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drm/i915: Add thread stall DOP clock gating workaround on Broadwell.

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Ben and I believe this will be necessary on production hardware.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
[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 <ville.syrjala@linux.intel.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Kenneth Graunke 2014-02-26 23:59:31 -08:00 committed by Daniel Vetter
parent c8966e1058
commit 1411e6a57a
2 changed files with 6 additions and 0 deletions
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1
drivers/gpu/drm/i915/i915_reg.h
View File

@ -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

5
drivers/gpu/drm/i915/intel_pm.c
View File

@ -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