Re: [PATCH V3 1/5] thermal: qoriq: Add clock operations

From: Leonard Crestez
Date: Tue Aug 27 2019 - 08:41:47 EST

On 27.08.2019 04:51, Anson Huang wrote:
>> In an earlier series the CLK_IS_CRITICAL flags was removed from the TMU
>> clock so if the thermal driver doesn't explicitly enable it the system will hang
>> on probe. This is what happens in linux-next right now!
> The thermal driver should be built with module, so default kernel should can boot
> up, do you modify the thermal driver as built-in?
>> Unless this patches is merged soon we'll end up with a 5.4-rc1 that doesn't
>> boot on imx8mq. An easy fix would be to drop/revert commit
>> 951c1aef9691 ("clk: imx8mq: Remove CLK_IS_CRITICAL flag for
>> IMX8MQ_CLK_TMU_ROOT") until the thermal patches are accepted.
> If the thermal driver is built as module, I think no need to revert the commit, but
> if by default thermal driver is built-in or mod probed, then yes, it should NOT break
> kernel boot up.

The qoriq_thermal driver is built as a module in defconfig and when
modules are properly installed in rootfs they will be automatically be
probed on boot and cause a hang.

I usually run nfsroot with modules:

make modules_install INSTALL_MOD_PATH=/srv/nfs/imx8-root