xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

drm/dp_mst: Add helpers for MST DSC and virtual DPCD aux

Browse Source 
Add drm_dp_mst_dsc_aux_for_port. To enable DSC, the DSC_ENABLED
register might have to be written on the leaf port's DPCD,
its parent's DPCD, or the MST manager's DPCD. This function
finds the correct aux for the job.

As part of this, add drm_dp_mst_is_virtual_dpcd. Virtual DPCD
is a DP feature new in DP v1.4, which exposes certain DPCD
registers on virtual ports.

v2: Remember to unlock mutex on all paths
v3: Refactor to match coding style and increase brevity
v4: - Check DSC capable MST sink connected directly to the device.
    - Check branch's port_parent to be set

Cc: Lyude Paul <lyude@redhat.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Signed-off-by: David Francis <David.Francis@amd.com>
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
David Francis
2019-08-26 09:50:28 -04:00
committed by Alex Deucher
parent b1dee9a716
commit c2bc1b6eab
2 changed files with 145 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
include/drm/drm_dp_mst_helper.h
View File

@@ -791,6 +791,8 @@ int __must_check drm_dp_mst_atomic_check(struct drm_atomic_state *state);
void drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port);
void drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port);
struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port);
extern const struct drm_private_state_funcs drm_dp_mst_topology_state_funcs;
/**