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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: Lyude Paul <lyude@redhat.com>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Hamza Mahfooz 2022-08-04 14:06:55 -04:00 committed by Alex Deucher
parent 33fa4f1df5
commit 34f667634a
3 changed files with 7 additions and 1 deletions
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4
drivers/gpu/drm/display/drm_dp_mst_topology.c
View File

@ -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;

1
include/drm/display/drm_dp.h
View File

@ -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)

3
include/drm/display/drm_dp_mst_helper.h
View File

@ -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;