linux-kernel - Re: [PATCH 1/2] fsi/sbefifo: Clean up correct FIFO when receiving reset request from SBE

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Message-ID: <CACPK8XeddtzwL+zwOWwkyYKCSYg7m=jHR1gpoOG6qx2gDjcosQ@mail.gmail.com>
Date:   Thu, 10 Sep 2020 03:08:56 +0000
From:   Joel Stanley <joel@....id.au>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     linux-fsi@...ts.ozlabs.org, Joachim Fenkes <FENKES@...ibm.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jeremy Kerr <jk@...abs.org>,
        Alistar Popple <alistair@...ple.id.au>,
        Eddie James <eajames@...ux.ibm.com>
Subject: Re: [PATCH 1/2] fsi/sbefifo: Clean up correct FIFO when receiving
 reset request from SBE

On Mon, 27 Jul 2020 at 05:51, Benjamin Herrenschmidt
<benh@...nel.crashing.org> wrote:
>
> On Fri, 2020-07-24 at 16:45 +0930, Joel Stanley wrote:
> > From: Joachim Fenkes <FENKES@...ibm.com>
> >
> > When the SBE requests a reset via the down FIFO, that is also the
> > FIFO we should go and reset ;)
>
> Is it ?
>
> I no longer work for IBM and dont have access to any of the
> documentation here but I had vague memories that we would get a reset
> request in the down fifo in order to reset the up one since we control
> the up one and the host controls the down one, no ?

Joachim, can you clarify the situation here?

>
> > Fixes: 9f4a8a2d7f9d ("fsi/sbefifo: Add driver for the SBE FIFO")
> > Signed-off-by: Joachim Fenkes <FENKES@...ibm.com>
> > Signed-off-by: Joel Stanley <joel@....id.au>
> > ---
> >  drivers/fsi/fsi-sbefifo.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/fsi/fsi-sbefifo.c b/drivers/fsi/fsi-sbefifo.c
> > index f54df9ebc8b3..655b45c1f6ba 100644
> > --- a/drivers/fsi/fsi-sbefifo.c
> > +++ b/drivers/fsi/fsi-sbefifo.c
> > @@ -400,7 +400,7 @@ static int sbefifo_cleanup_hw(struct sbefifo
> > *sbefifo)
> >       /* The FIFO already contains a reset request from the SBE ? */
> >       if (down_status & SBEFIFO_STS_RESET_REQ) {
> >               dev_info(dev, "Cleanup: FIFO reset request set,
> > resetting\n");
> > -             rc = sbefifo_regw(sbefifo, SBEFIFO_UP,
> > SBEFIFO_PERFORM_RESET);
> > +             rc = sbefifo_regw(sbefifo, SBEFIFO_DOWN,
> > SBEFIFO_PERFORM_RESET);
> >               if (rc) {
> >                       sbefifo->broken = true;
> >                       dev_err(dev, "Cleanup: Reset reg write failed,
> > rc=%d\n", rc);
>