drm/i915/dp: Include the time taken by AUX Tx for timeout

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@intel.com>
Signed-off-by: Arun R Murthy <arun.r.murthy@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240925034432.1777029-4-arun.r.murthy@intel.com

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 a48a70ca4fb3f038f359dba6001333643fb6d74f..ea9b4730a176f16af56810248d1b66b9d97c5fd0 100644 (file)
--- 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);