From: Longfang Liu liulongfang@huawei.com
stable inclusion from stable-5.10.59 commit cc1a4dff23a48a3759b2b024ec62b0f34f200b4d bugzilla: 176988 https://gitee.com/openeuler/kernel/issues/I4EAR4
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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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@huaw... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@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 71ec3025686f..e87cf3a00fa4 100644 --- a/drivers/usb/host/ehci-pci.c +++ b/drivers/usb/host/ehci-pci.c @@ -297,6 +297,9 @@ 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);