Re: [PATCH] mmc: core: Kioxia 016G01 does not enter boot mode after SLEEP

[Ulf Hansson]

On Mon, 13 Apr 2026 at 20:06, Florian Fainelli
<florian.fainelli@xxxxxxxxxxxx> wrote:
>
> The Kioxia 016G01 eMMC device does not exit SLEEP mode when sending CMD0
> which prevents the system from properly resuming from S3 warm boot where
> the eMMC is necessary to pull in the boot components.

Is the bug confirmed by Kioxia?

If not, can you explain a bit more what is actually happening during
system resume?

>
> Add a quirk which prevents that specific device model from entering
> SLEEP mode. There are no differences in the power consumption observed.
>
> Signed-off-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>

Kind regards
Uffe

> ---
>  drivers/mmc/core/mmc.c    | 3 ++-
>  drivers/mmc/core/quirks.h | 7 +++++++
>  include/linux/mmc/card.h  | 1 +
>  3 files changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 7c86efb1044a..8471115f7fc9 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -1958,7 +1958,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
>
>  static bool mmc_card_can_sleep(struct mmc_card *card)
>  {
> -       return card->ext_csd.rev >= 3;
> +       return card->ext_csd.rev >= 3 &&
> +              !(card->quirks & MMC_QUIRK_BROKEN_SLEEP);
>  }
>
>  static int mmc_sleep_busy_cb(void *cb_data, bool *busy)
> diff --git a/drivers/mmc/core/quirks.h b/drivers/mmc/core/quirks.h
> index c417ed34c057..dc6badf740f3 100644
> --- a/drivers/mmc/core/quirks.h
> +++ b/drivers/mmc/core/quirks.h
> @@ -153,6 +153,13 @@ static const struct mmc_fixup __maybe_unused mmc_blk_fixups[] = {
>         MMC_FIXUP("M62704", CID_MANFID_KINGSTON, 0x0100, add_quirk_mmc,
>                   MMC_QUIRK_TRIM_BROKEN),
>
> +       /*
> +        * Some Kioxia eMMC devices will not go into boot mode on CMD0 arg
> +        * after going into SLEEP state.
> +        */
> +       MMC_FIXUP("016G01", CID_MANFID_TOSHIBA, 0x0100, add_quirk_mmc,
> +                 MMC_QUIRK_BROKEN_SLEEP),
> +
>         END_FIXUP
>  };
>
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index e9e964c20e53..3812e9e79541 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -329,6 +329,7 @@ struct mmc_card {
>  #define MMC_QUIRK_BROKEN_CACHE_FLUSH   (1<<16) /* Don't flush cache until the write has occurred */
>  #define MMC_QUIRK_BROKEN_SD_POWEROFF_NOTIFY    (1<<17) /* Disable broken SD poweroff notify support */
>  #define MMC_QUIRK_NO_UHS_DDR50_TUNING  (1<<18) /* Disable DDR50 tuning */
> +#define MMC_QUIRK_BROKEN_SLEEP         (1<<19) /* Broken sleep mode */
>
>         bool                    written_flag;   /* Indicates eMMC has been written since power on */
>         bool                    reenable_cmdq;  /* Re-enable Command Queue */
> --
> 2.43.0
>
>