diff options
| author | Pin-yen Lin <treapking@chromium.org> | 2024-03-12 14:51:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-04-27 18:07:13 +0300 |
| commit | 165d226472575b213dd90dfda19d1605dd7c19a8 (patch) | |
| tree | 1d3cd2f06961e27f6b0539f85e7b39ef42c92b00 /drivers/clk | |
| parent | c1d87d56af063c87961511ee25f6b07a5676d27d (diff) | |
| download | linux-165d226472575b213dd90dfda19d1605dd7c19a8.tar.xz | |
clk: mediatek: Do a runtime PM get on controllers during probe
[ Upstream commit 2f7b1d8b5505efb0057cd1ab85fca206063ea4c3 ]
mt8183-mfgcfg has a mutual dependency with genpd during the probing
stage, which leads to 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. Instead of only modifying mt8183-mfgcfg,
do this on all mediatek clock controller probings because we don't
believe this would cause any regression.
Verified on MT8183 and MT8192 Chromebooks.
Fixes: acddfc2c261b ("clk: mediatek: Add MT8183 clock support")
Signed-off-by: Pin-yen Lin <treapking@chromium.org>
Link: https://lore.kernel.org/r/20240312115249.3341654-1-treapking@chromium.org
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/clk')
| -rw-r--r-- | drivers/clk/mediatek/clk-mtk.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/clk/mediatek/clk-mtk.c b/drivers/clk/mediatek/clk-mtk.c index bfabd94a474a..fa2c1b1c7dee 100644 --- a/drivers/clk/mediatek/clk-mtk.c +++ b/drivers/clk/mediatek/clk-mtk.c @@ -14,6 +14,7 @@ #include <linux/of_address.h> #include <linux/of_device.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/slab.h> #include "clk-mtk.h" @@ -470,6 +471,16 @@ int mtk_clk_simple_probe(struct platform_device *pdev) return IS_ERR(base) ? PTR_ERR(base) : -ENOMEM; } + + devm_pm_runtime_enable(&pdev->dev); + /* + * Do a pm_runtime_resume_and_get() to workaround a possible + * deadlock between clk_register() and the genpd framework. + */ + r = pm_runtime_resume_and_get(&pdev->dev); + if (r) + return r; + /* Calculate how many clk_hw_onecell_data entries to allocate */ num_clks = mcd->num_clks + mcd->num_composite_clks; num_clks += mcd->num_fixed_clks + mcd->num_factor_clks; @@ -531,6 +542,8 @@ int mtk_clk_simple_probe(struct platform_device *pdev) goto unregister_clks; } + pm_runtime_put(&pdev->dev); + return r; unregister_clks: @@ -556,6 +569,8 @@ free_data: mtk_free_clk_data(clk_data); if (mcd->shared_io && base) iounmap(base); + + pm_runtime_put(&pdev->dev); return r; } EXPORT_SYMBOL_GPL(mtk_clk_simple_probe); |