Re: [Intel-gfx] [PATCH v10 2/4] drm/i915: Move dbuf slice update to proper place

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

On Mon, Dec 23, 2019 at 05:45:20PM +0200, Stanislav Lisovskiy wrote:
> Current DBuf slices update wasn't done in proper
> place, especially its "post" part, which should
> disable those only once vblank had passed and
> all other changes are committed.
> 
> v2: Fix to use dev_priv and intel_atomic_state
>     instead of skl_ddb_values
>     (to be nuked in Villes patch)
> 
> v3: Renamed "enabled_slices" to "enabled_dbuf_slices_num"
>     (Matt Roper)
> 
> Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
> Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 38 ++++++++++++++------
>  1 file changed, 28 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index d009466cf444..bba7897d05d8 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -14515,13 +14515,33 @@ static void intel_update_trans_port_sync_crtcs(struct intel_crtc *crtc,
>  				       state);
>  }
>  
> +static void icl_dbuf_slice_pre_update(struct intel_atomic_state *state)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> +	u8 hw_enabled_slices = dev_priv->enabled_dbuf_slices_num;
> +	u8 required_slices = state->enabled_dbuf_slices_num;
> +
> +	/* If 2nd DBuf slice required, enable it here */
> +	if (INTEL_GEN(dev_priv) >= 11 && required_slices > hw_enabled_slices)
> +		icl_dbuf_slices_update(dev_priv, required_slices);
> +}
> +
> +static void icl_dbuf_slice_post_update(struct intel_atomic_state *state)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> +	u8 hw_enabled_slices = dev_priv->enabled_dbuf_slices_num;
> +	u8 required_slices = state->enabled_dbuf_slices_num;
> +
> +	/* If 2nd DBuf slice is no more required disable it */
> +	if (INTEL_GEN(dev_priv) >= 11 && required_slices < hw_enabled_slices)
> +		icl_dbuf_slices_update(dev_priv, required_slices);
> +}
> +
>  static void skl_commit_modeset_enables(struct intel_atomic_state *state)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
>  	struct intel_crtc *crtc;
>  	struct intel_crtc_state *old_crtc_state, *new_crtc_state;
> -	u8 hw_enabled_slices = dev_priv->enabled_dbuf_slices_num;
> -	u8 required_slices = state->enabled_dbuf_slices_num;
>  	struct skl_ddb_entry entries[I915_MAX_PIPES] = {};
>  	u8 dirty_pipes = 0;
>  	int i;
> @@ -14534,10 +14554,6 @@ static void skl_commit_modeset_enables(struct intel_atomic_state *state)
>  			dirty_pipes |= BIT(crtc->pipe);
>  	}
>  
> -	/* If 2nd DBuf slice required, enable it here */
> -	if (INTEL_GEN(dev_priv) >= 11 && required_slices > hw_enabled_slices)
> -		icl_dbuf_slices_update(dev_priv, required_slices);
> -
>  	/*
>  	 * Whenever the number of active pipes changes, we need to make sure we
>  	 * update the pipes in the right order so that their ddb allocations
> @@ -14586,10 +14602,6 @@ static void skl_commit_modeset_enables(struct intel_atomic_state *state)
>  				intel_wait_for_vblank(dev_priv, pipe);
>  		}
>  	}
> -
> -	/* If 2nd DBuf slice is no more required disable it */
> -	if (INTEL_GEN(dev_priv) >= 11 && required_slices < hw_enabled_slices)
> -		icl_dbuf_slices_update(dev_priv, required_slices);
>  }
>  
>  static void intel_atomic_helper_free_state(struct drm_i915_private *dev_priv)
> @@ -14719,6 +14731,9 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
>  	if (state->modeset)
>  		intel_encoders_update_prepare(state);
>  
> +	/* Enable all new slices, we might need */
> +	icl_dbuf_slice_pre_update(state);
> +
>  	/* Now enable the clocks, plane, pipe, and connectors that we set up. */
>  	dev_priv->display.commit_modeset_enables(state);
>  
> @@ -14794,6 +14809,9 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
>  	if (state->modeset && intel_can_enable_sagv(state))
>  		intel_enable_sagv(dev_priv);
>  
> +	/* Disable all slices, we don't need */
> +	icl_dbuf_slice_post_update(state);
> +

IIRC I previously suggested a bit better place for this.

>  	drm_atomic_helper_commit_hw_done(&state->base);
>  
>  	if (state->modeset) {
> -- 
> 2.24.1.485.gad05a3d8e5

-- 
Ville Syrjälä
Intel
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