Re: [PATCH 09/14] drm/i915: Introduce crtc_state->update_planes bitmask

[Rodrigo Vivi <rodrigo.vivi@intel.com>]

On Thu, Nov 01, 2018 at 05:06:00PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> Keep track which planes need updating during the commit. For now this
> is just (was_visible || is_visible) but I'll have need to update
> invisible planes later on for skl plane ddbs and for pre-skl pipe
> gamma/csc control (which lives in the primary plane control register).
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_atomic.c       | 1 +
>  drivers/gpu/drm/i915/intel_atomic_plane.c | 8 ++++----
>  drivers/gpu/drm/i915/intel_display.c      | 5 ++++-
>  drivers/gpu/drm/i915/intel_drv.h          | 3 +++
>  4 files changed, 12 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
> index a5a2c8fe58a7..8cb02f28d30c 100644
> --- a/drivers/gpu/drm/i915/intel_atomic.c
> +++ b/drivers/gpu/drm/i915/intel_atomic.c
> @@ -184,6 +184,7 @@ intel_crtc_duplicate_state(struct drm_crtc *crtc)
>  	crtc_state->fifo_changed = false;
>  	crtc_state->wm.need_postvbl_update = false;
>  	crtc_state->fb_bits = 0;
> +	crtc_state->update_planes = 0;
>  
>  	return &crtc_state->base;
>  }
> diff --git a/drivers/gpu/drm/i915/intel_atomic_plane.c b/drivers/gpu/drm/i915/intel_atomic_plane.c
> index 7d3685075201..010269a12390 100644
> --- a/drivers/gpu/drm/i915/intel_atomic_plane.c
> +++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
> @@ -137,6 +137,9 @@ int intel_plane_atomic_check_with_state(const struct intel_crtc_state *old_crtc_
>  	if (state->visible && state->fb->format->format == DRM_FORMAT_NV12)
>  		crtc_state->nv12_planes |= BIT(intel_plane->id);
>  
> +	if (state->visible || old_plane_state->base.visible)
> +		crtc_state->update_planes |= BIT(intel_plane->id);
> +
>  	return intel_plane_atomic_calc_changes(old_crtc_state,
>  					       &crtc_state->base,
>  					       old_plane_state,
> @@ -171,14 +174,11 @@ void intel_update_planes_on_crtc(struct intel_atomic_state *old_state,
>  				 struct intel_crtc_state *old_crtc_state,
>  				 struct intel_crtc_state *new_crtc_state)
>  {
> +	u32 update_mask = new_crtc_state->update_planes;
>  	struct intel_plane_state *new_plane_state;
>  	struct intel_plane *plane;
> -	u32 update_mask;
>  	int i;
>  
> -	update_mask = old_crtc_state->active_planes;
> -	update_mask |= new_crtc_state->active_planes;
> -

maybe this useless update_mask removal deserved a separated patch,
but not a big deal...

>  	for_each_new_intel_plane_in_state(old_state, plane, new_plane_state, i) {
>  		if (crtc->pipe != plane->pipe ||
>  		    !(update_mask & BIT(plane->id)))
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 852b5897e80b..33d73915b73e 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -10797,8 +10797,10 @@ static int icl_check_nv12_planes(struct intel_crtc_state *crtc_state)
>  			continue;
>  
>  		plane_state->linked_plane = NULL;
> -		if (plane_state->slave && !plane_state->base.visible)
> +		if (plane_state->slave && !plane_state->base.visible) {
>  			crtc_state->active_planes &= ~BIT(plane->id);
> +			crtc_state->update_planes |= BIT(plane->id);
> +		}
>  
>  		plane_state->slave = false;
>  	}
> @@ -10839,6 +10841,7 @@ static int icl_check_nv12_planes(struct intel_crtc_state *crtc_state)
>  		linked_state->slave = true;
>  		linked_state->linked_plane = plane;
>  		crtc_state->active_planes |= BIT(linked->id);
> +		crtc_state->update_planes |= BIT(linked->id);
>  		DRM_DEBUG_KMS("Using %s as Y plane for %s\n", linked->base.name, plane->base.name);
>  	}
>  
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 5331bbed5e8c..7a55f5921d34 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -925,6 +925,9 @@ struct intel_crtc_state {
>  	u8 active_planes;
>  	u8 nv12_planes;
>  
> +	/* bitmask of planes that will be updated during the commit */

I noticed how bad we are with documentation compared to the rest of drm
structs :/

but I'm glad you added the explanation in the comment here.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

> +	u8 update_planes;
> +
>  	/* HDMI scrambling status */
>  	bool hdmi_scrambling;
>  
> -- 
> 2.18.1
> 
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