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Subject[PATCH v5 7/9] usb: host: pci-quirks: Bypass xHCI quirks for Raspberry Pi 4
Date
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@suse.de>
Reviewed-by: Florian Fainelli <f.fainelli@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
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