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platform/x86: amd-pmc: Increase the response register timeout

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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 055162645a ("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@kernel.org
Reported-by: Julian Sikorski <belegdol@gmail.com>
BugLink: https://gitlab.freedesktop.org/drm/amd/-/issues/1629
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Acked-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20210914020115.655-1-mario.limonciello@amd.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Mario Limonciello 2021-09-13 21:01:14 -05:00 committed by Hans de Goede
parent 196159d278
commit 3c3c8e88c8
1 changed files with 1 additions and 1 deletions
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2
drivers/platform/x86/amd-pmc.c
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@ -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