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37 lines
1.3 KiB
Diff
37 lines
1.3 KiB
Diff
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From 06b758a32bb5ca164cff60f20173ecd71508c5ae Mon Sep 17 00:00:00 2001
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From: Sandor Yu <Sandor.yu@nxp.com>
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Date: Mon, 9 Dec 2019 17:58:29 +0800
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Subject: [PATCH] LF-323-2: drm/bridge/cdns: enhance link training stability
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Remove drm_dp_link_power_down from bridge_disable function,
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in case some DP sinks aren't follow DP 1.1 specification
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and can not exit the power saving state within 1 ms.
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Add drm_dp_link_power_up to bridge_enable function,
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make sure DP sinks are power up before link training.
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Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
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Reviewed-by: Robby Cai <robby.cai@nxp.com>
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---
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drivers/gpu/drm/bridge/cadence/cdns-dp-core.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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--- a/drivers/gpu/drm/bridge/cadence/cdns-dp-core.c
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+++ b/drivers/gpu/drm/bridge/cadence/cdns-dp-core.c
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@@ -329,6 +329,8 @@ static void cdn_hdp_bridge_enable(struct
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struct cdns_mhdp_device *mhdp = bridge->driver_private;
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int ret;
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+ drm_dp_link_power_up(&mhdp->dp.aux, &mhdp->dp.link);
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+
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/* Link trainning */
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ret = cdns_mhdp_train_link(mhdp);
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if (ret) {
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@@ -348,7 +350,6 @@ static void cdn_hdp_bridge_disable(struc
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struct cdns_mhdp_device *mhdp = bridge->driver_private;
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cdns_mhdp_set_video_status(mhdp, CONTROL_VIDEO_IDLE);
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- drm_dp_link_power_down(&mhdp->dp.aux, &mhdp->dp.link);
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}
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static const struct drm_bridge_funcs cdns_dp_bridge_funcs = {
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