[PATCH] drm/xe/display: read PCON capability only when present

[Chaitanya Kumar Borah]

Read PCON capabilities only when it is present. This will prevent
spurious DCPD read failures.

[drm] *ERROR* Failed to read DPCD register 0x92

Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 277b40b13948..8a1c2a37a56b 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -5681,7 +5681,8 @@ intel_dp_update_dfp(struct intel_dp *intel_dp,
 		    intel_dp->dfp.max_tmds_clock,
 		    intel_dp->dfp.pcon_max_frl_bw);
 
-	intel_dp_get_pcon_dsc_cap(intel_dp);
+	if (drm_dp_is_branch(intel_dp->dpcd))
+		intel_dp_get_pcon_dsc_cap(intel_dp);
 }
 
 static bool
-- 
2.25.1