linux-kernel - [PATCH] xhci-pci: Allow host runtime PM as default for Intel Alder Lake xHCI

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Message-Id: <20210406233529.19543-1-azhar.shaikh@intel.com>
Date:   Tue,  6 Apr 2021 16:35:29 -0700
From:   Azhar Shaikh <azhar.shaikh@...el.com>
To:     mathias.nyman@...ux.intel.com, gregkh@...uxfoundation.org,
        p.zabel@...gutronix.de, linux-usb@...r.kernel.org
Cc:     mika.westerberg@...ux.intel.com, abhijeet.rao@...el.com,
        nikunj.dadhania@...el.com, linux-kernel@...r.kernel.org,
        azhar.shaikh@...el.com
Subject: [PATCH] xhci-pci: Allow host runtime PM as default for Intel Alder Lake xHCI

From: Abhijeet Rao <abhijeet.rao@...el.com>

In the same way as Intel Tiger Lake TCSS (Type-C Subsystem) the Alder Lake
TCSS xHCI needs to be runtime suspended whenever possible to allow the
TCSS hardware block to enter D3cold and thus save energy.

Signed-off-by: Abhijeet Rao <abhijeet.rao@...el.com>
Signed-off-by: Nikunj A. Dadhania <nikunj.dadhania@...el.com>
Signed-off-by: Azhar Shaikh <azhar.shaikh@...el.com>
---
 drivers/usb/host/xhci-pci.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 5bbccc9a0179..a858add8436c 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -57,6 +57,7 @@
 #define PCI_DEVICE_ID_INTEL_CML_XHCI			0xa3af
 #define PCI_DEVICE_ID_INTEL_TIGER_LAKE_XHCI		0x9a13
 #define PCI_DEVICE_ID_INTEL_MAPLE_RIDGE_XHCI		0x1138
+#define PCI_DEVICE_ID_INTEL_ALDER_LAKE_XHCI		0x461e
 
 #define PCI_DEVICE_ID_AMD_PROMONTORYA_4			0x43b9
 #define PCI_DEVICE_ID_AMD_PROMONTORYA_3			0x43ba
@@ -243,7 +244,8 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 	     pdev->device == PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_XHCI ||
 	     pdev->device == PCI_DEVICE_ID_INTEL_ICE_LAKE_XHCI ||
 	     pdev->device == PCI_DEVICE_ID_INTEL_TIGER_LAKE_XHCI ||
-	     pdev->device == PCI_DEVICE_ID_INTEL_MAPLE_RIDGE_XHCI))
+	     pdev->device == PCI_DEVICE_ID_INTEL_MAPLE_RIDGE_XHCI ||
+	     pdev->device == PCI_DEVICE_ID_INTEL_ALDER_LAKE_XHCI))
 		xhci->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
 
 	if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
-- 
2.17.1