[v2,0/2] Fixes for hang on MT8195-Tomato during mediatek-cpufreq-hw init

Message

Nícolas F. R. A. Prado Jan. 10, 2024, 2:23 p.m. UTC

These two patches fix 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.

Changes in v2:
- Moved supply phandles to CPU nodes in DT
- Added fixes tags
- Added patch to verify CPU supplies are available before proceeding in
  the mediatek-cpufreq-hw driver

Nícolas F. R. A. Prado (2):
  arm64: dts: mediatek: cherry: Describe CPU supplies
  cpufreq: mediatek-hw: Wait for CPU supplies before probing

 .../boot/dts/mediatek/mt8195-cherry.dtsi      | 32 +++++++++++++++++++
 drivers/cpufreq/mediatek-cpufreq-hw.c         | 19 ++++++++++-
 2 files changed, 50 insertions(+), 1 deletion(-)