Commit 751dbac1 authored by Imre Deak's avatar Imre Deak
Browse files

drm/i915/dp_mst: Enable DSC passthrough 



Enable passing through DSC streams to the sink in last branch devices.

v2:
- Fix the DPCD register address while setting/clearing the passthrough
  flag.

Reviewed-by: default avatarStanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarImre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231030155843.2251023-25-imre.deak@intel.com
parent 7c4631ff

drivers/gpu/drm/i915/display/intel_dp.c

+20 −2
Original line number Diff line number Diff line
@@ -2968,6 +2968,24 @@ intel_dp_sink_set_dsc_decompression(struct intel_connector *connector, 
			    str_enable_disable(enable));

}



static void

intel_dp_sink_set_dsc_passthrough(const struct intel_connector *connector,

				  bool enable)

{

	struct drm_i915_private *i915 = to_i915(connector->base.dev);

	struct drm_dp_aux *aux = connector->port ?

				 connector->port->passthrough_aux : NULL;



	if (!aux)

		return;



	if (write_dsc_decompression_flag(aux,

					 DP_DSC_PASSTHROUGH_EN, enable) < 0)

		drm_dbg_kms(&i915->drm,

			    "Failed to %s sink compression passthrough state\n",

			    str_enable_disable(enable));

}



/**

 * intel_dp_sink_enable_decompression - Enable DSC decompression in sink/last branch device

 * @state: atomic state
@@ -2994,7 +3012,7 @@ void intel_dp_sink_enable_decompression(struct intel_atomic_state *state, 
			!connector->dp.dsc_decompression_aux))

		return;



	/* TODO: Enable passthrough in the MST last branch device if needed. */

	intel_dp_sink_set_dsc_passthrough(connector, true);

	intel_dp_sink_set_dsc_decompression(connector, true);

}
@@ -3022,7 +3040,7 @@ void intel_dp_sink_disable_decompression(struct intel_atomic_state *state, 
		return;



	intel_dp_sink_set_dsc_decompression(connector, false);

	/* TODO: Disable passthrough in the MST last branch device if needed. */

	intel_dp_sink_set_dsc_passthrough(connector, false);

}



static void