[PATCH v2 3/6] drm/i915/dp: Reset cached LTTPR count if number of LTTPRs is unsupported

[Imre Deak]

After detection the cached LTTPR count can be checked to determine if
LTTPRs in non-transparent mode were detected. Reset the cached LTTPR
count if the reported number of LTTPRs is invalid to ensure the above
checks work as expected.

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp_link_training.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
index d044c8e36bb3d..56b9c5cb1254d 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
@@ -174,7 +174,7 @@ static int intel_dp_init_lttpr_phys(struct intel_dp *intel_dp, const u8 dpcd[DP_
 	 * still taking into account any LTTPR common lane- rate/count limits.
 	 */
 	if (lttpr_count < 0)
-		return 0;
+		goto out_reset_lttpr_count;
 
 	if (!intel_dp_set_lttpr_transparent_mode(intel_dp, false)) {
 		lt_dbg(intel_dp, DP_PHY_DPRX,
-- 
2.43.3