0158-clocksource-only-perform-extended-clocksource-checks.patch

From a9b2afb45dbf18398c22d9504402dc1258859bec Mon Sep 17 00:00:00 2001
From: Colin Ian King <colin.king@intel.com>
Date: Wed, 3 May 2023 17:31:05 +0100
Subject: [PATCH] clocksource: only perform extended clocksource checks for AMD
 systems

Signed-off-by: Colin Ian King <colin.king@intel.com>
---
 drivers/clocksource/acpi_pm.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/acpi_pm.c b/drivers/clocksource/acpi_pm.c
index 82338773602c..d84f0e29452e 100644
--- a/drivers/clocksource/acpi_pm.c
+++ b/drivers/clocksource/acpi_pm.c
@@ -176,13 +176,16 @@ static int verify_pmtmr_rate(void)
 static int __init init_acpi_pm_clocksource(void)
 {
 	u64 value1, value2;
-	unsigned int i, j = 0;
+	unsigned int i, j = 0, checks = 1;
 
 	if (!pmtmr_ioport)
 		return -ENODEV;
 
+	if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+		checks = ACPI_PM_MONOTONICITY_CHECKS;
+
 	/* "verify" this timing source: */
-	for (j = 0; j < ACPI_PM_MONOTONICITY_CHECKS; j++) {
+	for (j = 0; j < checks; j++) {
 		udelay(100 * j);
 		value1 = clocksource_acpi_pm.read(&clocksource_acpi_pm);
 		for (i = 0; i < ACPI_PM_READ_CHECKS; i++) {
-- 
2.40.1