[PATCH v2 2/2] cpufreq: mediatek-hw: Wait for CPU supplies before probing

[AngeloGioacchino Del Regno]

Il 10/01/24 15:23, Nícolas F. R. A. Prado ha scritto:
> Before proceeding with the probe and enabling frequency scaling for the
> CPUs, make sure that all supplies feeding the CPUs have probed.
> 
> This fixes an issue observed on MT8195-Tomato where if the
> mediatek-cpufreq-hw driver enabled the hardware (by writing to
> REG_FREQ_ENABLE) before the SPMI controller driver (spmi-mtk-pmif),
> behind which lies the big CPU supply, probed the platform would hang
> shortly after with "rcu: INFO: rcu_preempt detected stalls on
> CPUs/tasks" being printed in the log.
> 
> Fixes: 4855e26bcf4d ("cpufreq: mediatek-hw: Add support for CPUFREQ HW")
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado at collabora.com>
> 

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>