Re: [PATCH] drm/i915: add missing condition for committing planes on crtc

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Wed, May 04, 2016 at 02:40:34PM +0100, Lionel Landwerlin wrote:
> We are currently missing the color management update condition to
> commit planes on crtc.
> 
> v2: add comment about moving the commit of color management registers
>     to an async worker
> 
> v3: Commit color management register right after vblank
> 
> Fixes: 20a34e78f0d7 (drm/i915: Update color management during vblank evasion.)
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Jani Nikula <jani.nikula@intel.com>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 45c218d..c6acfe5 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -13688,6 +13688,11 @@ static int intel_atomic_commit(struct drm_device *dev,
>  
>  		if (dev_priv->display.optimize_watermarks)
>  			dev_priv->display.optimize_watermarks(intel_cstate);
> +
> +		if (crtc->state->color_mgmt_changed) {
> +			intel_color_set_csc(crtc->state);

As I said earlier, csc shouldn't be here, at least on pch
platforms. And someone should actually double check whether
vlv/chv have double buffered csc registers or not. Oh and
with these frankensocs the double buffering scheme used 
(if any) might be totally crazy, like it is for the pipe B
primary plane scaler on chv. A fact which the spec fails
to explain IIRC. So I'd recommend poking at the hardware
to figure out how it actually works.

> +			intel_color_load_luts(crtc->state);
> +		}
>  	}
>  
>  	for_each_crtc_in_state(state, crtc, old_crtc_state, i) {
> -- 
> 2.8.0.rc3.226.g39d4020

-- 
Ville Syrjälä
Intel OTC
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