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drm/amd/display: Add affected crtcs to atomic state for dsc mst unplug 

[Why]
When display topology changed on DSC hub we add all crtcs with dsc support to
atomic state.
Refer to patch:"drm/amd/display: Trigger modesets on MST DSC connectors"
However the original implementation may skip crtc if the topology change
caused by unplug.
That potentially could lead to no-lightup or corruption on DSC hub after
unplug event on one of the connectors.

[How]
Update add_affected_mst_dsc_crtcs() to use old connector state
if new connector state has no crtc (undergoes modeset due to unplug)

Fixes: 44be939ff7 ("drm/amd/display: Trigger modesets on MST DSC connectors")

Reviewed-by: Hersen Wu <hersenwu@amd.com>
Acked-by: Jasdeep Dhillon <jdhillon@amd.com>
Signed-off-by: Roman Li <Roman.Li@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Roman Li 2021-12-23 17:39:57 -05:00 committed by Alex Deucher
parent d9f2303004
commit 128f8ed590
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View File

@ -10851,10 +10851,13 @@ static int dm_check_crtc_cursor(struct drm_atomic_state *state,
static int add_affected_mst_dsc_crtcs(struct drm_atomic_state *state, struct drm_crtc *crtc)
{
struct drm_connector *connector;
struct drm_connector_state *conn_state;
struct drm_connector_state *conn_state, *old_conn_state;
struct amdgpu_dm_connector *aconnector = NULL;
int i;
for_each_new_connector_in_state(state, connector, conn_state, i) {
for_each_oldnew_connector_in_state(state, connector, old_conn_state, conn_state, i) {
if (!conn_state->crtc)
conn_state = old_conn_state;
if (conn_state->crtc != crtc)
continue;