linux-kernel - Re: [PATCH] mmc: core: Add new flag to force hardware reset

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Date:   Mon, 25 Sep 2023 15:59:37 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Michael Wu <michael@...winnertech.com>,
        Wenchao Chen <wenchao.chen666@...il.com>
Cc:     adrian.hunter@...el.com, jinpu.wang@...os.com,
        victor.shih@...esyslogic.com.tw, avri.altman@....com,
        asuk4.q@...il.com, f.fainelli@...il.com, beanhuo@...ron.com,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sarthak Garg <quic_sartgarg@...cinc.com>
Subject: Re: [PATCH] mmc: core: Add new flag to force hardware reset

- trimmed cc-list, + Sartak Garg

On Thu, 14 Sept 2023 at 10:00, Wenchao Chen <wenchao.chen666@...il.com> wrote:
>
> On Thu, 14 Sept 2023 at 08:04, Michael Wu <michael@...winnertech.com> wrote:
> >
> > Entering the recovery system itself indicates a transmission error.
> > In this situation, we intend to execute the mmc_blk_reset function
> > to clear any anomalies that may be caused by errors. We have previously
> > discussed with several MMC device manufacturers, and they expressed
> > their desire for us to reset the device when errors occur to ensure
> > stable operation. We aim to make this code compatible with all devices
> > and ensure its stable performance, so we would like to add this patch
> >
> > Signed-off-by: Michael Wu <michael@...winnertech.com>
>
> like: https://lore.kernel.org/linux-mmc/20220603051534.22672-1-quic_sartgarg@quicinc.com/

Looks like this series didn't make it. I was awaiting a rebase from
Sartak to apply it, but apparently something got in his way for a new
submission.

>
> You should enable it in the vendor host.

Yes! We don't want unused code in the core. We need a user of it too.

May I suggest that you pick up Sartak's patch for the core and thus
add another patch for the host driver you care about and then
re-submit it as a small series.

Kind regards
Uffe

>
> > ---
> >  drivers/mmc/core/block.c | 2 +-
> >  include/linux/mmc/host.h | 1 +
> >  2 files changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> > index b5b414a71e0b..29fbe0ddeadb 100644
> > --- a/drivers/mmc/core/block.c
> > +++ b/drivers/mmc/core/block.c
> > @@ -1503,7 +1503,7 @@ void mmc_blk_cqe_recovery(struct mmc_queue *mq)
> >         pr_debug("%s: CQE recovery start\n", mmc_hostname(host));
> >
> >         err = mmc_cqe_recovery(host);
> > -       if (err)
> > +       if (err || host->cqe_recovery_reset_always)
> >                 mmc_blk_reset(mq->blkdata, host, MMC_BLK_CQE_RECOVERY);
> >         mmc_blk_reset_success(mq->blkdata, MMC_BLK_CQE_RECOVERY);
> >
> > diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> > index 62a6847a3b6f..f578541a06b5 100644
> > --- a/include/linux/mmc/host.h
> > +++ b/include/linux/mmc/host.h
> > @@ -518,6 +518,7 @@ struct mmc_host {
> >         int                     cqe_qdepth;
> >         bool                    cqe_enabled;
> >         bool                    cqe_on;
> > +       bool                    cqe_recovery_reset_always;
> >
> >         /* Inline encryption support */
> >  #ifdef CONFIG_MMC_CRYPTO
> > --
> > 2.29.0
> >