kernel/linux.git/drivers/mmc/core/host.c, branch linux-7.1.y

mmc: core: Switch to use pm_ptr() for mmc_host_class_dev_pm_ops

2026-03-27T09:25:16+00:00

Currently, the mmc_host_class_dev_pm_ops and its callback functions are wrapped in #ifdef CONFIG_PM_SLEEP to handle the conditional compilation when PM support is disabled. Replace this #ifdef usage with the standard pm_ptr() helpers. This allows the compiler to automatically optimize away the unused code paths when CONFIG_PM_SLEEP is not selected, resulting in cleaner and more maintainable code. Signed-off-by: Shawn Lin Signed-off-by: Ulf Hansson

mmc: core: Remove legacy 'enable-sdio-wakeup' DT property support

2026-03-27T09:24:51+00:00

The 'enable-sdio-wakeup' device tree property was marked as legacy and superseded by the standard 'wakeup-source' property in commit 71a0151c5c82 ("Documentation: devicetree: fix reference to legacy wakeup properties") back in 2015. Since it has been a decade and the migration to the standard property has long been completed, remove this obsolete legacy support. Signed-off-by: Shawn Lin Signed-off-by: Ulf Hansson

mmc: core: Validate UHS/DDR/HS200 timing selection for 1-bit bus width

2026-03-16T14:46:58+00:00

UHS/DDR/HS200 modes require at least 4-bit bus support. Host controllers that lack relevant capability registers rely on paring properties provided by firmware, which may incorrectly set these modes. Now that mmc_validate_host_caps() has been introduced to validate such configuration violations, let's also add checks for UHS/DDR/HS200 modes. This fixes an issue where, if the HS200/HS400 property is set while only a 1-bit bus width is used, mmc_select_hs200() returns 0 without actually performing the mode switch. Consequently, mmc_select_timing() proceeds without falling back to mmc_select_hs(), leaving the eMMC device operating in legacy mode (26 MHz) instead of switching to High Speed mode (52 MHz). Signed-off-by: Luke Wang [Shawn: reword the commit msg and rework the code] Signed-off-by: Shawn Lin Signed-off-by: Ulf Hansson

mmc: core: Parse and use the new max-sd-hs-hz DT property

2025-09-12T12:49:36+00:00

Introduce a new device tree flag to cap the maximum High-Speed (HS) mode frequency for SD cards, accommodating board-specific electrical limitations which cannot support the default 50Mhz HS frequency and others. Signed-off-by: Sarthak Garg Signed-off-by: Ulf Hansson

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

treewide, timers: Rename from_timer() to timer_container_of()

2025-06-08T07:07:37+00:00

Move this API to the canonical timer_*() namespace. [ tglx: Redone against pre rc1 ] Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/all/aB2X0jCKQO56WdMt@gmail.com

treewide: Switch/rename to timer_delete[_sync]()

2025-04-05T08:30:12+00:00

timer_delete[_sync]() replaces del_timer[_sync](). Convert the whole tree over and remove the historical wrapper inlines. Conversion was done with coccinelle plus manual fixups where necessary. Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar

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

mmc: core: Remove unused of_gpio.h

2024-04-02T10:21:38+00:00

of_gpio.h is deprecated and subject to remove. The driver doesn't use it, simply remove the unused header. Signed-off-by: Andy Shevchenko Link: https://lore.kernel.org/r/20240307114600.3643948-1-andriy.shevchenko@linux.intel.com Signed-off-by: Ulf Hansson

mmc: core: make mmc_host_class constant

2024-03-06T22:36:29+00:00

Since commit 43a7206b0963 ("driver core: class: make class_register() take a const *"), the driver core allows for struct class to be in read-only memory, so move the mmc_host_class structure to be declared at build time placing it into read-only memory, instead of having to be dynamically allocated at boot time. Cc: Greg Kroah-Hartman Suggested-by: Greg Kroah-Hartman Signed-off-by: Ricardo B. Marliere Link: https://lore.kernel.org/r/20240305-class_cleanup-mmc-v1-1-4a66e7122ff3@marliere.net Signed-off-by: Ulf Hansson