linux-kernel - Re: [PATCH] xhci: re-initialize the HC during resume if HCE was set

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Date:   Wed, 29 Dec 2021 09:30:14 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Puma Hsu <pumahsu@...gle.com>
Cc:     mathias.nyman@...el.com, Albert Wang <albertccwang@...gle.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xhci: re-initialize the HC during resume if HCE was set

A: http://en.wikipedia.org/wiki/Top_post
Q: Were do I find info about this thing called top-posting?
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?

A: No.
Q: Should I include quotations after my reply?

http://daringfireball.net/2007/07/on_top

On Wed, Dec 29, 2021 at 01:53:04PM +0800, Puma Hsu wrote:
> This commit is not used to fix a specific commit. We find a condition
> that when XHCI runs the resume process but the HCE flag is set, then
> the Run/Stop bit of USBCMD cannot be set so that HC would not be
> enabled. In fact, HC may already meet a problem at this moment.
> Besides, in xHCI requirements specification revision 1.2, Table 5-21
> BIT(12) claims that Software should re-initialize the xHC when HCE is
> set. Therefore, I think this commit could be the error handling for
> HCE.

So this does not actually fix an issue that you have seen in any device
or testing?  So it is not relevant for older kernels but just "nice to
have"?

How did you test this if you can not duplicate the problem?

thanks,

greg k-h