linux-kernel - Re: [PATCH] mmc: rpmb: do not force a retune before RPMB switch

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Date:   Mon, 4 Dec 2023 19:14:01 +0100
From:   "Jorge Ramirez-Ortiz, Foundries" <jorge@...ndries.io>
To:     Avri Altman <Avri.Altman@....com>
Cc:     Jorge Ramirez-Ortiz <jorge@...ndries.io>,
        "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "christian.loehle@....com" <christian.loehle@....com>,
        "jinpu.wang@...os.com" <jinpu.wang@...os.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "yibin.ding@...soc.com" <yibin.ding@...soc.com>,
        "victor.shih@...esyslogic.com.tw" <victor.shih@...esyslogic.com.tw>,
        "asuk4.q@...il.com" <asuk4.q@...il.com>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "yangyingliang@...wei.com" <yangyingliang@...wei.com>,
        "yebin10@...wei.com" <yebin10@...wei.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: rpmb: do not force a retune before RPMB switch

On 04/12/23 17:58:45, Avri Altman wrote:
> >
> > Requesting a retune before switching to the RPMB partition has been
> > observed to cause CRC errors on the RPMB reads (-EILSEQ).
> >
> > Since RPMB reads can not be retried, the clients would be directly affected by
> > the errors.
> >
> > This commit disables the request prior to RPMB switching while allowing the
> > pause interface to still request a retune before the pause for other use cases.
> >
> > This was verified with the sdhci-of-arasan driver (ZynqMP) configured for
> > HS200 using two separate eMMC cards (DG4064 and 064GB2). In both cases,
> > the error was easy to reproduce triggering every few tenths of reads.
> >
> > Signed-off-by: Jorge Ramirez-Ortiz <jorge@...ndries.io>
> > ---
> >  drivers/mmc/core/block.c | 2 +-
> >  drivers/mmc/core/host.c  | 7 ++++---
> >  drivers/mmc/core/host.h  | 2 +-
> >  3 files changed, 6 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index
> > f9a5cffa64b1..1d69078ad9b2 100644
> > --- a/drivers/mmc/core/block.c
> > +++ b/drivers/mmc/core/block.c
> > @@ -859,7 +859,7 @@ static int mmc_blk_part_switch_pre(struct mmc_card
> > *card,
> >                         if (ret)
> >                                 return ret;
> >                 }
> > -               mmc_retune_pause(card->host);
> > +               mmc_retune_pause(card->host, false);
> >         }
> >
> >         return ret;
> > diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c index
> > 096093f7be00..a9b95aaa2235 100644
> > --- a/drivers/mmc/core/host.c
> > +++ b/drivers/mmc/core/host.c
> > @@ -119,13 +119,14 @@ void mmc_retune_enable(struct mmc_host *host)
> >
> >  /*
> >   * Pause re-tuning for a small set of operations.  The pause begins after the
> > - * next command and after first doing re-tuning.
> > + * next command and, if retune is set, after first doing re-tuning.
> >   */
> > -void mmc_retune_pause(struct mmc_host *host)
> > +void mmc_retune_pause(struct mmc_host *host, bool retune)
> >  {
> Since mmc_blk_part_switch_pre is the only caller of mmc_retune_pause,
> How about just move those lines into it?

+1 from me

I wasnt sure if there was some other plan for mmc_retune_pause in the
future hence why I didnt remove it and extended it instead.

Should I wait for Adrian's confirmation or just go ahead?.