linux-kernel - Re: [PATCH v3 1/2] USB: quirks: Check device interface LPM capability

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Message-ID: <20190110154909.GB142026@google.com>
Date:   Thu, 10 Jan 2019 10:49:09 -0500
From:   Kyle Williams <kdgwill@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Alan Stern <stern@...land.harvard.edu>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Jon Flatley <jflat@...omium.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH v3 1/2] USB: quirks: Check device interface LPM capability

On Wed, Dec 12, 2018 at 12:37:09PM +0100, Greg Kroah-Hartman wrote:
> On Fri, Dec 07, 2018 at 08:47:21PM -0500, Kyle Williams wrote:
> > From: Kyle Williams <kdgwill@...omium.org>
> > 
> > Description: enable the ability to disable LPM for all devices matched
> > by interface information
> 
> Why have "Description:" in here?  Of course this is the description :)
> 
> And the subject doesn't make much sense, what does this have to do with
> quirks?
> 
> Also, you need more information here in the description about why you
> are doing all of this, as it is, I have no idea why this patch is needed
> at all.
> 
> thanks,
> 
> greg k-h

It seems the underlying issue has been solved in
0472bf0 xhci: Prevent U1/U2 link pm states if exit latency is too long

However, the patch to fix the issue when matching the USB_QUIRK_NO_LPM
quirk by iterface could be useful in the future. Currently nothing will
happen that quirk is matched by interface instead of by vid/pid pair.
Is their anything that would need to be changed besides removing the
Description tag?

-Kyle