mmc: rtsx_pci_sdmmc: ignore broken write-protect on ThinkPad X260

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The Realtek RTS522A card reader in the Lenovo ThinkPad X260
(subsystem 17aa:504a) incorrectly reports inserted SD cards as
write-protected.

This causes the MMC core to expose the card as read-only:

  mmcblk0: mmc0:aaaa SN256 238 GiB (ro)

and /sys/block/mmcblk0/ro reports 1.

Setting MMC_CAP2_NO_WRITE_PROTECT makes the card writable again.
Limit the quirk to the affected Lenovo subsystem.

Assisted-by: ChatGPT:GPT-5.6 Sol
Signed-off-by: Florian Maillard <florian.maillard@mailoo.org>
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulfh@kernel.org>

...

This commit is contained in:

Florian Maillard 2026-08-24 08:57:55 +02:00 • committed by Ulf Hansson

parent 53823e2579

commit 9c182bc5d7

1 changed files with 5 additions and 0 deletions

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drivers/mmc/host/rtsx_pci_sdmmc.c

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