linux-kernel - Re: [PATCH V2 1/2] mmc: mmci: send stop command if sbc error issue

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Date:   Wed, 5 Dec 2018 15:23:33 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Ludovic Barre <ludovic.Barre@...com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH V2 1/2] mmc: mmci: send stop command if sbc error issue

On Tue, 20 Nov 2018 at 10:42, Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> On 7 November 2018 at 10:30, Ludovic Barre <ludovic.Barre@...com> wrote:
> > From: Ludovic Barre <ludovic.barre@...com>
> >
> > Refer to "4.15 set block count command" of sd specification:
> > Host needs to issue CMD12 if any error is detected in
> > the CMD18 and CMD25 operations.
> >
> > In sbc case, the data->stop is fill by framework.
> >
> > Signed-off-by: Ludovic Barre <ludovic.barre@...com>
> > ---
> >  drivers/mmc/host/mmci.c | 5 ++---
> >  1 file changed, 2 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
> > index 82bab35..13fa640 100644
> > --- a/drivers/mmc/host/mmci.c
> > +++ b/drivers/mmc/host/mmci.c
> > @@ -1190,11 +1190,10 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
> >                         /* The error clause is handled above, success! */
> >                         data->bytes_xfered = data->blksz * data->blocks;
> >
> > -               if (!data->stop || host->mrq->sbc) {
> > +               if (!data->stop || (host->mrq->sbc && !data->error))
> >                         mmci_request_end(host, data->mrq);
> > -               } else {
> > +               else
> >                         mmci_start_command(host, data->stop, 0);
>
> This looks correct to me!
>
> Although, just wanted to double check that you tested this for a case
> where we have host->mrq->sbc set and got an error in data->error? I
> guess it can be tricky, so I was thinking of manually trying to
> instruct the code, to set an error in data->error, at some point to
> trigger this code. That would at least give us some confidence that it
> works as expected.

I did some manual tests to trigger the error path. As far as I can
tell, it works as expected and I observes that the core is able to
recover and re-send the request.

[...]

So, I have added my tested-by tag and applied this for next. Thanks!

In regards to patch2/2 I am awaiting your update.

Kind regards
Uffe