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

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Date:   Mon, 4 Dec 2023 16:22:04 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     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>
CC:     "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

 
> 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>
Acked-by: Avri Altman <avri.altman@....com>

> ---
>  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)
>  {
>         if (!host->retune_paused) {
>                 host->retune_paused = 1;
> -               mmc_retune_needed(host);
> +               if (retune)
> +                       mmc_retune_needed(host);
>                 mmc_retune_hold(host);
>         }
>  }
> diff --git a/drivers/mmc/core/host.h b/drivers/mmc/core/host.h index
> 48c4952512a5..321776b52270 100644
> --- a/drivers/mmc/core/host.h
> +++ b/drivers/mmc/core/host.h
> @@ -18,7 +18,7 @@ void mmc_retune_disable(struct mmc_host *host);
> void mmc_retune_hold(struct mmc_host *host);  void
> mmc_retune_release(struct mmc_host *host);  int mmc_retune(struct
> mmc_host *host); -void mmc_retune_pause(struct mmc_host *host);
> +void mmc_retune_pause(struct mmc_host *host, bool retune);
>  void mmc_retune_unpause(struct mmc_host *host);
> 
>  static inline void mmc_retune_clear(struct mmc_host *host)
> --
> 2.34.1