linux-kernel - [PATCH] rtc: cmos: Use ACPI alarm for non-Intel x86 systems too

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Message-ID: <20231106162310.85711-1-mario.limonciello@amd.com>
Date:   Mon, 6 Nov 2023 10:23:10 -0600
From:   Mario Limonciello <mario.limonciello@....com>
To:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
CC:     "open list:REAL TIME CLOCK (RTC) SUBSYSTEM" 
        <linux-rtc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        <alvin.zhuge@...il.com>, <renzhamin@...il.com>, <kelvie@...vie.ca>,
        <rrangel@...gle.com>,
        "Mario Limonciello" <mario.limonciello@....com>
Subject: [PATCH] rtc: cmos: Use ACPI alarm for non-Intel x86 systems too

Intel systems > 2015 have been configured to use ACPI alarm instead
of HPET to avoid s2idle issues.

Having HPET programmed for wakeup causes problems on AMD systems with
s2idle as well.

One particular case is that the systemd "SuspendThenHibernate" feature
doesn't work properly on the Framework 13" AMD model. Switching to
using ACPI alarm fixes the issue.

Adjust the quirk to apply to AMD/Hygon systems from 2021 onwards.
This matches what has been tested and is specifically to avoid potential
risk to older systems.

Cc: stable@...r.kernel.org # 6.1+
Reported-by: alvin.zhuge@...il.com
Reported-by: renzhamin@...il.com
Closes: https://github.com/systemd/systemd/issues/24279
Reported-by: Kelvie Wong <kelvie@...vie.ca>
Closes: https://community.frame.work/t/systemd-suspend-then-hibernate-wakes-up-after-5-minutes/39392
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/rtc/rtc-cmos.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index 228fb2d11c70..696cfa7025de 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -818,18 +818,24 @@ static void rtc_wake_off(struct device *dev)
 }
 
 #ifdef CONFIG_X86
-/* Enable use_acpi_alarm mode for Intel platforms no earlier than 2015 */
 static void use_acpi_alarm_quirks(void)
 {
-	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
+	switch (boot_cpu_data.x86_vendor) {
+	case X86_VENDOR_INTEL:
+		if (dmi_get_bios_year() < 2015)
+			return;
+		break;
+	case X86_VENDOR_AMD:
+	case X86_VENDOR_HYGON:
+		if (dmi_get_bios_year() < 2021)
+			return;
+		break;
+	default:
 		return;
-
+	}
 	if (!is_hpet_enabled())
 		return;
 
-	if (dmi_get_bios_year() < 2015)
-		return;
-
 	use_acpi_alarm = true;
 }
 #else
-- 
2.34.1