On 4/20/23 8:21 PM, Weitao Wang wrote:
> Add U1/U2 feature support of xHCI for zhaoxin.
>
> Signed-off-by: Weitao Wang <WeitaoWang-oc@xxxxxxxxxxx>
[...]
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index 6307bae9cddf..730c0f68518d 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
[...]
> @@ -4938,6 +4938,27 @@ static int xhci_update_timeout_for_interface(struct xhci_hcd *xhci,
> return 0;
> }
>
> +static int xhci_check_zhaoxin_tier_policy(struct usb_device *udev,
> + enum usb3_link_state state)
> +{
> + struct usb_device *parent;
> + unsigned int num_hubs;
> +
> + /* Don't enable U1/U2 if the device is on an external hub. */
> + for (parent = udev->parent, num_hubs = 0; parent->parent;
> + parent = parent->parent)
> + num_hubs++;
> +
> + if (num_hubs < 1)
> + return 0;
> +
> + dev_dbg(&udev->dev, "Disabling U1/U2 link state for device"
> + " below external hub.\n");
> + dev_dbg(&udev->dev, "Plug device into root hub "
> + "to decrease power consumption.\n");
Please don't break up the message strings.
[...]
> @@ -4965,6 +4986,8 @@ static int xhci_check_tier_policy(struct xhci_hcd *xhci,
> {
> if (xhci->quirks & XHCI_INTEL_HOST)
> return xhci_check_intel_tier_policy(udev, state);
> + else if (xhci->quirks & XHCI_ZHAOXIN_HOST)
*else* not needed after *return*.
> + return xhci_check_zhaoxin_tier_policy(udev, state);
> else
> return 0;
> }
MBR, Sergey
