Re: [PATCH] spi: imx: Revert "spi: imx: enable runtime pm support"

[Christian Eggers <ceggers@xxxxxxx>]

Hi Sascha,

On Friday, 9 October 2020, 09:39:44 CEST, Sascha Hauer wrote:
> On Fri, Oct 09, 2020 at 06:27:38AM +0200, Christian Eggers wrote:
> > This reverts commit 525c9e5a32bd7951eae3f06d9d077fea51718a6c.
> > 
> > If CONFIG_PM is disabled, the system completely freezes on probe as
> > nothing enables the clock of the SPI peripheral.
> 
> Instead of reverting it, why not just fix it?
I expect that 5.9 will be released soon. I think that in this late stage 
reverting is more safe than fixing...

> Normally the device should be brought to active state manually in probe
> before pm_runtime takes over, then CONFIG_PM disabled doesn't hurt.
> Using pm_runtime to put the device to active state initially has the
> problem you describe.
Thanks for the hint. I've no experience in runtime power management. If you 
could provide a patch against the current version, I can make a quick test. I 
can also try to fix it myself, but this will take until next week.

Best regards
Christian