This patch was already backported to: 5.15.y (commit 0159c7b266830a082f73f0a48da3d21b5936bbec) and 5.16.y (commit 49201b90af818654c5506a0decc18e111eadcb66) Regards, Fabrizio ---------- Forwarded message --------- From: <gregkh@xxxxxxxxxxxxxxxxxxx> Date: Sun, Jan 23, 2022 at 9:14 AM Subject: FAILED: patch "[PATCH] platform/x86: amd-pmc: Fix s2idle failures on certain AMD" failed to apply to 5.16-stable tree To: <fabriziobertocci@xxxxxxxxx>, <Shyam-sundar.S-k@xxxxxxx>, <hdegoede@xxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> The patch below does not apply to the 5.16-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From a602f5111fdd3d8a8ea2ac9e61f1c047d9794062 Mon Sep 17 00:00:00 2001 From: Fabrizio Bertocci <fabriziobertocci@xxxxxxxxx> Date: Mon, 29 Nov 2021 23:15:40 -0500 Subject: [PATCH] platform/x86: amd-pmc: Fix s2idle failures on certain AMD laptops On some AMD hardware laptops, the system fails communicating with the PMC when entering s2idle and the machine is battery powered. Hardware description: HP Pavilion Aero Laptop 13-be0097nr CPU: AMD Ryzen 7 5800U with Radeon Graphics GPU: 03:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Device [1002:1638] (rev c1) Detailed description of the problem (and investigation) here: https://gitlab.freedesktop.org/drm/amd/-/issues/1799 Patch is a single line: reduce the polling delay in half, from 100uSec to 50uSec when waiting for a change in state from the PMC after a write command operation. After changing the delay, I did not see a single failure on this machine (I have this fix for now more than one week and s2idle worked every single time on battery power). Cc: stable@xxxxxxxxxxxxxxx Acked-by: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx> Signed-off-by: Fabrizio Bertocci <fabriziobertocci@xxxxxxxxx> Link: https://lore.kernel.org/r/CADtzkx7TdfbwtaVEXUdD6YXPey52E-nZVQNs+Z41DTx7gqMqtw@xxxxxxxxxxxxxx Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> diff --git a/drivers/platform/x86/amd-pmc.c b/drivers/platform/x86/amd-pmc.c index b7e50ed050a8..841c44cd64c2 100644 --- a/drivers/platform/x86/amd-pmc.c +++ b/drivers/platform/x86/amd-pmc.c @@ -76,7 +76,7 @@ #define AMD_CPU_ID_CZN AMD_CPU_ID_RN #define AMD_CPU_ID_YC 0x14B5 -#define PMC_MSG_DELAY_MIN_US 100 +#define PMC_MSG_DELAY_MIN_US 50 #define RESPONSE_REGISTER_LOOP_MAX 20000 #define SOC_SUBSYSTEM_IP_MAX 12
