linux-kernel - [PATCH] usb: xhci: Enable runtime-pm by default on AMD Yellow Carp platform

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Message-ID: <20210920154100.3195683-1-Nehal-Bakulchandra.shah@amd.com>
Date:   Mon, 20 Sep 2021 21:11:00 +0530
From:   Nehal Bakulchandra Shah <Nehal-Bakulchandra.shah@....com>
To:     <mathias.nyman@...el.com>, <gregkh@...uxfoundation.org>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Nehal Bakulchandra Shah" <Nehal-Bakulchandra.shah@....com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        Mario Limonciello <mario.limonciello@....com>,
        Basavaraj Natikar <Basavaraj.Natikar@....com>
Subject: [PATCH] usb: xhci: Enable runtime-pm by default on AMD Yellow Carp platform

AMD's Yellow Carp platform supports runtime power management for
XHCI Controllers, so enable the same by default for all XHCI Controllers.

Signed-off-by: Nehal Bakulchandra Shah <Nehal-Bakulchandra.shah@....com>
Reviewed-by: Shyam Sundar S K <Shyam-sundar.S-k@....com>
Reviewed-by: Mario Limonciello <mario.limonciello@....com>
Reviewed-by: Basavaraj Natikar <Basavaraj.Natikar@....com>
---
 drivers/usb/host/xhci-pci.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 2c9f25ca8edd..0e571d6af2ab 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -69,6 +69,12 @@
 #define PCI_DEVICE_ID_ASMEDIA_1142_XHCI			0x1242
 #define PCI_DEVICE_ID_ASMEDIA_2142_XHCI			0x2142
 #define PCI_DEVICE_ID_ASMEDIA_3242_XHCI			0x3242
+#define PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_1	0x161a
+#define PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_2	0x161b
+#define PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_3	0x161d
+#define PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_4	0x161e
+#define PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_5	0x15d6
+#define PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_6	0x15d7
 
 static const char hcd_name[] = "xhci_hcd";
 
@@ -313,6 +319,15 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 	     pdev->device == PCI_DEVICE_ID_AMD_PROMONTORYA_4))
 		xhci->quirks |= XHCI_NO_SOFT_RETRY;
 
+	if (pdev->vendor == PCI_VENDOR_ID_AMD &&
+	    (pdev->device == PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_1 ||
+	    pdev->device == PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_2 ||
+	    pdev->device == PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_3 ||
+	    pdev->device == PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_4 ||
+	    pdev->device == PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_5 ||
+	    pdev->device == PCI_DEVICE_ID_AMD_YELLOW_CARP_XHCI_6))
+		xhci->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;
+
 	if (xhci->quirks & XHCI_RESET_ON_RESUME)
 		xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
 				"QUIRK: Resetting on resume");
-- 
2.25.1