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Also do a runtime PM get on the clock controller during the probing stage to workaround a possible deadlock. Signed-off-by: Pin-yen Lin Reviewed-by: Chen-Yu Tsai --- Changes in v3: - Update the commit message and the comments before runtime PM call Changes in v2: - Fix the order of error handling - Update the commit message and add a comment before the runtime PM call drivers/clk/mediatek/clk-mtk.c | 19 +++++++++++++++++++ drivers/clk/mediatek/clk-mtk.h | 2 ++ 2 files changed, 21 insertions(+) diff --git a/drivers/clk/mediatek/clk-mtk.c b/drivers/clk/mediatek/clk-mtk.c index 2e55368dc4d8..ba1d1c495bc2 100644 --- a/drivers/clk/mediatek/clk-mtk.c +++ b/drivers/clk/mediatek/clk-mtk.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include "clk-mtk.h" @@ -494,6 +495,18 @@ static int __mtk_clk_simple_probe(struct platform_device *pdev, return IS_ERR(base) ? PTR_ERR(base) : -ENOMEM; } + + if (mcd->need_runtime_pm) { + 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; @@ -574,6 +587,9 @@ static int __mtk_clk_simple_probe(struct platform_device *pdev, goto unregister_clks; } + if (mcd->need_runtime_pm) + pm_runtime_put(&pdev->dev); + return r; unregister_clks: @@ -604,6 +620,9 @@ static int __mtk_clk_simple_probe(struct platform_device *pdev, free_base: if (mcd->shared_io && base) iounmap(base); + + if (mcd->need_runtime_pm) + pm_runtime_put(&pdev->dev); return r; } diff --git a/drivers/clk/mediatek/clk-mtk.h b/drivers/clk/mediatek/clk-mtk.h index 22096501a60a..c17fe1c2d732 100644 --- a/drivers/clk/mediatek/clk-mtk.h +++ b/drivers/clk/mediatek/clk-mtk.h @@ -237,6 +237,8 @@ struct mtk_clk_desc { int (*clk_notifier_func)(struct device *dev, struct clk *clk); unsigned int mfg_clk_idx; + + bool need_runtime_pm; }; int mtk_clk_pdev_probe(struct platform_device *pdev);