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[PATCH] soc: Mediatek: Enable SCPSYS power domain driver by default

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  [PATCH] soc: Mediatek: Enable SCPSYS power domain driver by default Eddie Huang <eddie.huang@mediatek.com> - 2015-11-13 12:00 +0100
    Re: [PATCH] soc: Mediatek: Enable SCPSYS power domain driver by default Kevin Hilman <khilman@kernel.org> - 2015-11-13 17:00 +0100

#1268871 — [PATCH] soc: Mediatek: Enable SCPSYS power domain driver by default

If enable Mediatek 8173 SoC, it should also enable power domain
driver. Otherwise access clk subsystem register will fail.

Signed-off-by: Eddie Huang <eddie.huang@mediatek.com>

---
MT8173 clk driver is enabled by default, but power domain driver
is not. If MM subsystem power on, mm_sel topckgen mux is off,
then access any MM subsystem register will cause system hang. Enable
SCPSYS driver to make sure both MM subsystem power and mm_sel to
on/off together to avoid system hang.

This patch fix current linux-next mt8173-evb boot to shell fail
problem.
---
 drivers/soc/mediatek/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/soc/mediatek/Kconfig b/drivers/soc/mediatek/Kconfig
index 9d50682..0a4ea80 100644
--- a/drivers/soc/mediatek/Kconfig
+++ b/drivers/soc/mediatek/Kconfig
@@ -23,6 +23,7 @@ config MTK_PMIC_WRAP
 config MTK_SCPSYS
 	bool "MediaTek SCPSYS Support"
 	depends on ARCH_MEDIATEK || COMPILE_TEST
+	default ARM64 && ARCH_MEDIATEK
 	select REGMAP
 	select MTK_INFRACFG
 	select PM_GENERIC_DOMAINS if PM
-- 
1.9.1

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#1269041

Eddie Huang <eddie.huang@mediatek.com> writes:

> If enable Mediatek 8173 SoC, it should also enable power domain
> driver. Otherwise access clk subsystem register will fail.
>
> Signed-off-by: Eddie Huang <eddie.huang@mediatek.com>

Tested-by: Kevin Hilman <khilman@linaro.org>

This gets the mt8173-evb booting again with arm-soc/for-next and
mainline for me.

I'll let Matthias queue this up and send it with any other fixes for
v4.4-rc1.

Thanks for the fix,

Kevin

P.S. it's curious that nobody caught this basic boot failure before.  Is
nobody else testing mainline on this board?  or maybe not using the
upstream defconfig?

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