| Message ID | 8AC53C0500C2C839+20250104154353.93075-1-wangyuli@uniontech.com |
|---|---|
| State | New |
| Headers | show |
| Series | 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..56a65ddb7e4c 100644 --- a/drivers/usb/host/xhci-plat.c +++ b/drivers/usb/host/xhci-plat.c @@ -328,6 +328,9 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s if (usb3_hcd && HCC_MAX_PSA(xhci->hcc_params) >= 4) usb3_hcd->can_do_streams = 1; + xhci->shared_hcd->rsrc_start = hcd->rsrc_start; + xhci->shared_hcd->rsrc_len = hcd->rsrc_len; + if (xhci->shared_hcd) { ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED); if (ret)
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> --- drivers/usb/host/xhci-plat.c | 3 +++ 1 file changed, 3 insertions(+)