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References: <20210420134641.57343-1-avri.altman@wdc.com> <20210420134641.57343-3-avri.altman@wdc.com>
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From:   Ulf Hansson <ulf.hansson@linaro.org>
Date:   Fri, 23 Apr 2021 10:14:28 +0200
Message-ID: <CAPDyKFr95yFAbYyRGZMg6UpsUXYxm4c8J0ZRqw2ASdf+bF1edg@mail.gmail.com>
Subject: Re: [PATCH v4 2/2] mmc: block: Update ext_csd.cache_ctrl if it was written
To:     Avri Altman <avri.altman@wdc.com>
Cc:     linux-mmc <linux-mmc@vger.kernel.org>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Tue, 20 Apr 2021 at 15:46, Avri Altman <avri.altman@wdc.com> wrote:
>
> The cache function can be turned ON and OFF by writing to the CACHE_CTRL
> byte (EXT_CSD byte [33]).  However,  card->ext_csd.cache_ctrl is only
> set on init if cache size > 0.
>
> Fix that by explicitly setting ext_csd.cache_ctrl on ext-csd write.
>
> Signed-off-by: Avri Altman <avri.altman@wdc.com>
> Acked-by: Adrian Hunter <adrian.hunter@intel.com>

This can go separate from patch 1, so I have applied this for next and
by adding a stable tag to it.

Thanks and kind regards
Uffe


> ---
>  drivers/mmc/core/block.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> index 24e1ecbdd510..7e70f11e85e2 100644
> --- a/drivers/mmc/core/block.c
> +++ b/drivers/mmc/core/block.c
> @@ -572,6 +572,18 @@ static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
>                 main_md->part_curr = value & EXT_CSD_PART_CONFIG_ACC_MASK;
>         }
>
> +       /*
> +        * Make sure to update CACHE_CTRL in case it was changed. The cache
> +        * will get turned back on if the card is re-initialized, e.g.
> +        * suspend/resume or hw reset in recovery.
> +        */
> +       if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_CACHE_CTRL) &&
> +           (cmd.opcode == MMC_SWITCH)) {
> +               u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg) & 1;
> +
> +               card->ext_csd.cache_ctrl = value;
> +       }
> +
>         /*
>          * According to the SD specs, some commands require a delay after
>          * issuing the command.
> --
> 2.25.1
>