From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Jung Daehwan <dh10.jung@samsung.com>
Cc: Mathias Nyman <mathias.nyman@intel.com>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: usb: host: Reduce xhci_handshake timeout in xhci_reset
Date: Mon, 28 Jun 2021 08:53:02 +0200 [thread overview]
Message-ID: <YNlxzj7KXG43Uyrp@kroah.com> (raw)
In-Reply-To: <20210628022548.GA69289@ubuntu>
On Mon, Jun 28, 2021 at 11:25:48AM +0900, Jung Daehwan wrote:
> On Tue, Jun 22, 2021 at 09:56:20PM +0200, Greg Kroah-Hartman wrote:
> > On Tue, Jun 22, 2021 at 08:24:56PM +0900, Daehwan Jung wrote:
> > > It seems 10 secs timeout is too long in general case. A core would wait for
> > > 10 secs without doing other task and it can be happended on every device.
> >
> > Only if the handshake does not come back sooner, right?
>
> Yes, right.
>
> > What is causing your device to timeout here?
>
> Host Controller doesn't respond handshake. I don't know why and I ask HW team
> to debug it.
Please work to fix your hardware, that feels like the root of the
problem here. If you require the timeout for xhci_reset() to happen,
then how do you know that the hardware really did reset properly in the
reduced amount of time you just provided?
thanks,
greg k-h
next prev parent reply other threads:[~2021-06-28 6:53 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20210622113915epcas2p284c61291fc9d83487f6dfebb65fd4e9b@epcas2p2.samsung.com>
2021-06-22 11:24 ` usb: host: Reduce xhci_handshake timeout in xhci_reset Daehwan Jung
2021-06-22 19:56 ` Greg Kroah-Hartman
2021-06-28 2:25 ` Jung Daehwan
2021-06-28 6:53 ` Greg Kroah-Hartman [this message]
2021-06-28 6:55 ` Jung Daehwan
2021-06-28 7:49 ` Mathias Nyman
2022-02-11 6:46 ` Pavan Kondeti
2022-02-11 7:43 ` Pavan Kondeti
2022-02-14 4:08 ` Pavan Kondeti
2022-02-14 5:22 ` Greg Kroah-Hartman
2022-02-14 5:52 ` Pavan Kondeti
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