Re: [PATCH v5 5/6] drm/i915: Move CRTC updating in atomic_commit into it's own hook

[Matt Roper]

On Tue, Aug 02, 2016 at 02:52:53PM -0400, Lyude wrote:
> Since we have to write ddb allocations at the same time as we do other
> plane updates, we're going to need to be able to control the order in
> which we execute modesets on each pipe. The easiest way to do this is to
> just factor this section of intel_atomic_commit_tail()
> (intel_atomic_commit() for stable branches) into it's own function, and
> add an appropriate display function hook for it.
> 
> Based off of Matt Rope's suggestions
> 
> Signed-off-by: Lyude <cpaul@xxxxxxxxxx>
> [omitting CC for stable, since this patch will need to be changed for
> such backports first]
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> Cc: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>
> Cc: Hans de Goede <hdegoede@xxxxxxxxxx>
> Cc: Matt Roper <matthew.d.roper@xxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/i915_drv.h      |  2 +
>  drivers/gpu/drm/i915/intel_display.c | 74 +++++++++++++++++++++++++-----------
>  2 files changed, 54 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 87018d3..4964e3f 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -632,6 +632,8 @@ struct drm_i915_display_funcs {
>  				  struct intel_crtc_state *crtc_state);
>  	void (*crtc_enable)(struct drm_crtc *crtc);
>  	void (*crtc_disable)(struct drm_crtc *crtc);
> +	void (*update_crtcs)(struct drm_atomic_state *state,
> +			     unsigned int *crtc_vblank_mask);
>  	void (*audio_codec_enable)(struct drm_connector *connector,
>  				   struct intel_encoder *encoder,
>  				   const struct drm_display_mode *adjusted_mode);
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 79d146c..d985b5b 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -13624,6 +13624,52 @@ static bool needs_vblank_wait(struct intel_crtc_state *crtc_state)
>  	return false;
>  }
>  
> +static void intel_update_crtc(struct drm_crtc *crtc,
> +			      struct drm_atomic_state *state,
> +			      struct drm_crtc_state *old_crtc_state,
> +			      unsigned int *crtc_vblank_mask)
> +{
> +	struct drm_device *dev = crtc->dev;
> +	struct drm_i915_private *dev_priv = to_i915(dev);
> +	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> +	struct intel_crtc_state *pipe_config = to_intel_crtc_state(crtc->state);
> +	bool modeset = needs_modeset(crtc->state);
> +
> +	if (modeset) {
> +		update_scanline_offset(intel_crtc);
> +		dev_priv->display.crtc_enable(crtc);
> +	} else {
> +		intel_pre_plane_update(to_intel_crtc_state(old_crtc_state));
> +	}
> +
> +	if (drm_atomic_get_existing_plane_state(state, crtc->primary)) {
> +		intel_fbc_enable(
> +		    intel_crtc, pipe_config,
> +		    to_intel_plane_state(crtc->primary->state));
> +	}
> +
> +	drm_atomic_helper_commit_planes_on_crtc(old_crtc_state);
> +
> +	if (pipe_config->base.active && needs_vblank_wait(pipe_config))

You can drop the pipe_config->base.active since pipe_config->base.active
is just another way of writing crtc->state->active, which you tested
before calling this function.

Other than that,

Reviewed-by: Matt Roper <matthew.d.roper@xxxxxxxxx>

> +		*crtc_vblank_mask |= drm_crtc_mask(crtc);
> +}
> +
> +static void intel_update_crtcs(struct drm_atomic_state *state,
> +			       unsigned int *crtc_vblank_mask)
> +{
> +	struct drm_crtc *crtc;
> +	struct drm_crtc_state *old_crtc_state;
> +	int i;
> +
> +	for_each_crtc_in_state(state, crtc, old_crtc_state, i) {
> +		if (!crtc->state->active)
> +			continue;
> +
> +		intel_update_crtc(crtc, state, old_crtc_state,
> +				  crtc_vblank_mask);
> +	}
> +}
> +
>  static void intel_atomic_commit_tail(struct drm_atomic_state *state)
>  {
>  	struct drm_device *dev = state->dev;
> @@ -13715,17 +13761,9 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state)
>  		intel_modeset_verify_disabled(dev);
>  	}
>  
> -	/* Now enable the clocks, plane, pipe, and connectors that we set up. */
> +	/* Complete the events for pipes that have now been disabled */
>  	for_each_crtc_in_state(state, crtc, old_crtc_state, i) {
> -		struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
>  		bool modeset = needs_modeset(crtc->state);
> -		struct intel_crtc_state *pipe_config =
> -			to_intel_crtc_state(crtc->state);
> -
> -		if (modeset && crtc->state->active) {
> -			update_scanline_offset(to_intel_crtc(crtc));
> -			dev_priv->display.crtc_enable(crtc);
> -		}
>  
>  		/* Complete events for now disable pipes here. */
>  		if (modeset && !crtc->state->active && crtc->state->event) {
> @@ -13735,21 +13773,11 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state)
>  
>  			crtc->state->event = NULL;
>  		}
> -
> -		if (!modeset)
> -			intel_pre_plane_update(to_intel_crtc_state(old_crtc_state));
> -
> -		if (crtc->state->active &&
> -		    drm_atomic_get_existing_plane_state(state, crtc->primary))
> -			intel_fbc_enable(intel_crtc, pipe_config, to_intel_plane_state(crtc->primary->state));
> -
> -		if (crtc->state->active)
> -			drm_atomic_helper_commit_planes_on_crtc(old_crtc_state);
> -
> -		if (pipe_config->base.active && needs_vblank_wait(pipe_config))
> -			crtc_vblank_mask |= 1 << i;
>  	}
>  
> +	/* Now enable the clocks, plane, pipe, and connectors that we set up. */
> +	dev_priv->display.update_crtcs(state, &crtc_vblank_mask);
> +
>  	/* FIXME: We should call drm_atomic_helper_commit_hw_done() here
>  	 * already, but still need the state for the delayed optimization. To
>  	 * fix this:
> @@ -15202,6 +15230,8 @@ void intel_init_display_hooks(struct drm_i915_private *dev_priv)
>  		dev_priv->display.crtc_disable = i9xx_crtc_disable;
>  	}
>  
> +	dev_priv->display.update_crtcs = intel_update_crtcs;
> +
>  	/* Returns the core display clock speed */
>  	if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv))
>  		dev_priv->display.get_display_clock_speed =
> -- 
> 2.7.4
> 

-- 
Matt Roper
Graphics Software Engineer
IoTG Platform Enabling & Development
Intel Corporation
(916) 356-2795