Messages in this thread Patch in this message | | | From | Eric Anholt <> | Subject | [PATCH 2/2] drm/i915: Turn on another required clock gating bit on gen6. | Date | Mon, 7 Nov 2011 16:07:05 -0800 |
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Unlike the previous one, I don't have known testcases it fixes. I'd rather not go through the same debug cycle on whatever testcases those might be.
Signed-off-by: Eric Anholt <eric@anholt.net> Cc: stable@kernel.org --- drivers/gpu/drm/i915/i915_reg.h | 1 + drivers/gpu/drm/i915/intel_display.c | 7 ++++++- 2 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 6ba7ea6..5a25e75 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -3399,6 +3399,7 @@ #define GEN6_UCGCTL2 0x9404 # define GEN6_RCPBUNIT_CLOCK_GATE_DISABLE (1 << 12) +# define GEN6_RCCUNIT_CLOCK_GATE_DISABLE (1 << 11) #define GEN6_RPNSWREQ 0xA008 #define GEN6_TURBO_DISABLE (1<<31) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index fde7c42..82595a3 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -7856,8 +7856,13 @@ static void gen6_init_clock_gating(struct drm_device *dev) * some amount of runtime in the Mesa "fire" demo, and Unigine * Sanctuary and Tropics, and apparently anything else with * alpha test or pixel discard. + * + * According to the spec, bit 11 (RCCUNIT) must also be set, + * but we didn't debug actual testcases to find it out. */ - I915_WRITE(GEN6_UCGCTL2, GEN6_RCPBUNIT_CLOCK_GATE_DISABLE); + I915_WRITE(GEN6_UCGCTL2, + GEN6_RCPBUNIT_CLOCK_GATE_DISABLE | + GEN6_RCCUNIT_CLOCK_GATE_DISABLE); /* * According to the spec the following bits should be -- 1.7.7
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