diff mbox series

[07/12] drm/dp: fix drm_dp_link_train_clock_recovery_delay for DP 1.4

Message ID 1530612152-27555-8-git-send-email-dkos@cadence.com
State New
Headers show
Series [01/12] HACK: increase timeout for drm_atomic_helper_wait_for_vblanks | expand

Commit Message

Damian Kos July 3, 2018, 10:02 a.m. UTC 
From: Quentin Schulz <quentin.schulz@free-electrons.com>


In DP 1.4, interval between link status and adjust request read for the
clock recovery phase is fixed to 100us whatever the value of the
register is.

Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>

Signed-off-by: Damian Kos <dkos@cadence.com>

---
 drivers/gpu/drm/drm_dp_helper.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

-- 
1.7.1

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diff mbox series

Patch

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index b6a27ab..92f3880 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -152,6 +152,11 @@  void drm_dp_link_train_clock_recovery_delay(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
 	unsigned int training_interval = dpcd[DP_TRAINING_AUX_RD_INTERVAL] &
 		DP_TRAINING_AUX_RD_INTERVAL_MASK;
 
+	if (dpcd[DP_DPCD_REV] == 0x14) {
+		udelay(100);
+		return;
+	}
+
 	if (training_interval == 0)
 		udelay(100);
 	else