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a69d5795f1
Certain registers in the AFE IO space require the apll1 clock to be
enabled in order to be read, otherwise the machine hangs (registers like
0x280, 0x410 (AFE_GAIN1_CON0) and 0x830 (AFE_CONN0_5)). During AFE
driver probe, when initializing the regmap for the AFE IO space those
registers are read, resulting in a hang during boot.
This has been observed on the Genio 700 EVK, Genio 510 EVK and
MT8188-Geralt-Ciri Chromebook, all of which are based on the MT8188 SoC.
Assign CLK_TOP_APLL1_D4 as the parent for CLK_TOP_A1SYS_HP, which is
enabled during register read and write, to make sure the apll1 is
enabled during register operations and prevent the MT8188 machines from
hanging during boot.
Cc: stable@vger.kernel.org
Fixes: bd568ce198 ("arm64: dts: mediatek: mt8188: Add audio support")
Suggested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Link: https://lore.kernel.org/r/20250207-mt8188-afe-fix-hang-disabled-apll1-clk-v2-1-a636d844c272@collabora.com
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
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
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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.