[Intel-gfx] [PATCH] drm/i915/dp: take LTTPR into account in 128b/132b rates

[Jani Nikula]

Limit the supported UHBR rates based on the repeater support, if there
are repeaters.

This should be done in DP helper level, but that requires an overhaul of
the LTTPR handling, as the max rate is not enough to represent how
128b/132b rates may be masked along the way.

Curiously, the spec says:

* Shall be cleared to 00h when operating in 8b/10b Link Layer.

* Each LTTPR on the way back to the DPTX shall clear the bits that do
  not correspond to the LTTPR's current bit rate.

It's rather vague if we can reliably use the field at this time due to
the wording "operating" and "current". But it would seem bizarre to have
to wait until trying to operate a 128b/132b link layer at a certain bit
rate to figure this out.

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 74a657ae131a..5824b7d9f4a8 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -140,6 +140,9 @@ static void intel_dp_set_sink_rates(struct intel_dp *intel_dp)
 		return;
 	}
 
+	/*
+	 * Sink rates for 8b/10b.
+	 */
 	max_rate = drm_dp_bw_code_to_link_rate(intel_dp->dpcd[DP_MAX_LINK_RATE]);
 	max_lttpr_rate = drm_dp_lttpr_max_link_rate(intel_dp->lttpr_common_caps);
 	if (max_lttpr_rate)
@@ -163,6 +166,20 @@ static void intel_dp_set_sink_rates(struct intel_dp *intel_dp)
 		drm_dp_dpcd_readb(&intel_dp->aux,
 				  DP_128B132B_SUPPORTED_LINK_RATES, &uhbr_rates);
 
+		if (drm_dp_lttpr_count(intel_dp->lttpr_common_caps)) {
+			/* We have a repeater */
+			if (intel_dp->lttpr_common_caps[0] >= 0x20 &&
+			    intel_dp->lttpr_common_caps[DP_MAIN_LINK_CHANNEL_CODING_PHY_REPEATER -
+							DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV] &
+			    DP_PHY_REPEATER_128B132B_SUPPORTED) {
+				/* Repeater supports 128b/132b, valid UHBR rates */
+				uhbr_rates &= intel_dp->lttpr_common_caps[DP_PHY_REPEATER_128B132B_RATES - DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV];
+			} else {
+				/* Does not support 128b/132b */
+				uhbr_rates = 0;
+			}
+		}
+
 		if (uhbr_rates & DP_UHBR10)
 			intel_dp->sink_rates[i++] = 1000000;
 		if (uhbr_rates & DP_UHBR13_5)
-- 
2.30.2