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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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5
drivers/mmc/host/rtsx_pci_sdmmc.c
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@ -1425,6 +1425,11 @@ static void realtek_init_host(struct realtek_pci_sdmmc *host)
mmc->caps = mmc->caps | MMC_CAP_AGGRESSIVE_PM;
mmc->caps2 = MMC_CAP2_NO_PRESCAN_POWERUP | MMC_CAP2_FULL_PWR_CYCLE |
MMC_CAP2_NO_SDIO;
if (pcr->pci->device == 0x522a &&
pcr->pci->subsystem_vendor == PCI_VENDOR_ID_LENOVO &&
pcr->pci->subsystem_device == 0x504a)
mmc->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
mmc->max_current_330 = 400;
mmc->max_current_180 = 800;
mmc->ops = &realtek_pci_sdmmc_ops;