[Intel-gfx] [PATCH 03/24] drm/i915: Skip watermark merging for inactive pipes

[Paulo Zanoni]

2014-03-07 13:32 GMT-03:00  <ville.syrjala at linux.intel.com>:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> Even though the inactive pipes should have their watermarks set to all 0
> with enable=true, we can possibly shave off a few cycles by completely
> skipping the merge procedure for inactive pipes.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Reviewed-by: Paulo Zanoni <paulo.r.zanoni at Intel.com>

> ---
>  drivers/gpu/drm/i915/intel_pm.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index e0d1c8b..e13937f 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -2206,8 +2206,11 @@ static void ilk_merge_wm_level(struct drm_device *dev,
>         const struct intel_crtc *intel_crtc;
>
>         list_for_each_entry(intel_crtc, &dev->mode_config.crtc_list, base.head) {
> -               const struct intel_wm_level *wm =
> -                       &intel_crtc->wm.active.wm[level];
> +               const struct intel_pipe_wm *active = &intel_crtc->wm.active;
> +               const struct intel_wm_level *wm = &active->wm[level];
> +
> +               if (!active->pipe_enabled)
> +                       continue;
>
>                 if (!wm->enable)
>                         return;
> --
> 1.8.3.2
>
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-- 
Paulo Zanoni