This is a note to let you know that I've just added the patch titled
platform/x86: amd-pmc: Increase the response register timeout
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:
platform-x86-amd-pmc-increase-the-response-register-timeout.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 3c3c8e88c8712bfe06cd10d7ca77a94a33610cd6 Mon Sep 17 00:00:00 2001
From: Mario Limonciello <mario.limonciello@xxxxxxx>
Date: Mon, 13 Sep 2021 21:01:14 -0500
Subject: platform/x86: amd-pmc: Increase the response register timeout
From: Mario Limonciello <mario.limonciello@xxxxxxx>
commit 3c3c8e88c8712bfe06cd10d7ca77a94a33610cd6 upstream.
There have been reports of approximately a 0.9%-1.7% failure rate in SMU
communication timeouts with s0i3 entry on some OEM designs. Currently
the design in amd-pmc is to try every 100us for up to 20ms.
However the GPU driver which also communicates with the SMU using a
mailbox register which the driver polls every 1us for up to 2000ms.
In the GPU driver this was increased by commit 055162645a40 ("drm/amd/pm:
increase time out value when sending msg to SMU")
Increase the maximum timeout used by amd-pmc to 2000ms to match this
behavior. This has been shown to improve the stability for machines
that randomly have failures.
Cc: stable@xxxxxxxxxx
Reported-by: Julian Sikorski <belegdol@xxxxxxxxx>
BugLink: https://gitlab.freedesktop.org/drm/amd/-/issues/1629
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Acked-by: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx>
Link: https://lore.kernel.org/r/20210914020115.655-1-mario.limonciello@xxxxxxx
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/platform/x86/amd-pmc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/platform/x86/amd-pmc.c
+++ b/drivers/platform/x86/amd-pmc.c
@@ -71,7 +71,7 @@
#define AMD_CPU_ID_YC 0x14B5
#define PMC_MSG_DELAY_MIN_US 100
-#define RESPONSE_REGISTER_LOOP_MAX 200
+#define RESPONSE_REGISTER_LOOP_MAX 20000
#define SOC_SUBSYSTEM_IP_MAX 12
#define DELAY_MIN_US 2000
Patches currently in stable-queue which might be from mario.limonciello@xxxxxxx are
queue-5.14/platform-x86-amd-pmc-increase-the-response-register-timeout.patch
