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6b32d7474e
The system hangs when any of these clocks are turned off. With the introduction of pinctrl clock support [1], the approach taken in this clock driver for the APM clocks to rely solely on the clk_ignore_unused kernel command line option does not work anymore and the system hangs during boot. gout_apm_func is a parent clock to the clocks that are going to be handled by the pinctrl driver [2], namely gout_apm_apbif_gpio_alive_pclk and gout_apm_apbif_gpio_far_alive_pclk. It also is the parent to the clocks marked as critical in this commit here (and some others that aren't relevant for this commit)). This means that once the pinctrl driver decides to turn off clocks, the clock framework will subsequently turn off parent clocks of those pinctrl clocks if they have no (apparent) user. Since gout_apm_func is the parent, and since no drivers are hooked up to it or any of its other children, gout_apm_func will be turned off. This will cause the system to hang, as the clocks marked as critical in this commit stop having an input. We might have to add a driver for these clocks, but in the meantime let's just ensure they stay on even if siblings are turned off. For the avoidance of doubt: This commit doesn't mean that we can boot without clk_ignore_unused. Link: https://lore.kernel.org/r/20240426-samsung-pinctrl-busclock-v3-0-adb8664b8a7e@linaro.org [1] Link: https://lore.kernel.org/r/20240429-samsung-pinctrl-busclock-dts-v1-0-5e935179f3ca@linaro.org [2] Signed-off-by: André Draszik <andre.draszik@linaro.org> Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org> Link: https://lore.kernel.org/r/20240430-gs101-apm-clocks-v1-1-b2e2335e84f5@linaro.org Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@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.