> > +	/* Tuning done, no special handling for SCC clock needed anymore */
> > +	priv->keep_scc_freq = false;
> > +
> 
> Setting keep_scc_freq to false is only here. But, I'm thinking
> we should set it in some error paths like below somehow too:
>  - error paths before hs400_complete() in mmc_select_hs400().
>  - error path of mmc_execute_tuning() in mmc_retune().

Hmm, I guess you are right. That would kind of spoil my approach taken
here. Maybe we need another flag in the core like 'doing_tune' to
supplement 'doing_retune', so or driver knows when any kind of tuning is
going on?