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663bfe77b6
This is meant to resolve reboot not working on this board. The problem is as follows. In order to be able to switch from HS to UHS mode the bus voltage needs to be reduced from 3.3V down to 1.8V and this is achieved by the "vqmmc-supply" regulator. The ROM bootloader is only able to manage the card in HS mode (3.3V) and the switch HS->UHS happen at boottime in the kernel. The problem appears when the reboot command is issued or watchdog expires because in this case the "vqmmc-supply" voltage is not returned back at 3.3V before rebooting the board so the ROM bootloader will be completely stuck. Therefore this commit removes all UHS modes which would cause "vqmmc-summply" to switch from 3.3V to 1.8V. In terms of performance the main drawback of this commit is limiting the SD card bus speed to HS (25 MB/s) instead of UHS DDR50 (50 MB/s). However this comes with the benefit of being able to reboot the board, so it sounds like a reasonable compromise. Reviewed-by: Jerome Brunet <jbrunet@baylibre.com> Signed-off-by: Valerio Setti <vsetti@baylibre.com> Link: https://lore.kernel.org/r/20250908-fix-reboot-v2-1-354d0e57c855@baylibre.com Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> |
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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.