This is a note to let you know that I've just added the patch titled
drm/i915/dp: return proper DPRX link training result
to the 5.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-i915-dp-return-proper-dprx-link-training-result.patch
and it can be found in the queue-5.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9af4bf2171c1a9e3f2ebb21140c0e34e60b2a22a Mon Sep 17 00:00:00 2001
From: Lee Shawn C <shawn.c.lee@xxxxxxxxx>
Date: Tue, 6 Jul 2021 23:25:41 +0800
Subject: drm/i915/dp: return proper DPRX link training result
From: Lee Shawn C <shawn.c.lee@xxxxxxxxx>
commit 9af4bf2171c1a9e3f2ebb21140c0e34e60b2a22a upstream.
After DPRX link training, intel_dp_link_train_phy() did not
return the training result properly. If link training failed,
i915 driver would not run into link train fallback function.
And no hotplug uevent would be received by user space application.
Fixes: b30edfd8d0b4 ("drm/i915: Switch to LTTPR non-transparent mode link training")
Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Imre Deak <imre.deak@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Cooper Chiou <cooper.chiou@xxxxxxxxx>
Cc: William Tseng <william.tseng@xxxxxxxxx>
Signed-off-by: Lee Shawn C <shawn.c.lee@xxxxxxxxx>
Reviewed-by: Imre Deak <imre.deak@xxxxxxxxx>
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20210706152541.25021-1-shawn.c.lee@xxxxxxxxx
(cherry picked from commit dab1b47e57e053b2a02c22ead8e7449f79961335)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp_link_training.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
@@ -848,7 +848,7 @@ intel_dp_link_train_all_phys(struct inte
}
if (ret)
- intel_dp_link_train_phy(intel_dp, crtc_state, DP_PHY_DPRX);
+ ret = intel_dp_link_train_phy(intel_dp, crtc_state, DP_PHY_DPRX);
if (intel_dp->set_idle_link_train)
intel_dp->set_idle_link_train(intel_dp, crtc_state);
Patches currently in stable-queue which might be from shawn.c.lee@xxxxxxxxx are
queue-5.14/drm-i915-dp-return-proper-dprx-link-training-result.patch
