From: Mario Limonciello Date: Tue, 14 Sep 2021 02:01:14 +0000 (-0500) Subject: platform/x86: amd-pmc: Increase the response register timeout X-Git-Tag: v5.15-rc3~38^2~3 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=3c3c8e88c8712bfe06cd10d7ca77a94a33610cd6;p=linux-platform-drivers-x86.git platform/x86: amd-pmc: Increase the response register timeout 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@kernel.org Reported-by: Julian Sikorski BugLink: https://gitlab.freedesktop.org/drm/amd/-/issues/1629 Signed-off-by: Mario Limonciello Acked-by: Shyam Sundar S K Link: https://lore.kernel.org/r/20210914020115.655-1-mario.limonciello@amd.com Signed-off-by: Hans de Goede --- diff --git a/drivers/platform/x86/amd-pmc.c b/drivers/platform/x86/amd-pmc.c index 3481479a2942..d6a7c896ac86 100644 --- 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