Re: [Intel-gfx] [PATCH v2 3/3] drm/i915/dp: Add all tiled and port sync conns to modeset

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

On Sun, Feb 02, 2020 at 11:47:56PM -0800, Manasi Navare wrote:
> If one of the synced crtcs needs a full modeset, we need
> to make sure all the synced crtcs are forced a full
> modeset.
> 
> v2:
> * Add tiles based on cpu_trans check (Ville)
> 
> Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_display.c |  85 -----------
>  drivers/gpu/drm/i915/display/intel_dp.c      | 142 ++++++++++++++++++-
>  2 files changed, 141 insertions(+), 86 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index a943787167de..6383d1287472 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -14669,76 +14669,6 @@ static bool intel_cpu_transcoders_need_modeset(struct intel_atomic_state *state,
>  	return false;
>  }
>  
> -static int
> -intel_modeset_all_tiles(struct intel_atomic_state *state, int tile_grp_id)
> -{
> -	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> -	struct drm_connector *connector;
> -	struct drm_connector_list_iter conn_iter;
> -	int ret = 0;
> -
> -	drm_connector_list_iter_begin(&dev_priv->drm, &conn_iter);
> -	drm_for_each_connector_iter(connector, &conn_iter) {
> -		struct drm_connector_state *conn_state;
> -		struct drm_crtc_state *crtc_state;
> -
> -		if (!connector->has_tile ||
> -		    connector->tile_group->id != tile_grp_id)
> -			continue;
> -		conn_state = drm_atomic_get_connector_state(&state->base,
> -							    connector);
> -		if (IS_ERR(conn_state)) {
> -			ret =  PTR_ERR(conn_state);
> -			break;
> -		}
> -
> -		if (!conn_state->crtc)
> -			continue;
> -
> -		crtc_state = drm_atomic_get_crtc_state(&state->base,
> -						       conn_state->crtc);
> -		if (IS_ERR(crtc_state)) {
> -			ret = PTR_ERR(crtc_state);
> -			break;
> -		}
> -		crtc_state->mode_changed = true;
> -		ret = drm_atomic_add_affected_connectors(&state->base,
> -							 conn_state->crtc);
> -		if (ret)
> -			break;
> -	}
> -	drm_connector_list_iter_end(&conn_iter);
> -
> -	return ret;
> -}
> -
> -static int
> -intel_atomic_check_tiled_conns(struct intel_atomic_state *state)
> -{
> -	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> -	struct drm_connector *connector;
> -	struct drm_connector_state *old_conn_state, *new_conn_state;
> -	int i, ret;
> -
> -	if (INTEL_GEN(dev_priv) < 11)
> -		return 0;
> -
> -	/* Is tiled, mark all other tiled CRTCs as needing a modeset */
> -	for_each_oldnew_connector_in_state(&state->base, connector,
> -					   old_conn_state, new_conn_state, i) {
> -		if (!connector->has_tile)
> -			continue;
> -		if (!intel_connector_needs_modeset(state, connector))
> -			continue;
> -
> -		ret = intel_modeset_all_tiles(state, connector->tile_group->id);
> -		if (ret)
> -			return ret;
> -	}
> -
> -	return 0;
> -}
> -
>  /**
>   * intel_atomic_check - validate state object
>   * @dev: drm device
> @@ -14767,21 +14697,6 @@ static int intel_atomic_check(struct drm_device *dev,
>  	if (ret)
>  		goto fail;
>  
> -	/**
> -	 * This check adds all the connectors in current state that belong to
> -	 * the same tile group to a full modeset.
> -	 * This function directly sets the mode_changed to true and we also call
> -	 * drm_atomic_add_affected_connectors(). Hence we are not explicitly
> -	 * calling drm_atomic_helper_check_modeset() after this.
> -	 *
> -	 * Fixme: Handle some corner cases where one of the
> -	 * tiled connectors gets disconnected and tile info is lost but since it
> -	 * was previously synced to other conn, we need to add that to the modeset.
> -	 */
> -	ret = intel_atomic_check_tiled_conns(state);
> -	if (ret)
> -		goto fail;
> -
>  	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
>  					    new_crtc_state, i) {
>  		if (!needs_modeset(new_crtc_state)) {
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index f4dede6253f8..07f0374d4409 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -6582,6 +6582,146 @@ void intel_dp_encoder_reset(struct drm_encoder *encoder)
>  	}
>  }
>  
> +static int intel_modeset_tile_group(struct intel_atomic_state *state,
> +				    int tile_group_id)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> +	struct drm_connector_list_iter conn_iter;
> +	struct drm_connector *connector;
> +	int ret = 0;
> +
> +	drm_connector_list_iter_begin(&dev_priv->drm, &conn_iter);
> +	drm_for_each_connector_iter(connector, &conn_iter) {
> +		struct drm_connector_state *conn_state;
> +		struct intel_crtc_state *crtc_state;
> +		struct intel_crtc *crtc;
> +
> +		if (!connector->has_tile ||
> +		    connector->tile_group->id != tile_group_id)
> +			continue;
> +
> +		conn_state = drm_atomic_get_connector_state(&state->base,
> +							    connector);
> +		if (IS_ERR(conn_state)) {
> +			ret = PTR_ERR(conn_state);
> +			break;
> +		}
> +
> +		crtc = to_intel_crtc(conn_state->crtc);
> +
> +		if (!crtc)
> +			continue;
> +
> +		crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);

I think this could just be get_new_crtc_state() since
drm_atomic_get_connector_state() should have added the
connector's crtc already to the state. Which would let us
get rid of the error handling here.

> +		if (IS_ERR(crtc_state)) {
> +			ret = PTR_ERR(crtc_state);
> +			break;
> +		}
> +
> +		crtc_state->uapi.mode_changed = true;
> +
> +		ret = drm_atomic_add_affected_planes(&state->base, &crtc->base);
> +		if (ret)
> +			break;
> +	}
> +	drm_connector_list_iter_begin(&dev_priv->drm, &conn_iter);
> +
> +	return ret;
> +}
> +
> +static int intel_modeset_affected_transcoders(struct intel_atomic_state *state, u8 transcoders)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> +	struct intel_crtc *crtc;
> +
> +	if (transcoders == 0)
> +		return 0;
> +
> +	for_each_intel_crtc(&dev_priv->drm, crtc) {
> +		struct intel_crtc_state *crtc_state;
> +		int ret;
> +
> +		crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
> +		if (IS_ERR(crtc_state))
> +			return PTR_ERR(crtc_state);
> +
> +		if (!crtc_state->hw.enable)
> +			continue;
> +
> +		if (!(transcoders & BIT(crtc_state->cpu_transcoder)))
> +			continue;
> +
> +		crtc_state->uapi.mode_changed = true;
> +
> +		ret = drm_atomic_add_affected_connectors(&state->base, &crtc->base);
> +		if (ret)
> +			return ret;
> +
> +		ret = drm_atomic_add_affected_planes(&state->base, &crtc->base);
> +		if (ret)
> +			return ret;
> +
> +		transcoders &= ~BIT(crtc_state->cpu_transcoder);
> +	}
> +
> +	WARN_ON(transcoders != 0);
> +
> +	return 0;
> +}
> +
> +static int intel_modeset_synced_crtcs(struct intel_atomic_state *state,
> +				      struct drm_connector *connector)
> +{
> +	const struct drm_connector_state *old_conn_state =
> +		drm_atomic_get_old_connector_state(&state->base, connector);
> +	const struct intel_crtc_state *old_crtc_state;
> +	struct intel_crtc *crtc;
> +	u8 transcoders;
> +
> +	crtc = to_intel_crtc(old_conn_state->crtc);
> +	if (!crtc)
> +		return 0;
> +
> +	old_crtc_state = intel_atomic_get_old_crtc_state(state, crtc);
> +
> +	if (!old_crtc_state->hw.active)
> +		return 0;
> +
> +	transcoders = old_crtc_state->sync_mode_slaves_mask;
> +	if (old_crtc_state->master_transcoder != INVALID_TRANSCODER)
> +		transcoders |= BIT(old_crtc_state->master_transcoder);
> +
> +	return intel_modeset_affected_transcoders(state,
> +						  transcoders &
> +						  ~BIT(old_crtc_state->cpu_transcoder));

As I said in the previous review cycle the '&~BIT(cpu_trans)' should
be a nop. So can just drop it.

Otherwise
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

> +}
> +
> +static int intel_dp_connector_atomic_check(struct drm_connector *conn,
> +					   struct drm_atomic_state *_state)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(conn->dev);
> +	struct intel_atomic_state *state = to_intel_atomic_state(_state);
> +	int ret;
> +
> +	ret = intel_digital_connector_atomic_check(conn, &state->base);
> +	if (ret)
> +		return ret;
> +
> +	if (INTEL_GEN(dev_priv) < 11)
> +		return 0;
> +
> +	if (!intel_connector_needs_modeset(state, conn))
> +		return 0;
> +
> +	if (conn->has_tile) {
> +		ret = intel_modeset_tile_group(state, conn->tile_group->id);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	return intel_modeset_synced_crtcs(state, conn);
> +}
> +
>  static const struct drm_connector_funcs intel_dp_connector_funcs = {
>  	.force = intel_dp_force,
>  	.fill_modes = drm_helper_probe_single_connector_modes,
> @@ -6598,7 +6738,7 @@ static const struct drm_connector_helper_funcs intel_dp_connector_helper_funcs =
>  	.detect_ctx = intel_dp_detect,
>  	.get_modes = intel_dp_get_modes,
>  	.mode_valid = intel_dp_mode_valid,
> -	.atomic_check = intel_digital_connector_atomic_check,
> +	.atomic_check = intel_dp_connector_atomic_check,
>  };
>  
>  static const struct drm_encoder_funcs intel_dp_enc_funcs = {
> -- 
> 2.19.1

-- 
Ville Syrjälä
Intel
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