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drm/i915: Turn on another required clock gating bit on gen6. 

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
Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Eric Anholt 2011-11-07 16:07:05 -08:00 committed by Keith Packard
parent 406478dc91
commit 9ca1d10d74
2 changed files with 7 additions and 1 deletions
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1
drivers/gpu/drm/i915/i915_reg.h
View File

@ -3446,6 +3446,7 @@
#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)

7
drivers/gpu/drm/i915/intel_display.c
View File

@ -8154,8 +8154,13 @@ 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