Attachment 71522 Details for Bug 55409 – implement Hiz w/a for msaa

[patch] implement Hiz w/a for msaa

0001-drm-i915-Implement-WaDisableHiZPlanesWhenMSAAEnabled.patch (text/plain), 1.58 KB, created by Daniel Vetter on 2012-12-14 22:14:18 UTC

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Creator: Daniel Vetter

Created: 2012-12-14 22:14:18 UTC

Size: 1.58 KB

patch

obsolete

>From 60da51ee5aa4794b42afcde411eb4c069903fdbd Mon Sep 17 00:00:00 2001
>From: Daniel Vetter <daniel.vetter@ffwll.ch>
>Date: Fri, 14 Dec 2012 23:10:55 +0100
>Subject: [PATCH] drm/i915: Implement WaDisableHiZPlanesWhenMSAAEnabled
>
>Quoting from Bspec, 3D_CHICKEN1, bit 10
>
>This bit needs to be set always to "1", Project: DevSNB "
>
>Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>---
> drivers/gpu/drm/i915/i915_reg.h |    1 +
> drivers/gpu/drm/i915/intel_pm.c |    4 ++++
> 2 files changed, 5 insertions(+)
>
>diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
>index f834804..d72744e 100644
>--- a/drivers/gpu/drm/i915/i915_reg.h
>+++ b/drivers/gpu/drm/i915/i915_reg.h
>@@ -518,6 +518,7 @@
>  * the enables for writing to the corresponding low bit.
>  */
> #define _3D_CHICKEN	0x02084
>+#define  _3D_CHICKEN_HIZ_PLANE_DISABLE_MSAA_4X_SNB	(1 << 10)
> #define _3D_CHICKEN2	0x0208c
> /* Disables pipelining of read flushes past the SF-WIZ interface.
>  * Required on all Ironlake steppings according to the B-Spec, but the
>diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
>index abfff29..2fddd17 100644
>--- a/drivers/gpu/drm/i915/intel_pm.c
>+++ b/drivers/gpu/drm/i915/intel_pm.c
>@@ -3474,6 +3474,10 @@ static void gen6_init_clock_gating(struct drm_device *dev)
> 		   I915_READ(ILK_DISPLAY_CHICKEN2) |
> 		   ILK_ELPIN_409_SELECT);
> 
>+	/* WaDisableHiZPlanesWhenMSAAEnabled */
>+	I915_WRITE(_3D_CHICKEN,
>+		   _MASKED_BIT_ENABLE(_3D_CHICKEN_HIZ_PLANE_DISABLE_MSAA_4X_SNB));
>+
> 	I915_WRITE(WM3_LP_ILK, 0);
> 	I915_WRITE(WM2_LP_ILK, 0);
> 	I915_WRITE(WM1_LP_ILK, 0);
>-- 
>1.7.10.4
>

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