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533c62f5c1
Add infrastructure to handle regulator undervoltage events for MMC/eMMC cards. When an undervoltage is detected, the new handler performs a controlled emergency suspend using a short power-off notification, skipping the cache flush to maximize the chance of a safe shutdown. After the operation, the card is marked as removed to prevent further I/O and possible data corruption. This is implemented by introducing MMC_POWEROFF_UNDERVOLTAGE to the mmc_poweroff_type enum and refactoring the suspend logic into an internal __mmc_suspend() helper that allows the caller to skip the cache flush if required. The undervoltage handler is registered as a bus operation and invoked from the core undervoltage path. If power-off notification is not supported by the card, the handler falls back to sleep or deselecting the card. Additionally, update the shutdown path to avoid redundant shutdown steps if the card is already removed Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Link: https://lore.kernel.org/r/20250821130751.2089587-3-o.rempel@pengutronix.de Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.