[Intel-gfx] [PATCH 1/3] drm/i915: ignore link rate in TPS3 selection

[Jani Nikula]

TPS3 is mandatory for downstream devices that support HBR2, and Intel
platforms that support HBR2 also support TPS3. Whenever TPS3 is
supported by both the source and sink, it should be used. In other
words, whenever the source and sink are capable of 5.4 Gbps link, we
should anyway go for TPS3, regardless of the link rate being selected.

Log an error if the sink has advertized HBR2 capability without TPS3
capability.

Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 12bce36065a1..4e68681465d2 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3864,10 +3864,11 @@ intel_dp_complete_link_train(struct intel_dp *intel_dp)
 	 * Due to WaDisableHBR2 SKL < B0 is the only exception where TPS3 is
 	 * supported but still not enabled.
 	 */
-	if (intel_dp->link_rate == 540000 ||
-	    (intel_dp_source_supports_hbr2(dev) &&
-	     intel_dp_tps3_supported(intel_dp->dpcd)))
+	if (intel_dp_source_supports_hbr2(dev) &&
+	    intel_dp_tps3_supported(intel_dp->dpcd))
 		training_pattern = DP_TRAINING_PATTERN_3;
+	else if (intel_dp->link_rate == 540000)
+		DRM_ERROR("5.4 Gbps link rate without HBR2/TPS3 support\n");
 
 	/* channel equalization */
 	if (!intel_dp_set_link_train(intel_dp, &DP,
-- 
2.1.4