_WRITE(GEN7_GT_MODE, + _MASKED_FIELD(GEN6_WIZ_HASHING_MASK, GEN6_WIZ_HASHING_16x4)); + /* * WaIncreaseL3CreditsForVLVB0:vlv * This is the hardware default actually. -- 2.20.1