Re: [CI 01/12] drm/i915: Introduce intel_atomic_get_plane_state_after_check(), v2.

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

On Wed, Oct 30, 2019 at 10:17:52AM +0100, Maarten Lankhorst wrote:
> Op 29-10-2019 om 19:35 schreef Ville Syrjälä:
> > On Tue, Oct 29, 2019 at 08:22:18AM +0100, Maarten Lankhorst wrote:
> >> Use this in all the places where we try to acquire planes after the planes
> >> atomic_check().
> >>
> >> In case of intel_modeset_all_pipes() this is not yet done after atomic_check,
> >> but seems like it will be in the future. To add some paranoia, add all planes
> >> rather than active planes, because of bigjoiner and planar YUV support having
> >> extra planes outside of the core's view that wouldn't be added otherwise.
> >>
> >> Changes since v1:
> >> - Always add all planes, to handle force plane updates to work correctly
> >>   with a disabled cursor plane.
> >>
> >> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> >> ---
> >>  drivers/gpu/drm/i915/display/intel_atomic.c   | 41 +++++++++----------
> >>  .../gpu/drm/i915/display/intel_atomic_plane.c | 15 +++++++
> >>  drivers/gpu/drm/i915/display/intel_cdclk.c    | 15 ++++---
> >>  drivers/gpu/drm/i915/display/intel_color.c    |  7 ++--
> >>  .../drm/i915/display/intel_display_types.h    |  6 +++
> >>  drivers/gpu/drm/i915/intel_pm.c               | 14 ++++---
> >>  6 files changed, 62 insertions(+), 36 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
> >> index 9cd6d2348a1e..80df6c233581 100644
> >> --- a/drivers/gpu/drm/i915/display/intel_atomic.c
> >> +++ b/drivers/gpu/drm/i915/display/intel_atomic.c
> >> @@ -313,13 +313,10 @@ int intel_atomic_setup_scalers(struct drm_i915_private *dev_priv,
> >>  			       struct intel_crtc *intel_crtc,
> >>  			       struct intel_crtc_state *crtc_state)
> >>  {
> >> -	struct drm_plane *plane = NULL;
> >> -	struct intel_plane *intel_plane;
> >> -	struct intel_plane_state *plane_state = NULL;
> >>  	struct intel_crtc_scaler_state *scaler_state =
> >>  		&crtc_state->scaler_state;
> >>  	struct drm_atomic_state *drm_state = crtc_state->base.state;
> >> -	struct intel_atomic_state *intel_state = to_intel_atomic_state(drm_state);
> >> +	struct intel_atomic_state *state = to_intel_atomic_state(drm_state);
> >>  	int num_scalers_need;
> >>  	int i;
> >>  
> >> @@ -346,6 +343,7 @@ int intel_atomic_setup_scalers(struct drm_i915_private *dev_priv,
> >>  
> >>  	/* walkthrough scaler_users bits and start assigning scalers */
> >>  	for (i = 0; i < sizeof(scaler_state->scaler_users) * 8; i++) {
> >> +		struct intel_plane_state *plane_state = NULL;
> >>  		int *scaler_id;
> >>  		const char *name;
> >>  		int idx;
> >> @@ -361,19 +359,16 @@ int intel_atomic_setup_scalers(struct drm_i915_private *dev_priv,
> >>  			/* panel fitter case: assign as a crtc scaler */
> >>  			scaler_id = &scaler_state->scaler_id;
> >>  		} else {
> >> -			name = "PLANE";
> >> +			struct intel_plane *plane;
> >>  
> >>  			/* plane scaler case: assign as a plane scaler */
> >>  			/* find the plane that set the bit as scaler_user */
> >> -			plane = drm_state->planes[i].ptr;
> >>  
> >>  			/*
> >>  			 * to enable/disable hq mode, add planes that are using scaler
> >>  			 * into this transaction
> >>  			 */
> >> -			if (!plane) {
> >> -				struct drm_plane_state *state;
> >> -
> >> +			if (!drm_state->planes[i].ptr) {
> >>  				/*
> >>  				 * GLK+ scalers don't have a HQ mode so it
> >>  				 * isn't necessary to change between HQ and dyn mode
> >> @@ -382,24 +377,28 @@ int intel_atomic_setup_scalers(struct drm_i915_private *dev_priv,
> >>  				if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
> >>  					continue;
> >>  
> >> -				plane = drm_plane_from_index(&dev_priv->drm, i);
> >> -				state = drm_atomic_get_plane_state(drm_state, plane);
> >> -				if (IS_ERR(state)) {
> >> -					DRM_DEBUG_KMS("Failed to add [PLANE:%d] to drm_state\n",
> >> -						plane->base.id);
> >> -					return PTR_ERR(state);
> >> +				plane = to_intel_plane(drm_plane_from_index(&dev_priv->drm, i));
> >> +				plane_state =
> >> +					intel_atomic_get_plane_state_after_check(state,
> >> +										 crtc_state,
> >> +										 plane);
> >> +				if (IS_ERR(plane_state)) {
> >> +					DRM_DEBUG_KMS("Failed to add [PLANE:%d] to drm_state: %li\n",
> >> +						plane->base.base.id, PTR_ERR(plane_state));
> >> +					return PTR_ERR(plane_state);
> >>  				}
> >> +			} else {
> >> +				plane = to_intel_plane(drm_state->planes[i].ptr);
> >> +				plane_state = intel_atomic_get_new_plane_state(state,
> >> +									       plane);
> >>  			}
> >>  
> >> -			intel_plane = to_intel_plane(plane);
> >> -			idx = plane->base.id;
> >> -
> >>  			/* plane on different crtc cannot be a scaler user of this crtc */
> >> -			if (WARN_ON(intel_plane->pipe != intel_crtc->pipe))
> >> +			if (WARN_ON(plane->pipe != intel_crtc->pipe))
> >>  				continue;
> >>  
> >> -			plane_state = intel_atomic_get_new_plane_state(intel_state,
> >> -								       intel_plane);
> >> +			name = "PLANE";
> >> +			idx = plane->base.base.id;
> >>  			scaler_id = &plane_state->scaler_id;
> >>  		}
> >>  
> >> diff --git a/drivers/gpu/drm/i915/display/intel_atomic_plane.c b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
> >> index 98f557a9f8ee..a9e2684c6b6d 100644
> >> --- a/drivers/gpu/drm/i915/display/intel_atomic_plane.c
> >> +++ b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
> >> @@ -402,6 +402,21 @@ void i9xx_update_planes_on_crtc(struct intel_atomic_state *state,
> >>  	}
> >>  }
> >>  
> >> +struct intel_plane_state *
> >> +intel_atomic_get_plane_state_after_check(struct intel_atomic_state *state,
> >> +					 struct intel_crtc_state *new_crtc_state,
> >> +					 struct intel_plane *plane)
> >> +{
> >> +	struct intel_plane_state *plane_state =
> >> +		intel_atomic_get_plane_state(state, plane);
> >> +
> >> +	if (IS_ERR(plane_state))
> >> +		return plane_state;
> >> +
> >> +	new_crtc_state->update_planes |= BIT(plane->id);
> >> +	return plane_state;
> >> +}
> > With the hw state being persistent now I guess we don't need this
> > anymore?
> 
> Yes, it would stil be useful for annotation though. :)

To me it seems to just hide things (the update_planes bitmask
adjustment), so it's not at all ovbvious for the reader that
calling this will result in the plane registers really getting
programmed.

-- 
Ville Syrjälä
Intel
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