From: Longfang Liu liulongfang@huawei.com
mainline inclusion from mainline-5.13 commit 26b75952ca0b category: bugfix bugzilla: NA CVE: NA
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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@huaw... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Wenchao Hao haowenchao@huawei.com Reviewed-by: Weifeng Su suweifeng1@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/usb/host/ehci-pci.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c index fcfad5c298a9f..56e6fd0f04829 100644 --- 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);