linux-kernel - Re: [PATCH 3/3] xhci: Set HCD flag to defer primary roothub registration

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Date:   Wed, 25 Aug 2021 20:16:53 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Alan Stern <stern@...land.harvard.edu>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <chris.chiu@...onical.com>, <lokeshvutla@...com>
Subject: Re: [PATCH 3/3] xhci: Set HCD flag to defer primary roothub
 registration

Hi,

On 25/08/21 4:21 pm, Kishon Vijay Abraham I wrote:
> Set "HCD_FLAG_DEFER_PRI_RH_REGISTER" to hcd->flags in xhci_run() to defer
> registering primary roothub in usb_add_hcd(). This will make sure both
> primary roothub and secondary roothub will be registered along with the
> second HCD. This is required for cold plugged USB devices to be detected
> in certain PCIe USB cards (like Inateck USB card connected to AM64 EVM
> or J7200 EVM).
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> Suggested-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
> ---
>  drivers/usb/host/xhci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index 3618070eba78..9b7d968022c8 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -644,7 +644,6 @@ int xhci_run(struct usb_hcd *hcd)
>  	/* Start the xHCI host controller running only after the USB 2.0 roothub
>  	 * is setup.
>  	 */
> -

I just realized I've left a spurious space here. While fixing Alan's
comment, I'll fix this one.

Regards,
Kishon
>  	hcd->uses_new_polling = 1;
>  	if (!usb_hcd_is_primary_hcd(hcd))
>  		return xhci_run_finished(xhci);
> @@ -692,6 +691,7 @@ int xhci_run(struct usb_hcd *hcd)
>  		if (ret)
>  			xhci_free_command(xhci, command);
>  	}
> +	set_bit(HCD_FLAG_DEFER_PRI_RH_REGISTER, &hcd->flags);
>  	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
>  			"Finished xhci_run for USB2 roothub");
>  
>