kernel/linux.git/drivers/mmc/core/core.c, branch v6.18.21

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: Remove redundant pm_runtime_mark_last_busy() calls

2025-07-09T13:54:06+00:00

pm_runtime_put_autosuspend(), pm_runtime_put_sync_autosuspend(), pm_runtime_autosuspend() and pm_request_autosuspend() now include a call to pm_runtime_mark_last_busy(). Remove the now-reduntant explicit call to pm_runtime_mark_last_busy(). Signed-off-by: Sakari Ailus Link: https://lore.kernel.org/r/20250704075434.3220506-1-sakari.ailus@linux.intel.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: Remove redundant null check

2025-03-21T08:48:37+00:00

This change removes a redundant null check found by Smatch. Fixes: 403a0293f1c2 ("mmc: core: Add open-ended Ext memory addressing") Reported-by: Dan Carpenter Closes: https://lore.kernel.org/linux-mmc/345be6cd-f2f3-472e-a897-ca4b7c4cf826@stanley.mountain/ Signed-off-by: Avri Altman Link: https://lore.kernel.org/r/20250319203642.778016-1-avri.altman@sandisk.com Signed-off-by: Ulf Hansson

mmc: core: don't include 'pm_wakeup.h' directly

2024-12-10T10:18:45+00:00

The header clearly states that it does not want to be included directly, only via 'device.h'. 'platform_device.h' works equally well. Remove the direct inclusion. Signed-off-by: Wolfram Sang Message-ID: <20241118072917.3853-9-wsa+renesas@sang-engineering.com> Signed-off-by: Ulf Hansson