linux-kernel - [PATCH V1 0/1] Export an API to reinit SDIO card

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Message-ID: <20250721094328.6556-1-quic_sayalil@quicinc.com>
Date: Mon, 21 Jul 2025 15:13:27 +0530
From: Sayali Lokhande <quic_sayalil@...cinc.com>
To: <ulf.hansson@...aro.org>, <wsa+renesas@...g-engineering.com>,
        <avri.altman@....com>, <adrian.hunter@...el.com>,
        <shawn.lin@...k-chips.com>
CC: <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH V1 0/1] Export an API to reinit SDIO card

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.

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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