[PATCH v2 1/5] platform/x86/amd/pmc: Check for intermediate wakeup in function

[Daniel Gibson <daniel@gibson.sh>]

This slightly refactors code introduced by the
"pmc: Require at least 2.5 seconds between HW sleep cycles" commit
to allow adding different conditions for that delay later.

References: 9f5595d5f03f ("platform/x86/amd: pmc: Require at least 2.5 seconds between HW sleep cycles")
Signed-off-by: Daniel Gibson <daniel@gibson.sh>
---
 drivers/platform/x86/amd/pmc/pmc.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/amd/pmc/pmc.c b/drivers/platform/x86/amd/pmc/pmc.c
index cae3fcafd4d7..2b9e5730170a 100644
--- a/drivers/platform/x86/amd/pmc/pmc.c
+++ b/drivers/platform/x86/amd/pmc/pmc.c
@@ -598,6 +598,19 @@ static int amd_pmc_verify_czn_rtc(struct amd_pmc_dev *pdev, u32 *arg)
 	return rc;
 }
 
+static bool amd_pmc_intermediate_wakeup_need_delay(struct amd_pmc_dev *pdev)
+{
+	/*
+	 * Starting a new HW sleep cycle right after waking from one
+	 * can cause electrical problems triggering the over voltage protection.
+	 * That is avoided by delaying the next suspend a bit, see also
+	 * https://lore.kernel.org/all/20250414162446.3853194-1-superm1@kernel.org/
+	 */
+	struct smu_metrics table;
+
+	return get_metrics_table(pdev, &table) == 0 && table.s0i3_last_entry_status;
+}
+
 static void amd_pmc_s2idle_prepare(void)
 {
 	struct amd_pmc_dev *pdev = &pmc;
@@ -632,11 +645,9 @@ static void amd_pmc_s2idle_prepare(void)
 static void amd_pmc_s2idle_check(void)
 {
 	struct amd_pmc_dev *pdev = &pmc;
-	struct smu_metrics table;
 	int rc;
 
-	/* Avoid triggering OVP */
-	if (!get_metrics_table(pdev, &table) && table.s0i3_last_entry_status)
+	if (amd_pmc_intermediate_wakeup_need_delay(pdev))
 		msleep(2500);
 
 	/* Dump the IdleMask before we add to the STB */
-- 
2.48.1