[PATCH] drm/amd/display: restore FRL cap on non-destructive HDMI link verify

Restore the FRL verified cap from the reported cap so a link whose FRL
pre-training was skipped (e.g. skip_frl_pre_training) stays on FRL across
a hotplug instead of falling back to TMDS.

On hotplug the HDMI sink is recreated as SIGNAL_TYPE_HDMI_TYPE_A and only
the destructive verify path promotes it to FRL via hdmi_frl_verify_link_cap().
When the non-destructive path runs - which is what the skip_frl_pre_training
quirk forces on an already-active link - the HDMI branch mistakenly assigned
the DP verified_link_cap from reported_link_cap and left frl_verified_link_cap
stale. With frl_link_rate reading back as HDMI_FRL_LINK_RATE_DISABLE, the
stream collapsed to TMDS. Assign frl_verified_link_cap from frl_reported_link_cap
(populated during detection by hdmi_frl_retrieve_link_cap()) to match the
reference DM behavior and keep the link on FRL.

Signed-off-by: Fangzhi Zuo <[email protected]>
---
 drivers/gpu/drm/amd/display/dc/link/link_detection.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/link/link_detection.c b/drivers/gpu/drm/amd/display/dc/link/link_detection.c
index 22ad6a743038..1384197578ec 100644
--- a/drivers/gpu/drm/amd/display/dc/link/link_detection.c
+++ b/drivers/gpu/drm/amd/display/dc/link/link_detection.c
@@ -934,7 +934,7 @@ static void verify_link_capability_non_destructive(struct dc_link *link)
 		else
 			link->verified_link_cap = dp_get_max_link_cap(link);
 	} else if (dc_is_hdmi_signal(link->local_sink->sink_signal)) {
-		link->verified_link_cap = link->reported_link_cap;
+		link->frl_verified_link_cap = link->frl_reported_link_cap;
 
 		if (is_hdmi_frl_in_use(link)) {
 			link->local_sink->sink_signal = SIGNAL_TYPE_HDMI_TYPE_A;
-- 
2.53.0