misc: rtsx_usb: avoid USB I/O in runtime autosuspend

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The runtime autosuspend callback currently queries card status and
clears OCP by issuing USB register accesses. This can run from the
USB runtime-PM path itself, which is the wrong place to start more
device I/O.

Keep a cached copy of the card-status bits from normal status reads
instead. During runtime autosuspend, use that cached value only to
preserve the existing Memory Stick autosuspend deferral.

Do not treat raw SD_CD as an autosuspend blocker, because tray-based
SD readers can assert SD_CD with an empty tray. A real SD card is
protected by the SD/MMC child runtime-PM usage once powered.

Also stop clearing OCP from the runtime autosuspend callback, so the
callback does not issue USB commands.

Fixes: bb400d2120 ("mfd: rtsx_usb: Defer autosuspend while card exists")
Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ulf Hansson <ulfh@kernel.org>

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Sean Rhodes 2026-07-06 16:40:43 +01:00 • committed by Ulf Hansson

parent ba1da04104

commit 483c948324

2 changed files with 23 additions and 6 deletions

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26

drivers/misc/cardreader/rtsx_usb.c

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3

include/linux/rtsx_usb.h

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