| Message ID | 7ECE325975663D2D+20250104155111.100597-1-wangyuli@uniontech.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] usb: host: xhci-plat: Assign shared_hcd->rsrc_start | expand |
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c index e6c9006bd568..457e839b9b53 100644 --- a/drivers/usb/host/xhci-plat.c +++ b/drivers/usb/host/xhci-plat.c @@ -329,6 +329,8 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s usb3_hcd->can_do_streams = 1; if (xhci->shared_hcd) { + xhci->shared_hcd->rsrc_start = hcd->rsrc_start; + xhci->shared_hcd->rsrc_len = hcd->rsrc_len; ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED); if (ret) goto put_usb3_hcd;
When inserting a USB device, examining hcd->rsrc_start can be helpful in identifying which hcd is mounted, as the physical address represented here is typically unique. The following code snippet demonstrates this: struct usb_hcd *hcd = bus_to_hcd(udev->bus); unsigned long long usb_hcd_addr = (unsigned long long)hcd->rsrc_start; However, this approach has limitations now. For USB hosts with an MMIO interface, the effectiveness of this method is restricted to USB 2.0. Becase commit 3429e91a661e ("usb: host: xhci: add platform driver support") assigned res->start to hcd->rsrc_start. But shared_hcd->rsrc_start remains unassigned, which is also necessary in certain scenarios. Co-developed-by: Xu Rao <raoxu@uniontech.com> Signed-off-by: Xu Rao <raoxu@uniontech.com> Signed-off-by: WangYuli <wangyuli@uniontech.com> -- Changlog: v1 -> v2: Move code changes for commit e0fe986972f5 ("usb: host: xhci-plat: prepare operation w/o shared hcd"). --- drivers/usb/host/xhci-plat.c | 2 ++ 1 file changed, 2 insertions(+)