kernel/linux.git/drivers/mmc/core/core.h, branch linux-7.0.y

mmc: core: Add infrastructure for undervoltage handling

2025-08-22T10:08:07+00:00

Implement the core infrastructure to allow MMC bus types to handle REGULATOR_EVENT_UNDER_VOLTAGE events from power regulators. This is primarily aimed at allowing devices like eMMC to perform an emergency shutdown to prevent data corruption when a power failure is imminent. This patch introduces: - A new 'handle_undervoltage' function pointer to 'struct mmc_bus_ops'. Bus drivers (e.g., for eMMC) can implement this to define their emergency procedures. - A workqueue ('uv_work') in 'struct mmc_supply' to handle the event asynchronously in a high-priority context. - A new function 'mmc_handle_undervoltage()' which is called from the workqueue. It stops the host queue to prevent races with card removal, checks for the bus op, and invokes the handler. - Functions to register and unregister the regulator notifier, intended to be called by bus drivers like 'mmc_attach_mmc' when a compatible card is detected. The notifier is only registered for the main vmmc supply, as undervoltage handling for vqmmc or vqmmc2 is not required at this time. Signed-off-by: Oleksij Rempel Link: https://lore.kernel.org/r/20250821130751.2089587-2-o.rempel@pengutronix.de Signed-off-by: Ulf Hansson

mmc: core: add mmc_card_can_cmd23

2025-08-19T12:34:15+00:00

Add a dedicated helper to check for CMD23 support for MMC card, similar to mmc_host_can_cmd23 for the host, as it is easy to get the check wrong. Signed-off-by: Benoît Monin Link: https://lore.kernel.org/r/20250818-mobileye-emmc-for-upstream-4-v4-1-34ecb3995e96@bootlin.com Signed-off-by: Ulf Hansson

mmc: rename mmc_can_trim() to mmc_card_can_trim()

2025-05-14T14:59:17+00:00

mmc_can_* functions sometimes relate to the card and sometimes to the host. Make it obvious by renaming this function to include 'card'. Also, convert to proper bool type while we are here. Signed-off-by: Wolfram Sang Link: https://lore.kernel.org/r/20250401095847.29271-10-wsa+renesas@sang-engineering.com Signed-off-by: Ulf Hansson

mmc: rename mmc_can_secure_erase_trim() to mmc_card_can_secure_erase_trim()

2025-05-14T14:59:17+00:00

mmc_can_* functions sometimes relate to the card and sometimes to the host. Make it obvious by renaming this function to include 'card'. Also, convert to proper bool type while we are here. Signed-off-by: Wolfram Sang Link: https://lore.kernel.org/r/20250401095847.29271-8-wsa+renesas@sang-engineering.com Signed-off-by: Ulf Hansson

mmc: rename mmc_can_sanitize() to mmc_card_can_sanitize()

2025-05-14T14:59:17+00:00

mmc_can_* functions sometimes relate to the card and sometimes to the host. Make it obvious by renaming this function to include 'card'. Also, convert to proper bool type while we are here. Signed-off-by: Wolfram Sang Link: https://lore.kernel.org/r/20250401095847.29271-7-wsa+renesas@sang-engineering.com Signed-off-by: Ulf Hansson

mmc: rename mmc_can_erase() to mmc_card_can_erase()

2025-05-14T14:59:17+00:00

mmc_can_* functions sometimes relate to the card and sometimes to the host. Make it obvious by renaming this function to include 'card'. Also, convert to proper bool type while we are here. Signed-off-by: Wolfram Sang Link: https://lore.kernel.org/r/20250401095847.29271-3-wsa+renesas@sang-engineering.com Signed-off-by: Ulf Hansson

mmc: rename mmc_can_discard() to mmc_card_can_discard()

2025-05-14T14:59:17+00:00

mmc_can_* functions sometimes relate to the card and sometimes to the host. Make it obvious by renaming this function to include 'card'. Also, convert to proper bool type while we are here. Signed-off-by: Wolfram Sang Link: https://lore.kernel.org/r/20250401095847.29271-2-wsa+renesas@sang-engineering.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: core: Allow mmc erase to carry large addresses

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

Preparing for SDUC, Allow the erase address to be larger beyond a 32 bit address. Tested-by: Ricky WU Reviewed-by: Adrian Hunter Signed-off-by: Avri Altman Link: https://lore.kernel.org/r/20241006051148.160278-6-avri.altman@wdc.com Signed-off-by: Ulf Hansson

mmc: core: refactor debugfs code

2022-12-07T12:29:13+00:00

Now, CONFIG_DEBUG_FS is scattered in various functions, to make code clean centralized processing CONFIG_DEBUG_FS in mmc debugfs module. Signed-off-by: Ye Bin Link: https://lore.kernel.org/r/20221126102520.2824574-1-yebin@huaweicloud.com Signed-off-by: Ulf Hansson