The pinctrl for audio subsystem needs 'mau_epll' clock to be enabled in
order to properly access memory during GPIO setup.
After introducing runtime PM to pl330 DMA driver the 'mau_epll' was
gated, because the "amba" clock was disabled and there were no more
users of mau_epll.
This lead to system hang just before probing i2s0 because
samsung_pinmux_setup() tried to access memory from audss block which was
gated.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Tested-by: Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx>
---
arch/arm/boot/dts/exynos5420-pinctrl.dtsi | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/arm/boot/dts/exynos5420-pinctrl.dtsi b/arch/arm/boot/dts/exynos5420-pinctrl.dtsi
index ba686e40eac7..c0ca0da36ade 100644
--- a/arch/arm/boot/dts/exynos5420-pinctrl.dtsi
+++ b/arch/arm/boot/dts/exynos5420-pinctrl.dtsi
@@ -696,6 +696,9 @@
};
pinctrl@03860000 {
+ clocks = <&clock CLK_MAU_EPLL>;
+ clock-names = "block";
+
gpz: gpz {
gpio-controller;
#gpio-cells = <2>;
--
1.9.1
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