[Intel-gfx] [PATCH v3 07/13] drm/i915/dp: use 128b/132b TPS2 for UHBR+ link rates

Jani Nikula
2021-09-09T12:53:00Z

128b/132b channel encoding has separate TPS1 and TPS2, although the DPCD
register values coincide with 8b/10b TPS1 and TPS2 values. Use 128b/132b
TPS2 for channel equalization.

v2: Use intel_dp_is_uhbr

Reviewed-by: Manasi Navare <manasi.d.navare@intel.com> # v1
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
drivers/gpu/drm/i915/display/intel_dp_link_training.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

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 508a514c5e37..36b35239da83 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
@@ -602,9 +602,9 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp,
}

/*
- * Pick training pattern for channel equalization. Training pattern 4 for HBR3
- * or for 1.4 devices that support it, training Pattern 3 for HBR2
- * or 1.2 devices that support it, Training Pattern 2 otherwise.
+ * Pick Training Pattern Sequence (TPS) for channel equalization. 128b/132b TPS2
+ * for UHBR+, TPS4 for HBR3 or for 1.4 devices that support it, TPS3 for HBR2 or
+ * 1.2 devices that support it, TPS2 otherwise.
*/
static u32 intel_dp_training_pattern(struct intel_dp *intel_dp,
const struct intel_crtc_state *crtc_state,
@@ -612,6 +612,10 @@ static u32 intel_dp_training_pattern(struct intel_dp *intel_dp,
{
bool source_tps3, sink_tps3, source_tps4, sink_tps4;

+ /* UHBR+ use separate 128b/132b TPS2 */
+ if (intel_dp_is_uhbr(crtc_state))
+ return DP_TRAINING_PATTERN_2;
+
/*
* Intel platforms that support HBR3 also support TPS4. It is mandatory
* for all downstream devices that support HBR3. There are no known eDP
--
2.30.2