clk: mediatek: Do a runtime PM get on controllers during probe

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 <[e-mail]>

Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: AngeloGioacchino Del Regno <[e-mail]>
Tested-by: AngeloGioacchino Del Regno <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/mediatek/clk-mtk.c

···
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/slab.h>
 
 #include "clk-mtk.h"
···
 			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;
···
 			goto unregister_clks;
 	}
 
+	pm_runtime_put(&pdev->dev);
+
 	return r;
 
 unregister_clks:
···
 free_base:
 	if (mcd->shared_io && base)
 		iounmap(base);
+
+	pm_runtime_put(&pdev->dev);
 	return r;
 }