USB:ehci:fix Kunpeng920 ehci hardware problem

commit 26b75952ca0b8b4b3050adb9582c8e2f44d49687 upstream.

Kunpeng920's EHCI controller does not have SBRN register.
Reading the SBRN register when the controller driver is
initialized will get 0.

When rebooting the EHCI driver, ehci_shutdown() will be called.
if the sbrn flag is 0, ehci_shutdown() will return directly.
The sbrn flag being 0 will cause the EHCI interrupt signal to
not be turned off after reboot. this interrupt that is not closed
will cause an exception to the device sharing the interrupt.

Therefore, the EHCI controller of Kunpeng920 needs to skip
the read operation of the SBRN register.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Longfang Liu <liulongfang@huawei.com>
Link: https://lore.kernel.org/r/1617958081-17999-1-git-send-email-liulongfang@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 66713c25376539a8f27ac91d613d424757467380..774ccaa5aceeaff13bc8b05768e5acfc87702a8f 100644 (file)
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -298,6 +298,9 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
        if (pdev->vendor == PCI_VENDOR_ID_STMICRO
            && pdev->device == PCI_DEVICE_ID_STMICRO_USB_HOST)
                ;       /* ConneXT has no sbrn register */
+       else if (pdev->vendor == PCI_VENDOR_ID_HUAWEI
+                        && pdev->device == 0xa239)
+               ;       /* HUAWEI Kunpeng920 USB EHCI has no sbrn register */
        else
                pci_read_config_byte(pdev, 0x60, &ehci->sbrn);