drm/i915/dp: Reset frl trained flag before restarting FRL training

[ Upstream commit 63720a561b3c98199adf0c73e152807f15cc3b7f ]

For cases where DP has HDMI2.1 sink and FRL Link issues are detected,
reset the flag to state FRL trained status before restarting FRL
training.

Fixes: 9488a030ac91 ("drm/i915: Add support for enabling link status and recovery")
Cc: Swati Sharma <swati2.sharma@intel.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Cc: Uma Shankar <uma.shankar@intel.com> (v2)
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221011063447.904649-2-ankit.k.nautiyal@intel.com
(cherry picked from commit 47e1a59e60c688c5f95b67277202f05b7e84c189)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index f87e4d510ea5e6605c63a10c51ed922f97c7de64..1ccdf2da042bc6b0f5ce01f87257297bf4f345f9 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -3497,6 +3497,8 @@ intel_dp_handle_hdmi_link_status_change(struct intel_dp *intel_dp)
 
                drm_dp_pcon_hdmi_frl_link_error_count(&intel_dp->aux, &intel_dp->attached_connector->base);
 
+               intel_dp->frl.is_trained = false;
+
                /* Restart FRL training or fall back to TMDS mode */
                intel_dp_check_frl_training(intel_dp);
        }