kernel/linux.git/include/linux/mmc/card.h, branch v6.19.11

mmc: core: Skip to set the default 200mA SD current limit

2025-10-23T14:07:21+00:00

Let's avoid updating the SD current limit when the maximum power is 200mA (0.72W) or less, as this is already the default value for the SD card. In this way we avoid sending an unnecessary command during initialization. Signed-off-by: Avri Altman Signed-off-by: Ulf Hansson

mmc: Add quirk to disable DDR50 tuning

2025-05-14T14:59:16+00:00

Adds the MMC_QUIRK_NO_UHS_DDR50_TUNING quirk and updates mmc_execute_tuning() to return 0 if that quirk is set. This fixes an issue on certain Swissbit SD cards that do not support DDR50 tuning where tuning requests caused I/O errors to be thrown. Signed-off-by: Erick Shepherd Acked-by: Adrian Hunter Link: https://lore.kernel.org/r/20250331221337.1414534-1-erick.shepherd@ni.com Signed-off-by: Ulf Hansson

mmc: core: Add definitions for SD UHS-II cards

2024-10-14T10:40:10+00:00

Add UHS-II specific data structures for commands and defines for registers, as described in Part 1 UHS-II Addendum Version 1.01. UHS-II related definitions are listed below: 1. UHS-II card capability: sd_uhs2_caps{} 2. UHS-II configuration: sd_uhs2_config{} 3. UHS-II register I/O address and register field definitions: sd_uhs2.h Signed-off-by: Jason Lai Signed-off-by: Victor Shih Link: https://lore.kernel.org/r/20240913102836.6144-6-victorshihgli@gmail.com Signed-off-by: Ulf Hansson

mmc: core: Prepare to support SD UHS-II cards

2024-10-14T10:40:10+00:00

The SD UHS-II interface was introduced to the SD spec v4.00 several years ago. The interface is fundamentally different from an electrical and a protocol point of view, comparing to the legacy SD interface. However, the legacy SD protocol is supported through a specific transport layer (SD-TRAN) defined in the UHS-II addendum of the spec. This allows the SD card to be managed in a very similar way as a legacy SD card, hence a lot of code can be re-used to support these new types of cards through the mmc subsystem. Moreover, an SD card that supports the UHS-II interface shall also be backwards compatible with the legacy SD interface, which allows a UHS-II card to be inserted into a legacy slot. As a matter of fact, this is already supported by mmc subsystem as of today. To prepare to add support for UHS-II, this change puts the basic foundation in the mmc core in place, allowing it to be more easily reviewed before subsequent changes implements the actual support. Basically, the approach here adds a new UHS-II bus_ops type and adds a separate initialization path for the UHS-II card. The intent is to avoid us from sprinkling the legacy initialization path, but also to simplify implementation of the UHS-II specific bits. At this point, there is only one new host ops added to manage the various ios settings needed for UHS-II. Additional host ops that are needed, are being added from subsequent changes. Signed-off-by: Ulf Hansson Link: https://lore.kernel.org/r/20240913102836.6144-3-victorshihgli@gmail.com

mmc: sd: SDUC Support Recognition

2024-10-14T10:29:01+00:00

Ultra Capacity SD cards (SDUC) was already introduced in SD7.0. Those cards support capacity larger than 2TB and up to including 128TB. ACMD41 was extended to support the host-card handshake during initialization. The card expects that the HCS & HO2T bits to be set in the command argument, and sets the applicable bits in the R3 returned response. On the contrary, if a SDUC card is inserted to a non-supporting host, it will never respond to this ACMD41 until eventually, the host will timed out and give up. Also, add SD CSD version 3.0 - designated for SDUC, and properly parse the csd register as the c_size field got expanded to 28 bits. Do not enable SDUC for now - leave it to the last patch in the series. Tested-by: Ricky WU Reviewed-by: Adrian Hunter Signed-off-by: Avri Altman Link: https://lore.kernel.org/r/20241006051148.160278-2-avri.altman@wdc.com Signed-off-by: Ulf Hansson

mmc: core: Add SD card quirk for broken poweroff notification

2024-10-14T10:29:00+00:00

GIGASTONE Gaming Plus microSD cards manufactured on 02/2022 report that they support poweroff notification and cache, but they are not working correctly. Flush Cache bit never gets cleared in sd_flush_cache() and Poweroff Notification Ready bit also never gets set to 1 within 1 second from the end of busy of CMD49 in sd_poweroff_notify(). This leads to I/O error and runtime PM error state. I observed that the same card manufactured on 01/2024 works as expected. This problem seems similar to the Kingston cards fixed with commit c467c8f08185 ("mmc: Add MMC_QUIRK_BROKEN_SD_CACHE for Kingston Canvas Go Plus from 11/2019") and should be handled using quirks. CID for the problematic card is here. 12345641535443002000000145016200 Manufacturer ID is 0x12 and defined as CID_MANFID_GIGASTONE as of now, but would like comments on what naming is appropriate because MID list is not public and not sure it's right. Signed-off-by: Keita Aihara Link: https://lore.kernel.org/r/20240913094417.GA4191647@sony.com Signed-off-by: Ulf Hansson

mmc: core: Add wp_grp_size sysfs node

2024-01-02T16:54:05+00:00

The eMMC card can be set into write-protected mode to prevent data from being accidentally modified or deleted. Wp_grp_size (Write Protect Group Size) refers to an attribute of the eMMC card, used to manage write protection and is the CSD register [36:32] of the eMMC device. Wp_grp_size (Write Protect Group Size) indicates how many eMMC blocks are contained in each write protection group on the eMMC card. To allow userspace easy access of the CSD register bits, let's add sysfs node "wp_grp_size". Signed-off-by: Lin Gui Signed-off-by: Bo Ye Reviewed-by: AngeloGioacchino Del Regno Link: https://lore.kernel.org/r/20231218230532.82427-1-bo.ye@mediatek.com Signed-off-by: Ulf Hansson

mmc: core: Remove packed command leftovers

2023-12-07T13:08:44+00:00

Packed commands support was removed long time ago, but some bits got left behind. Remove them. Signed-off-by: Avri Altman Link: https://lore.kernel.org/r/20231030062226.1895692-1-avri.altman@wdc.com Signed-off-by: Ulf Hansson

mmc: Add quirk MMC_QUIRK_BROKEN_CACHE_FLUSH for Micron eMMC Q2J54A

2023-11-03T11:01:32+00:00

Micron MTFC4GACAJCN eMMC supports cache but requires that flush cache operation be allowed only after a write has occurred. Otherwise, the cache flush command or subsequent commands will time out. Signed-off-by: Bean Huo Signed-off-by: Rafael Beims Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20231030224809.59245-1-beanhuo@iokpp.de Signed-off-by: Ulf Hansson

mmc: Add MMC_QUIRK_BROKEN_SD_CACHE for Kingston Canvas Go Plus from 11/2019

2023-06-20T11:19:34+00:00

This microSD card never clears Flush Cache bit after cache flush has been started in sd_flush_cache(). This leads e.g. to failure to mount file system. Add a quirk which disables the SD cache for this specific card from specific manufacturing date of 11/2019, since on newer dated cards from 05/2023 the cache flush works correctly. Fixes: 08ebf903af57 ("mmc: core: Fixup support for writeback-cache for eMMC and SD") Signed-off-by: Marek Vasut Link: https://lore.kernel.org/r/20230620102713.7701-1-marex@denx.de Signed-off-by: Ulf Hansson