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In case the UART port is used as a console, no_console_suspend is available in bootargs and UART port is part of a software-controlled power domain we need to call device_set_awake_path(). This lets the power domain core code know that this domain should not be powered off during system suspend. Otherwise, the UART port power domain is turned off, nothing is printed while suspending and the suspend/resume process is blocked. This was detected on the Renesas RZ/G3S SoC while adding support for power domains. Based on code investigation (on v6.9-rc5), this issue is present on other SoCs (e.g., Renesas R-Mobile A1 [1], IMX8QXP [2]) and different SoCs have particular implementation to handle it. Due to this the patch added the call of device_set_awake_path() in uart_suspend_port() instead of having it in the platform specific UART driver. [1] drivers/pmdomain/renesas/rmobile-sysc.c:116 [2] drivers/pmdomain/imx/scu-pd.c:357 Suggested-by: Ulf Hansson <ulf.hansson@linaro.org> Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Tony Lindgren <tony.lindgren@linux.intel.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com> Link: https://lore.kernel.org/r/20240430095930.2806067-1-claudiu.beznea.uj@bp.renesas.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.