Re: kern/60311: eMMC not powering up (used to work)

[Jared McNeill <jmcneill%invisible.ca@localhost>]

On Fri, 5 Jun 2026, Martin Husemann via gnats wrote:

> Fix suggested by mlelstv. This also affects netbsd-10 and netbsd-11.
>
> When we see an error from the host controller, delay the soft reset by 100us.
>
> Index: sys/dev/sdmmc/sdhc.c
> ===================================================================
> RCS file: /cvsroot/src/sys/dev/sdmmc/sdhc.c,v
> retrieving revision 1.125
> diff -u -p -r1.125 sdhc.c
> --- sys/dev/sdmmc/sdhc.c	9 Jan 2026 22:54:34 -0000	1.125
> +++ sys/dev/sdmmc/sdhc.c	5 Jun 2026 20:37:48 -0000
> @@ -2356,8 +2356,10 @@ sdhc_wait_intr(struct sdhc_host *hp, int
>
>  	if (nointr ||
>  	    (ISSET(status, SDHC_ERROR_INTERRUPT) && error)) {
> -		if (!ISSET(hp->sc->sc_flags, SDHC_FLAG_ENHANCED))
> +		if (!ISSET(hp->sc->sc_flags, SDHC_FLAG_ENHANCED)) {
> +			sdmmc_delay(100);
>  			(void)sdhc_soft_reset(hp, SDHC_RESET_CMD|SDHC_RESET_DAT);
> +		}
>  		hp->intr_error_status = 0;
>  		status = 0;
>  	}
>
> Without this second part I get random failures (differing between cold
> boot and also changing after soft reboot). The most populare failures is
> "unknown MMC version 6".

The patch looks fine, but RK356x doesn't set SDHC_FLAG_ENHANCED, so I'm 
struggling to see how this changes anything for you?

When SDHC_FLAG_ENHANCED is NOT set, both with and without this patch, the 
delay and sdhc_soft_reset lines will be executed. What am I missing?