[Intel-gfx] [PATCH 06/12] drm/i915: implement WaDisableVLVClockGating_VBIIssue on VLV

[Ben Widawsky]

On Tue,  2 Oct 2012 17:43:40 -0500
Jesse Barnes <jbarnes at virtuousgeek.org> wrote:

> This allows us to get the right vblank interrupt frequency.
> 
> Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
> ---
>  drivers/gpu/drm/i915/intel_pm.c |    7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 0659317..828629b 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3687,6 +3687,13 @@ 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)


This seems like only X0.


-- 
Ben Widawsky, Intel Open Source Technology Center