[PATCH v3 2/2] clk: mediatek: mt8183: Enable need_runtime_pm on mt8183-mfgcfg

Pin-yen Lin
2024-01-08T08:18:49Z

mt8183-mfgcfg has a mutual dependency with genpd during the probing
stage, so enable need_runtim_pm to prevent a deadlock in the following
call stack:

CPU0: genpd_lock --> clk_prepare_lock
genpd_power_off_work_fn()
genpd_lock()
generic_pm_domain::power_off()
clk_unprepare()
clk_prepare_lock()

CPU1: clk_prepare_lock --> genpd_lock
clk_register()
__clk_core_init()
clk_prepare_lock()
clk_pm_runtime_get()
genpd_lock()

Do a runtime PM get at the probe function to make sure clk_register()
won't acquire the genpd lock.

Fixes: acddfc2c261b ("clk: mediatek: Add MT8183 clock support")
Signed-off-by: Pin-yen Lin <treapking@chromium.org>
---

(no changes since v1)

drivers/clk/mediatek/clk-mt8183-mfgcfg.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/clk/mediatek/clk-mt8183-mfgcfg.c b/drivers/clk/mediatek/clk-mt8183-mfgcfg.c
index ba504e19d420..62d876e150e1 100644
--- a/drivers/clk/mediatek/clk-mt8183-mfgcfg.c
+++ b/drivers/clk/mediatek/clk-mt8183-mfgcfg.c
@@ -29,6 +29,7 @@ static const struct mtk_gate mfg_clks[] = {
static const struct mtk_clk_desc mfg_desc = {
.clks = mfg_clks,
.num_clks = ARRAY_SIZE(mfg_clks),
+ .need_runtime_pm = true,
};

static const struct of_device_id of_match_clk_mt8183_mfg[] = {
--
2.43.0.472.g3155946c3a-goog