Commit 34f66763 authored by Hamza Mahfooz's avatar Hamza Mahfooz Committed by Alex Deucher
Browse files

drm/dp_mst: add passthrough_aux to struct drm_dp_mst_port 



Currently, there is no way to identify if DSC pass-through can be
enabled and what aux DSC pass-through requests ought to be sent to. So,
add a variable to struct drm_dp_mst_port that keeps track of the
aforementioned information.

Reviewed-by: default avatarLyude Paul <lyude@redhat.com>
Signed-off-by: default avatarHamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 33fa4f1d

drivers/gpu/drm/display/drm_dp_mst_topology.c

+3 −1
Original line number Diff line number Diff line
@@ -5908,8 +5908,10 @@ struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port) 
		/* Enpoint decompression with DP-to-DP peer device */

		if ((endpoint_dsc & DP_DSC_DECOMPRESSION_IS_SUPPORTED) &&

		    (endpoint_fec & DP_FEC_CAPABLE) &&

		    (upstream_dsc & 0x2) /* DSC passthrough */)

		    (upstream_dsc & DP_DSC_PASSTHROUGH_IS_SUPPORTED)) {

			port->passthrough_aux = &immediate_upstream_port->aux;

			return &port->aux;

		}



		/* Virtual DPCD decompression with DP-to-DP peer device */

		return &immediate_upstream_port->aux;

include/drm/display/drm_dp.h

+1 −0
Original line number Diff line number Diff line
@@ -239,6 +239,7 @@ 


#define DP_DSC_SUPPORT                      0x060   /* DP 1.4 */

# define DP_DSC_DECOMPRESSION_IS_SUPPORTED  (1 << 0)

# define DP_DSC_PASSTHROUGH_IS_SUPPORTED    (1 << 1)



#define DP_DSC_REV                          0x061

# define DP_DSC_MAJOR_MASK                  (0xf << 0)

include/drm/display/drm_dp_mst_helper.h

+3 −0
Original line number Diff line number Diff line
@@ -86,6 +86,8 @@ struct drm_dp_vcpi { 
 * @next: link to next port on this branch device

 * @aux: i2c aux transport to talk to device connected to this port, protected

 * by &drm_dp_mst_topology_mgr.base.lock.

 * @passthrough_aux: parent aux to which DSC pass-through requests should be

 * sent, only set if DSC pass-through is possible.

 * @parent: branch device parent of this port

 * @vcpi: Virtual Channel Payload info for this port.

 * @connector: DRM connector this port is connected to. Protected by
@@ -140,6 +142,7 @@ struct drm_dp_mst_port { 
	 */

	struct drm_dp_mst_branch *mstb;

	struct drm_dp_aux aux; /* i2c bus for this port? */

	struct drm_dp_aux *passthrough_aux;

	struct drm_dp_mst_branch *parent;



	struct drm_dp_vcpi vcpi;