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drm/i915: add TDL unit clock gating disable for VLV 

Another required workaround for a potential hang:
WaDisableTDLUnitClockGating.

v2: only apply this to VLV, IVB doesn't need it anymore (Eugeni)

References: https://bugs.freedesktop.org/show_bug.cgi?id=50245
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jesse Barnes 2012-06-14 11:04:49 -07:00 committed by Daniel Vetter
parent b4ae3f22d2
commit 6edaa7fcf2
2 changed files with 2 additions and 0 deletions
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1
drivers/gpu/drm/i915/i915_reg.h
View File

@ -4038,6 +4038,7 @@
#define GEN6_UCGCTL2 0x9404
# define GEN7_VDSUNIT_CLOCK_GATE_DISABLE (1 << 30)
# define GEN7_TDLUNIT_CLOCK_GATE_DISABLE (1 << 22)
# define GEN6_RCZUNIT_CLOCK_GATE_DISABLE (1 << 13)
# define GEN6_RCPBUNIT_CLOCK_GATE_DISABLE (1 << 12)
# define GEN6_RCCUNIT_CLOCK_GATE_DISABLE (1 << 11)

1
drivers/gpu/drm/i915/intel_pm.c
View File

@ -3512,6 +3512,7 @@ static void valleyview_init_clock_gating(struct drm_device *dev)
*/
I915_WRITE(GEN6_UCGCTL2,
GEN7_VDSUNIT_CLOCK_GATE_DISABLE |
GEN7_TDLUNIT_CLOCK_GATE_DISABLE |
GEN6_RCZUNIT_CLOCK_GATE_DISABLE |
GEN6_RCPBUNIT_CLOCK_GATE_DISABLE |
GEN6_RCCUNIT_CLOCK_GATE_DISABLE);