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PM / devfreq: exynos: add Exynos PPMU as a soft module dependency

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Commit adf8238ef4 ("ARM: dts: exynos: move exynos-bus nodes out of soc
in Exynos4412") changed the order of the exynos-bus nodes, what results
in different probe order of the Exynos Bus devices. Although the driver
properly handles the deferred probe and all devices seems to be finally
properly registered, this change revealed some kind of a bug related to
PPMU counters registration and passive governor operation. Usually in 1
of 10 boots this results in complete board freeze during loading of the
kernel modules.

To avoid that freeze, ensure that the Exynos PPMU driver is already
loaded before the Exynos Bus driver starts probing.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Marek Szyprowski 2023-05-18 09:44:03 +02:00 committed by Chanwoo Choi
parent 4a3a2c32a5
commit ccb69e228e
1 changed files with 1 additions and 0 deletions
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drivers/devfreq/exynos-bus.c
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@ -518,6 +518,7 @@ static struct platform_driver exynos_bus_platdrv = {
};
module_platform_driver(exynos_bus_platdrv);
MODULE_SOFTDEP("pre: exynos_ppmu");
MODULE_DESCRIPTION("Generic Exynos Bus frequency driver");
MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
MODULE_LICENSE("GPL v2");