On 2021/4/8 15:03, Longfang Liu wrote:
> When rebooting the EHCI driver, ehci_shutdown() will be called.
> if the sbrn flag is 0, ehci_shutdown() will return directly.
>
> Our EHCI hardware does not define the SBRN register, which cause
> its value to default to 0. The sbrn flag being 0 will cause the
> EHCI interrupt signal to not be turned off after reboot. An interrupt
> that is not closed will cause an exception to the device sharing
> the interrupt.
>
> Currently, our hardware has this problem. We hope to solve this
> problem by skipping reading the sbrn register value. On the next
> generation of hardware, we will define this SBRN register in accordance
> with the controller standard.
>
> Signed-off-by: Longfang Liu <[email protected]>
> ---
> drivers/usb/host/ehci-pci.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
> index 3c3820a..5dc6821 100644
> --- a/drivers/usb/host/ehci-pci.c
> +++ b/drivers/usb/host/ehci-pci.c
> @@ -291,6 +291,8 @@ 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)
> + ; /* sbrn register is undefined */
> else
> pci_read_config_byte(pdev, 0x60, &ehci->sbrn);
>
>
Sorry, please ignore this patch, I will resend it.
Thanks.
Longfang.
