linux-kernel - Re: [PATCH] mmc: core: disable TRIM on Kingston EMMC04G-M627

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Date:   Tue, 20 Jun 2023 12:14:03 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Robert Marko <robimarko@...il.com>
Cc:     windhl@....com, avri.altman@....com, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: core: disable TRIM on Kingston EMMC04G-M627

On Mon, 19 Jun 2023 at 21:36, Robert Marko <robimarko@...il.com> wrote:
>
> It seems that Kingston EMMC04G-M627 despite advertising TRIM support does
> not work when the core is trying to use REQ_OP_WRITE_ZEROES.
>
> We are seeing I/O errors in OpenWrt under 6.1 on Zyxel NBG7815 that we did
> not previously have and tracked it down to REQ_OP_WRITE_ZEROES.
>
> Trying to use fstrim seems to also throw errors like:
> [93010.835112] I/O error, dev loop0, sector 16902 op 0x3:(DISCARD) flags 0x800 phys_seg 1 prio class 2
>
> Disabling TRIM makes the error go away, so lets add a quirk for this eMMC
> to disable TRIM.
>
> Signed-off-by: Robert Marko <robimarko@...il.com>

Applied for next and by adding a stable tag, thanks!

Kind regards
Uffe


> ---
>  drivers/mmc/core/quirks.h | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/mmc/core/quirks.h b/drivers/mmc/core/quirks.h
> index 77caa0c903f8..8decb788a3db 100644
> --- a/drivers/mmc/core/quirks.h
> +++ b/drivers/mmc/core/quirks.h
> @@ -107,6 +107,13 @@ static const struct mmc_fixup __maybe_unused mmc_blk_fixups[] = {
>         MMC_FIXUP("Q2J54A", CID_MANFID_MICRON, 0x014e, add_quirk_mmc,
>                   MMC_QUIRK_TRIM_BROKEN),
>
> +       /*
> +        * Kingston EMMC04G-M627 advertises TRIM but it does not seems to
> +        * support being used to offload WRITE_ZEROES.
> +        */
> +       MMC_FIXUP("M62704", CID_MANFID_KINGSTON, 0x0100, add_quirk_mmc,
> +                 MMC_QUIRK_TRIM_BROKEN),
> +
>         /*
>          * Some SD cards reports discard support while they don't
>          */
> --
> 2.41.0
>