Re: sdhci-omap: issues with PM features since 5.16

[Tony Lindgren <tony@atomide.com>]

Hi,

* Romain Naour <romain.naour@smile.fr> [240126 20:53]:
> Hello,
> 
> I'm upgrading the kernel from 5.10.168 to 6.1.69 (both from TI tree) on a custom
> board based on a AM574x SoC and I noticed a regression on the sdhci-omap driver.
> 
> The emmc was working on the 5.10 kernel using mmc-hs200 powered at 1,8v (mmc2).

Is this limited to emmc or does it also happen with the micro-sd or wlan possibly?

If the issue is emmc related, do you have mmc-pwrseq-emmc configured in the dts?

> I'm able to reproduce on the IDK574x evaluation board (where the emmc is powered
> at 3v3) with vanilla kernels.

OK, looks like only am5729-beagleboneai.dts has configured mmc-pwrseq-emmc.

> I had to revert all commits related to "PM runtime functions" [1] and "card
> power off and enable aggressive PM" [2] from kernel 5.16 to use the emmc again
> on both boards.

OK, this sounds like power sequence related when the emmc gets idled.

Regards,

Tony

> [1]
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=f433e8aac6b94218394c6e7b80bb89e4e79c9549
> [2]
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=3edf588e7fe00e90d1dc7fb9e599861b2c2cf442