[PATCH v5 04/11] USB: Pass PMSG_POWEROFF event to suspend_common() for poweroff with S4 flow

[Mario Limonciello (AMD)]

If powering off the system with the S4 flow USB wakeup sources should
be ignored. Add a new callback hcd_pci_poweroff() which will differentiate
whether target state is S5 and pass PMSG_POWEROFF as the message so that
suspend_common() will avoid doing wakeups.

Signed-off-by: Mario Limonciello (AMD) <superm1 at kernel.org>
---
v5:
 * New patch
v4:
 * https://lore.kernel.org/linux-pci/20250616175019.3471583-1-superm1@kernel.org/
---
 drivers/usb/core/hcd-pci.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index cd223475917ef..bfbd715c8cae9 100644
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -6,6 +6,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
+#include <linux/pm.h>
 #include <linux/usb.h>
 #include <linux/usb/hcd.h>
 
@@ -531,6 +532,13 @@ static int hcd_pci_freeze(struct device *dev)
 	return suspend_common(dev, PMSG_FREEZE);
 }
 
+static int hcd_pci_poweroff(struct device *dev)
+{
+	if (system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF)
+		return suspend_common(dev, PMSG_POWEROFF);
+	return suspend_common(dev, PMSG_SUSPEND);
+}
+
 static int hcd_pci_suspend_noirq(struct device *dev)
 {
 	struct pci_dev		*pci_dev = to_pci_dev(dev);
@@ -639,7 +647,7 @@ const struct dev_pm_ops usb_hcd_pci_pm_ops = {
 	.freeze_noirq	= check_root_hub_suspended,
 	.thaw_noirq	= NULL,
 	.thaw		= hcd_pci_resume,
-	.poweroff	= hcd_pci_suspend,
+	.poweroff	= hcd_pci_poweroff,
 	.poweroff_late	= hcd_pci_poweroff_late,
 	.poweroff_noirq	= hcd_pci_suspend_noirq,
 	.restore_noirq	= hcd_pci_resume_noirq,
-- 
2.43.0