Re: [PATCH] xhci: Reset controller on xhci shutdown

[Mathias Nyman <mathias.nyman@linux.intel.com>]

Hi

On 10/2/26 01:25, wenxiong@linux.ibm.com wrote:
> From: Wen Xiong <wenxiong@linux.ibm.com>
> 
> Fixes kexec boot. Without a hard reset, some USB chips will fail to
> initialize in a kexec booted kernel.
> 
> Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
> Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
> Signed-off-by: Joel Stanley <joel@jms.id.au>
> Signed-off-by: Wen Xiong <wenxiong@linux.ibm.com>
> ---
>   drivers/usb/host/xhci.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index a9e47e178c28..364bd61a4bd7 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -781,6 +781,9 @@ void xhci_shutdown(struct usb_hcd *hcd)
>   	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
>   			"xhci_shutdown completed - status = %x",
>   			readl(&xhci->op_regs->status));
> +
> +	/* TI XHCI controllers do not come back after kexec without this hack */
> +	pci_reset_function_locked(to_pci_dev(hcd->self.sysdev));
>   }
>   EXPORT_SYMBOL_GPL(xhci_shutdown);
>   

Should be added to xhci-pci.c: xhci_pci_shutdown() instead.

Probably also limited to that specific TI xHC controller

Thanks
Mathias