linux-kernel - [PATCH 1/2] xhci: pci: If no ports have wakeup enabled then disable PCI device at S4

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Message-ID: <20240712185418.937087-2-superm1@kernel.org>
Date: Fri, 12 Jul 2024 13:54:17 -0500
From: superm1@...nel.org
To: Mathias Nyman <mathias.nyman@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org (open list:USB XHCI DRIVER),
	linux-kernel@...r.kernel.org (open list),
	Kai-Heng Feng <kai.heng.feng@...onical.com>,
	mika.westerberg@...ux.intel.com,
	Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH 1/2] xhci: pci: If no ports have wakeup enabled then disable PCI device at S4

From: Mario Limonciello <mario.limonciello@....com>

If a port on an XHCI controller hasn't been marked for wakeup at S4, then
leaving it at D0 will needlessly consume power than necessary.

Explicitly check ports configured for wakeup and if none are found then
put the controller into D3hot before hibernate.

Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/usb/host/xhci-pci.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 05881153883ec..4408d4caf66d2 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -823,6 +823,7 @@ static int xhci_pci_poweroff_late(struct usb_hcd *hcd, bool do_wakeup)
 	struct usb_device	*udev;
 	u32			portsc;
 	int			i;
+	bool			wakeup = false;
 
 	/*
 	 * Systems with XHCI_RESET_TO_DEFAULT quirk have boot firmware that
@@ -860,6 +861,14 @@ static int xhci_pci_poweroff_late(struct usb_hcd *hcd, bool do_wakeup)
 			 port->rhub->hcd->self.busnum, port->hcd_portnum + 1);
 		portsc = xhci_port_state_to_neutral(portsc);
 		writel(portsc | PORT_PE, port->addr);
+		wakeup = true;
+	}
+
+	if (!wakeup) {
+		struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
+
+		xhci_shutdown(hcd);
+		pci_set_power_state(pdev, PCI_D3hot);
 	}
 
 	return 0;
-- 
2.43.0