Re: [PATCH V1 0/1] Export an API to reinit SDIO card

[Ulf Hansson]

On Mon, 21 Jul 2025 at 11:43, Sayali Lokhande <quic_sayalil@xxxxxxxxxxx> wrote:
>
> Some SDIO client drivers, manage external power to the SDIO card.
> In such cases, the card may be power-cycled independently of the
> MMC core's runtime PM state.
> Currently, reinitialization of the SDIO card is tied to the runtime
> PM resume path. However, if the card is powered off and on again before
> the autosuspend delay expires, the runtime suspend/resume callbacks are
> not triggered, leaving the card in an uninitialized state.
>
> To address this, export sdio_reinit_card() so that client drivers can
> explicitly trigger reinitialization after powering the card back on,
> ensuring proper device state regardless of runtime PM behavior.
>
> This change enables more robust handling of power-managed SDIO devices
> in scenarios where runtime PM is disabled or insufficient.

Please use mmc_hw|sw_reset() instead.

Kind regards
Uffe

>
> Sayali Lokhande (1):
>   mmc: sdio: Export an API to reinit the SDIO card
>
>  drivers/mmc/core/core.h       | 1 +
>  drivers/mmc/core/sdio.c       | 2 +-
>  drivers/mmc/core/sdio_io.c    | 6 ++++++
>  include/linux/mmc/sdio_func.h | 2 ++
>  4 files changed, 10 insertions(+), 1 deletion(-)
>
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