drm/amd/display: Add a Precise Delay Routine

Fix DP compliance failures 4.2.2.12, 4.3.1.21, 4.9.1.19
caused by imprecise delay on fsleep().

Reviewed-by: Aric Cyr <[email protected]>
Signed-off-by: Fangzhi Zuo <[email protected]>
Signed-off-by: Wayne Lin <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c
index a42c56a5725306cab8052fc4bdd666074401ce9b..754c895e1bfbde5b144ef1ed5cdcbd1e129c46d9 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c
@@ -272,7 +272,7 @@ void dp_wait_for_training_aux_rd_interval(
        struct dc_link *link,
        uint32_t wait_in_micro_secs)
 {
-       fsleep(wait_in_micro_secs);
+       usleep_range_state(wait_in_micro_secs, wait_in_micro_secs, TASK_UNINTERRUPTIBLE);
 
        DC_LOG_HW_LINK_TRAINING("%s:\n wait = %d\n",
                __func__,