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Date:   Wed, 28 Jul 2021 19:46:32 +0200
From:   Niklaus vimja Hofer <lkml@vimja.email>
To:     LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 5.13 024/800] usb: renesas-xhci: Fix handling of unknown
 ROM state
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Hi,

On Mon, 2021-07-19 10:28, Justin Forbes wrote:
> On Sat, Jul 17, 2021 at 2:48 PM Moritz Fischer <mdf@kernel.org> wrote:
> >
> > On Sat, Jul 17, 2021 at 07:34:51PM +0200, Greg Kroah-Hartman wrote:
> > > On Sat, Jul 17, 2021 at 08:39:19AM -0500, Justin Forbes wrote:
> > > > On Mon, Jul 12, 2021 at 2:31 AM Greg Kroah-Hartman
> > > > <gregkh@linuxfoundation.org> wrote:
> > > > >
> > > > > From: Moritz Fischer <mdf@kernel.org>
> > > > >
> > > > > commit d143825baf15f204dac60acdf95e428182aa3374 upstream.
> > > > >
> > > > > The ROM load sometimes seems to return an unknown status
> > > > > (RENESAS_ROM_STATUS_NO_RESULT) instead of success / fail.
> > > > >
> > > > > If the ROM load indeed failed this leads to failures when trying to
> > > > > communicate with the controller later on.
> > > > >
> > > > > Attempt to load firmware using RAM load in those cases.
> > > > >
> > > > > Fixes: 2478be82de44 ("usb: renesas-xhci: Add ROM loader for uPD720201")
> > > > > Cc: stable@vger.kernel.org
> > > > > Cc: Mathias Nyman <mathias.nyman@intel.com>
> > > > > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > > > > Cc: Vinod Koul <vkoul@kernel.org>
> > > > > Tested-by: Vinod Koul <vkoul@kernel.org>
> > > > > Reviewed-by: Vinod Koul <vkoul@kernel.org>
> > > > > Signed-off-by: Moritz Fischer <mdf@kernel.org>
> > > > > Link: https://lore.kernel.org/r/20210615153758.253572-1-mdf@kernel.org
> > > > > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > > > >
> > > >
> > > > After sending out 5.12.17 for testing, we had a user complain that all
> > > > of their USB devices disappeared with the error:
> > > >
> > > > Jul 15 23:18:53 kernel: xhci_hcd 0000:04:00.0: Direct firmware load
> > > > for renesas_usb_fw.mem failed with error -2
> > > > Jul 15 23:18:53 kernel: xhci_hcd 0000:04:00.0: request_firmware failed: -2
> > > > Jul 15 23:18:53 kernel: xhci_hcd: probe of 0000:04:00.0 failed with error -2
> > > >
> > > > After first assuming that something was missing in the backport to
> > > > 5.12, I had the user try 5.13.2, and then 5.14-rc1. Both of those
> > > > failed in the same way, so it is not working in the current Linus tree
> > > > either.  Reverting this patch fixed the issue.
> > >
> > > Can you send a revert for this so I can get that into Linus's tree and
> > > then all stable releases as well?
> > >
> > > thanks,
> > >
> > > greg k-h
> >
> > Me or Justin? I can do it. This is annoying my system doesn't work
> > without this :-(
> >
> > Back to the drawing board I guess ...
> >
> > Justin, any idea if your customer had the eeprom populated and
> > programmed or not, just as additional datapoint.
> 
> I am not sure, but I did have another user chime in on the bug saying
> the test kernel with the revert fixed their system as well. It was a
> T14s AMD
> Generation_1. The original reporter had a ASUS System Product
> Name/PRIME H370M-PLUS, BIOS 2801 04/13/2021.

This solved the same issue on my T14 AMD Gen 1 (non-s variant). I was
using 5.13.5 where it was not working and I was able to observe the same
error message in `dmesg`. Reverted the patch, recompiled, rebooted and
now it's working just fine.

Sincerely
-- 
Niklaus 'vimja' Hofer
ig@vimja.email
xmpp: vimja@xmpp.honet.ch