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drm/amd/display: Cache streams targeting link when performing LT automation

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[WHY]
Last LT automation update can cause crash by referencing current_state and
calling into dc_update_planes_and_stream which may clobber current_state.

[HOW]
Cache relevant stream pointers and iterate through them instead of relying
on the current_state.

Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Michael Strauss <michael.strauss@amd.com>
Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Michael Strauss
2025-07-17 16:18:58 -04:00
committed by Alex Deucher
parent 327aba7f55
commit f5b69101f9
1 changed files with 14 additions and 4 deletions
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18
drivers/gpu/drm/amd/display/dc/link/accessories/link_dp_cts.c
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@@ -76,6 +76,9 @@ static void dp_retrain_link_dp_test(struct dc_link *link,
uint8_t count;
int i;
struct dc_stream_state *streams_on_link[MAX_PIPES];
int num_streams_on_link = 0;
needs_divider_update = (link->dc->link_srv->dp_get_encoding_format(link_setting) !=
link->dc->link_srv->dp_get_encoding_format((const struct dc_link_settings *) &link->cur_link_settings));
@@ -138,12 +141,19 @@ static void dp_retrain_link_dp_test(struct dc_link *link,
pipes[i]->stream_res.tg->funcs->enable_crtc(pipes[i]->stream_res.tg);
// Set DPMS on with stream update
for (i = 0; i < state->stream_count; i++)
if (state->streams[i] && state->streams[i]->link && state->streams[i]->link == link) {
stream_update.stream = state->streams[i];
// Cache all streams on current link since dc_update_planes_and_stream might kill current_state
for (i = 0; i < MAX_PIPES; i++) {
if (state->streams[i] && state->streams[i]->link && state->streams[i]->link == link)
streams_on_link[num_streams_on_link++] = state->streams[i];
}
for (i = 0; i < num_streams_on_link; i++) {
if (streams_on_link[i] && streams_on_link[i]->link && streams_on_link[i]->link == link) {
stream_update.stream = streams_on_link[i];
stream_update.dpms_off = &dpms_off;
dc_update_planes_and_stream(state->clk_mgr->ctx->dc, NULL, 0, state->streams[i], &stream_update);
dc_update_planes_and_stream(state->clk_mgr->ctx->dc, NULL, 0, streams_on_link[i], &stream_update);
}
}
}
static void dp_test_send_link_training(struct dc_link *link)