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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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