linux-kernel - [PATCH] usb: xhci: Enable LPM for VIA LABS VL805

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Message-Id: <20200120142422.3907-1-nsaenzjulienne@suse.de>
Date:   Mon, 20 Jan 2020 15:24:22 +0100
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Mathias Nyman <mathias.nyman@...el.com>
Cc:     linux-rpi-kernel@...ts.infradead.org,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] usb: xhci: Enable LPM for VIA LABS VL805

This PCIe controller chip is used on the Raspberry Pi 4 and multiple
adapter cards. There is no publicly available documentation for the
chip, yet both the downstream RPi4 kernel and the controller cards
support/advertise LPM support.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
---
 drivers/usb/host/xhci-pci.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 4917c5b033fa..c1976e98992b 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -241,6 +241,9 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 			pdev->device == 0x3432)
 		xhci->quirks |= XHCI_BROKEN_STREAMS;
 
+	if (pdev->vendor == PCI_VENDOR_ID_VIA && pdev->device == 0x3483)
+		xhci->quirks |= XHCI_LPM_SUPPORT;
+
 	if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA &&
 			pdev->device == 0x1042)
 		xhci->quirks |= XHCI_BROKEN_STREAMS;
-- 
2.24.1