[PATCH v5 7/9] usb: host: pci-quirks: Bypass xHCI quirks for Raspberry Pi 4

[Nicolas Saenz Julienne]

The board doesn't need the quirks to be run, and takes care of its own
initialization through a reset controller device. So let's bypass them.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne at suse.de>
Reviewed-by: Florian Fainelli <f.fainelli at gmail.com>

---

Changes since v2:
 - Correct reference counting on parent device node

Changes since v1:
 - Correct typos

 drivers/usb/host/pci-quirks.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index 358015328391..977d0b6d7577 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -16,6 +16,7 @@
 #include <linux/export.h>
 #include <linux/acpi.h>
 #include <linux/dmi.h>
+#include <linux/of.h>
 
 #include "pci-quirks.h"
 #include "xhci-ext-caps.h"
@@ -1244,11 +1245,27 @@ static void quirk_usb_handoff_xhci(struct pci_dev *pdev)
 
 static void quirk_usb_early_handoff(struct pci_dev *pdev)
 {
+	struct device_node *parent;
+	bool is_rpi;
+
 	/* Skip Netlogic mips SoC's internal PCI USB controller.
 	 * This device does not need/support EHCI/OHCI handoff
 	 */
 	if (pdev->vendor == 0x184e)	/* vendor Netlogic */
 		return;
+
+	/*
+	 * Bypass the Raspberry Pi 4 controller xHCI controller, things are
+	 * taken care of by the board's co-processor.
+	 */
+	if (pdev->vendor == PCI_VENDOR_ID_VIA && pdev->device == 0x3483) {
+		parent = of_get_parent(pdev->bus->dev.of_node);
+		is_rpi = of_device_is_compatible(parent, "brcm,bcm2711-pcie");
+		of_node_put(parent);
+		if (is_rpi)
+			return;
+	}
+
 	if (pdev->class != PCI_CLASS_SERIAL_USB_UHCI &&
 			pdev->class != PCI_CLASS_SERIAL_USB_OHCI &&
 			pdev->class != PCI_CLASS_SERIAL_USB_EHCI &&
-- 
2.27.0