[Intel-gfx] [PATCH v3 08/13] drm/i915/dp: select 128b/132b channel encoding for UHBR rates

Jani Nikula
2021-09-09T12:53:24Z

UHBR rates and 128b/132b channel encoding go hand in hand.

v2: Fix check for >= UHBR rates using intel_dp_is_uhbr() (Ville)

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 | 3 ++-
1 file changed, 2 insertions(+), 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 36b35239da83..4f116cd32846 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
@@ -495,7 +495,8 @@ intel_dp_prepare_link_train(struct intel_dp *intel_dp,
&rate_select, 1);

link_config[0] = crtc_state->vrr.enable ? DP_MSA_TIMING_PAR_IGNORE_EN : 0;
- link_config[1] = DP_SET_ANSI_8B10B;
+ link_config[1] = intel_dp_is_uhbr(crtc_state) ?
+ DP_SET_ANSI_128B132B : DP_SET_ANSI_8B10B;
drm_dp_dpcd_write(&intel_dp->aux, DP_DOWNSPREAD_CTRL, link_config, 2);

intel_dp->DP |= DP_PORT_EN;
--
2.30.2