Re: [PATCH v2] drm/i915: Re-enable FBC WM if the watermark is good on gen6+

[Paulo Zanoni <przanoni@gmail.com>]

2013/4/24  <ville.syrjala@linux.intel.com>:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> If the calculated FBC watermark is no good, we simply disable FBC
> watermarks. But we fail to re-enable them later if the calculated
> watermark becomes good again. Fix that, but remember to leave FBC
> watermarks disabled on ILK since that's required by some workarounds.
>
> v2: Fix checkpatch complaint
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

Looks correct...
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

> ---
>  drivers/gpu/drm/i915/intel_pm.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 3534a71..da8f307 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -1633,6 +1633,10 @@ static bool ironlake_check_srwm(struct drm_device *dev, int level,
>                 I915_WRITE(DISP_ARB_CTL,
>                            I915_READ(DISP_ARB_CTL) | DISP_FBC_WM_DIS);
>                 return false;
> +       } else if (INTEL_INFO(dev)->gen >= 6) {
> +               /* enable FBC WM (except on ILK, where it must remain off) */
> +               I915_WRITE(DISP_ARB_CTL,
> +                          I915_READ(DISP_ARB_CTL) & ~DISP_FBC_WM_DIS);
>         }
>
>         if (display_wm > display->max_wm) {
> --
> 1.8.1.5
>
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-- 
Paulo Zanoni