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drm/i915: add L3 bank clock gating disable on VLV 

Prevents a possible hang: WaDisableL3Bank2xClockGate.

v2: only apply to VLV, IVB doesn't need this anymore

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 11:04:50 -07:00 committed by Daniel Vetter
parent 6edaa7fcf2
commit e3f33d46fd
2 changed files with 5 additions and 0 deletions
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3
drivers/gpu/drm/i915/i915_reg.h
View File

@ -4043,6 +4043,9 @@
# define GEN6_RCPBUNIT_CLOCK_GATE_DISABLE (1 << 12)
# define GEN6_RCCUNIT_CLOCK_GATE_DISABLE (1 << 11)
#define GEN7_UCGCTL4 0x940c
#define GEN7_L3BANK2X_CLOCK_GATE_DISABLE (1<<25)
#define GEN6_RPNSWREQ 0xA008
#define GEN6_TURBO_DISABLE (1<<31)
#define GEN6_FREQUENCY(x) ((x)<<25)

2
drivers/gpu/drm/i915/intel_pm.c
View File

@ -3517,6 +3517,8 @@ static void valleyview_init_clock_gating(struct drm_device *dev)
GEN6_RCPBUNIT_CLOCK_GATE_DISABLE |
GEN6_RCCUNIT_CLOCK_GATE_DISABLE);
I915_WRITE(GEN7_UCGCTL4, GEN7_L3BANK2X_CLOCK_GATE_DISABLE);
for_each_pipe(pipe) {
I915_WRITE(DSPCNTR(pipe),
I915_READ(DSPCNTR(pipe)) |