linux-kernel - Re: [PATCH v2 3/3] USB: Disable LPM on WD19's Realtek Hub

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Date:   Fri, 10 Jan 2020 10:40:29 -0500 (EST)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
cc:     mathias.nyman@...el.com, <gregkh@...uxfoundation.org>,
        <acelan.kao@...onical.com>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] USB: Disable LPM on WD19's Realtek Hub

On Fri, 10 Jan 2020, Kai-Heng Feng wrote:

> Realtek Hub (0bda:0x0487) used in Dell Dock WD19 sometimes drops off the
> bus when bringing underlying ports from U3 to U0.
> 
> Disabling LPM on the hub during setting link state is not enough, so
> let's disable LPM completely for this hub.
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---
>  drivers/usb/core/quirks.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
> index 6b6413073584..2fb7c1602280 100644
> --- a/drivers/usb/core/quirks.c
> +++ b/drivers/usb/core/quirks.c
> @@ -371,6 +371,9 @@ static const struct usb_device_id usb_quirk_list[] = {
>  	{ USB_DEVICE(0x0b05, 0x17e0), .driver_info =
>  			USB_QUIRK_IGNORE_REMOTE_WAKEUP },
>  
> +	/* Realtek hub in Dell WD19 (Type-C) */
> +	{ USB_DEVICE(0x0bda, 0x0487), .driver_info = USB_QUIRK_NO_LPM },
> +
>  	/* Action Semiconductor flash disk */
>  	{ USB_DEVICE(0x10d6, 0x2200), .driver_info =
>  			USB_QUIRK_STRING_FETCH_255 },
> 

This is a very partial patch.  There were four hunks in the original 
version but there's only one hunk in V2.

Alan Stern