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    ARM: imx6: gpc: always enable PU domain if CONFIG_PM is not set · d438462c
    Lucas Stach 提交于
    If CONFIG_PM is not set the PU power domain needs to be enabled always,
    otherwise there are two failure scenarios which will hang the system if
    one of the devices in the PU domain is accessed.
    
    1. New DTs (4.1+) drop the "always-on" property from the PU regulator, so
    if it isn't properly enabled by the GPC code it will be disabled at the
    end of boot.
    
    2. If the bootloader already disabled the PU domain the GPC explicitly
    needs to enable it again, even if the kernel doesn't do any power
    management. This is a bit hypothetical, as it requires to boot a
    mainline kernel on a downstream bootloader, as no mainline bootloader
    disables the PM domains.
    
    Cc: <stable@vger.kernel.org> # 4.1
    Signed-off-by: NLucas Stach <l.stach@pengutronix.de>
    Acked-by: NPhilipp Zabel <p.zabel@pengutronix.de>
    Signed-off-by: NShawn Guo <shawn.guo@linaro.org>
    d438462c
gpc.c 11.0 KB