linux-kernel - [PATCH 07/12] drm/dp: fix drm_dp_link_train_clock_recovery

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Date:   Tue, 3 Jul 2018 11:02:18 +0100
From:   Damian Kos <dkos@...ence.com>
To:     David Airlie <airlied@...ux.ie>, Rob Herring <robh+dt@...nel.org>,
        "Mark Rutland" <mark.rutland@....com>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        Sandy Huang <hjc@...k-chips.com>,
        Heiko Stübner <heiko@...ech.de>,
        Damian Kos <dkos@...ence.com>,
        <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-rockchip@...ts.infradead.org>
CC:     <ltyrala@...ence.com>, <pgaj@...ence.com>, <stelford@...ence.com>,
        "Quentin Schulz" <quentin.schulz@...e-electrons.com>
Subject: [PATCH 07/12] drm/dp: fix drm_dp_link_train_clock_recovery_delay for DP 1.4

From: Quentin Schulz <quentin.schulz@...e-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@...e-electrons.com>
Signed-off-by: Damian Kos <dkos@...ence.com>
---
 drivers/gpu/drm/drm_dp_helper.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

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
-- 
1.7.1