On Mon, Apr 09, 2018 at 04:21:23PM +0200, Maarten Lankhorst wrote:
> The workaround was applied only to the primary plane, but is required
> on all planes. Iterate over all planes in the crtc atomic check to see
> if the workaround is enabled, and only perform the actual toggling in
> the pre/post plane update functions.
> 
> Changes since v1:
> - Track active NV12 planes in a nv12_planes bitmask. (Ville)
> 
> Signed-off-by: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_atomic_plane.c |  7 +++++-
>  drivers/gpu/drm/i915/intel_display.c      | 40 
> ++++++++++++++++++-------------
>  drivers/gpu/drm/i915/intel_drv.h          |  1 +
>  3 files changed, 30 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_atomic_plane.c 
> b/drivers/gpu/drm/i915/intel_atomic_plane.c
> index 7481ce85746b..6d068786eb41 100644
> --- a/drivers/gpu/drm/i915/intel_atomic_plane.c
> +++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
> @@ -183,11 +183,16 @@ int intel_plane_atomic_check_with_state(const struct 
> intel_crtc_state *old_crtc_
>       }
>  
>       /* FIXME pre-g4x don't work like this */
> -     if (intel_state->base.visible)
> +     if (state->visible)
>               crtc_state->active_planes |= BIT(intel_plane->id);
>       else
>               crtc_state->active_planes &= ~BIT(intel_plane->id);
>  
> +     if (state->visible && state->fb->format->format == DRM_FORMAT_NV12)
> +             crtc_state->nv12_planes |= BIT(intel_plane->id);
> +     else
> +             crtc_state->nv12_planes &= ~BIT(intel_plane->id);
> +
>       return intel_plane_atomic_calc_changes(old_crtc_state,
>                                              &crtc_state->base,
>                                              old_plane_state,
> diff --git a/drivers/gpu/drm/i915/intel_display.c 
> b/drivers/gpu/drm/i915/intel_display.c
> index 487a6e235222..3039d00546c2 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -5138,6 +5138,19 @@ static bool hsw_post_update_enable_ips(const struct 
> intel_crtc_state *old_crtc_s
>       return !old_crtc_state->ips_enabled;
>  }
>  
> +static bool needs_nv12_wa(struct drm_i915_private *dev_priv,
> +                       const struct intel_crtc_state *crtc_state)
> +{
> +     if (!crtc_state->nv12_planes)
> +             return false;
> +
> +     if ((INTEL_GEN(dev_priv) == 9 && !IS_GEMINILAKE(dev_priv)) ||
> +            IS_CANNONLAKE(dev_priv))
> +             return true;
> +
> +     return false;
> +}
> +
>  static void intel_post_plane_update(struct intel_crtc_state *old_crtc_state)
>  {
>       struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->base.crtc);
> @@ -5162,7 +5175,6 @@ static void intel_post_plane_update(struct 
> intel_crtc_state *old_crtc_state)
>       if (old_primary_state) {
>               struct drm_plane_state *new_primary_state =
>                       drm_atomic_get_new_plane_state(old_state, primary);
> -             struct drm_framebuffer *fb = new_primary_state->fb;
>  
>               intel_fbc_post_update(crtc);
>  
> @@ -5170,15 +5182,12 @@ static void intel_post_plane_update(struct 
> intel_crtc_state *old_crtc_state)
>                   (needs_modeset(&pipe_config->base) ||
>                    !old_primary_state->visible))
>                       intel_post_enable_primary(&crtc->base, pipe_config);
> -
> -             /* Display WA 827 */
> -             if ((INTEL_GEN(dev_priv) == 9 && !IS_GEMINILAKE(dev_priv)) ||
> -                 IS_CANNONLAKE(dev_priv)) {
> -                     if (fb && fb->format->format == DRM_FORMAT_NV12)
> -                             skl_wa_clkgate(dev_priv, crtc->pipe, false);
> -             }
> -
>       }
> +
> +     /* Display WA 827 */
> +     if (needs_nv12_wa(dev_priv, old_crtc_state) &&
> +         !needs_nv12_wa(dev_priv, pipe_config))
> +             skl_wa_clkgate(dev_priv, crtc->pipe, false);
>  }
>  
>  static void intel_pre_plane_update(struct intel_crtc_state *old_crtc_state,
> @@ -5202,14 +5211,6 @@ static void intel_pre_plane_update(struct 
> intel_crtc_state *old_crtc_state,
>               struct intel_plane_state *new_primary_state =
>                       intel_atomic_get_new_plane_state(old_intel_state,
>                                                        
> to_intel_plane(primary));
> -             struct drm_framebuffer *fb = new_primary_state->base.fb;
> -
> -             /* Display WA 827 */
> -             if ((INTEL_GEN(dev_priv) == 9 && !IS_GEMINILAKE(dev_priv)) ||
> -                 IS_CANNONLAKE(dev_priv)) {
> -                     if (fb && fb->format->format == DRM_FORMAT_NV12)
> -                             skl_wa_clkgate(dev_priv, crtc->pipe, true);
> -             }
>  
>               intel_fbc_pre_update(crtc, pipe_config, new_primary_state);
>               /*
> @@ -5221,6 +5222,11 @@ static void intel_pre_plane_update(struct 
> intel_crtc_state *old_crtc_state,
>                       intel_set_cpu_fifo_underrun_reporting(dev_priv, 
> crtc->pipe, false);
>       }
>  
> +     /* Display WA 827 */
> +     if (!needs_nv12_wa(dev_priv, old_crtc_state) &&
> +         needs_nv12_wa(dev_priv, pipe_config))
> +             skl_wa_clkgate(dev_priv, crtc->pipe, true);

That function name is pretty non-descriptive. What w/a? Oh, and the
implementation looks somewhat bogus as well. It's using rmw for
disable, but no rmw for enable. Someone may want to fix that up a bit
as well.

This patch lgtm
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>


> +
>       /*
>        * Vblank time updates from the shadow to live plane control register
>        * are blocked if the memory self-refresh mode is active at that
> diff --git a/drivers/gpu/drm/i915/intel_drv.h 
> b/drivers/gpu/drm/i915/intel_drv.h
> index 9969309132d0..e6473d684607 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -882,6 +882,7 @@ struct intel_crtc_state {
>  
>       /* bitmask of visible planes (enum plane_id) */
>       u8 active_planes;
> +     u8 nv12_planes;
>  
>       /* HDMI scrambling status */
>       bool hdmi_scrambling;
> -- 
> 2.16.3

-- 
Ville Syrjälä
Intel OTC
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