Hi, On 10/25/12 22:15, Jesse Barnes wrote: > This allows us to get the right vblank interrupt frequency. > > v2: pull in register definition > > Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org> > --- > drivers/gpu/drm/i915/i915_reg.h | 2 ++ > drivers/gpu/drm/i915/intel_pm.c | 7 +++++++ > 2 files changed, 9 insertions(+) > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h > index 6464eaa..4aec0a3 100644 > --- a/drivers/gpu/drm/i915/i915_reg.h > +++ b/drivers/gpu/drm/i915/i915_reg.h > @@ -556,6 +556,8 @@ > #define IIR 0x020a4 > #define IMR 0x020a8 > #define ISR 0x020ac > +#define VLV_GUNIT_CLOCK_GATE 0x182060 Where did you pull this offset from? It's not in the Bspec. > +#define GCFG_DIS (1<<8) > #define VLV_IIR_RW 0x182084 > #define VLV_IER 0x1820a0 > #define VLV_IIR 0x1820a4 > diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c > index d04e87f..88c154c 100644 > --- a/drivers/gpu/drm/i915/intel_pm.c > +++ b/drivers/gpu/drm/i915/intel_pm.c > @@ -3713,6 +3713,13 @@ static void valleyview_init_clock_gating(struct drm_device *dev) > PIPEA_HLINE_INT_EN | PIPEA_VBLANK_INT_EN | > SPRITEB_FLIPDONE_INT_EN | SPRITEA_FLIPDONE_INT_EN | > PLANEA_FLIPDONE_INT_EN); > + > + /* > + * WaDisableVLVClockGating_VBIIssue > + * Disable clock gating on th GCFG unit to prevent a delay > + * in the reporting of vblank events. > + */ > + I915_WRITE(VLV_GUNIT_CLOCK_GATE, GCFG_DIS); > } > > static void g4x_init_clock_gating(struct drm_device *dev) -- - Antti
