This is a note to let you know that I've just added the patch titled
drm/amd/display: limit DPIA link rate to HBR3
to the 6.1-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-amd-display-limit-dpia-link-rate-to-hbr3.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0e69ef6ea82e8eece7d2b2b45a0da9670eaaefff Mon Sep 17 00:00:00 2001
From: Peichen Huang <peichen.huang@xxxxxxx>
Date: Wed, 31 May 2023 13:36:14 +0800
Subject: drm/amd/display: limit DPIA link rate to HBR3
From: Peichen Huang <peichen.huang@xxxxxxx>
commit 0e69ef6ea82e8eece7d2b2b45a0da9670eaaefff upstream.
[Why]
DPIA doesn't support UHBR, driver should not enable UHBR
for dp tunneling
[How]
limit DPIA link rate to HBR3
Cc: Mario Limonciello <mario.limonciello@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Acked-by: Stylon Wang <stylon.wang@xxxxxxx>
Signed-off-by: Peichen Huang <peichen.huang@xxxxxxx>
Reviewed-by: Mustapha Ghaddar <Mustapha.Ghaddar@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/display/dc/core/dc_link.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -1141,6 +1141,11 @@ static bool detect_link_and_local_sink(s
(link->dpcd_caps.dongle_type !=
DISPLAY_DONGLE_DP_HDMI_CONVERTER))
converter_disable_audio = true;
+
+ /* limited link rate to HBR3 for DPIA until we implement USB4 V2 */
+ if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA &&
+ link->reported_link_cap.link_rate > LINK_RATE_HIGH3)
+ link->reported_link_cap.link_rate = LINK_RATE_HIGH3;
break;
}
Patches currently in stable-queue which might be from peichen.huang@xxxxxxx are
queue-6.1/drm-amd-display-limit-dpia-link-rate-to-hbr3.patch
