As per DP spec the timeout for LANE_CHANNEL_EQ_DONE is 400ms. But this
timeout value is exclusively for the Aux RD Interval and excludes the
time consumed for the AUX Tx (i.e reading/writing FFE presets). Add
another 50ms for these AUX Tx to the 400ms timeout.
Ref: "Figure 3-52: 128b132b DP DPTC LANEx_CHANNEL_EQ_DONE Sequence" of
DP2.1a spec.
Co-developed-by: Srikanth V NagaVenkata <nagavenkata.srikanth.v@xxxxxxxxx>
Signed-off-by: Arun R Murthy <arun.r.murthy@xxxxxxxxx>
Reviewed-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
Acked-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp_link_training.c | 2 +-
1 file changed, 1 insertion(+), 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 ec6c323a49c0..ddf91b3533a4 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
@@ -1414,7 +1414,7 @@ intel_dp_128b132b_lane_eq(struct intel_dp *intel_dp,
}
/* Time budget for the LANEx_EQ_DONE Sequence */
- deadline = jiffies + msecs_to_jiffies_timeout(400);
+ deadline = jiffies + msecs_to_jiffies_timeout(450);
for (try = 0; try < max_tries; try++) {
fsleep(delay_us);
--
2.25.1
