Hi Jerome, On Tue, Apr 23, 2019 at 11:03 AM Jerome Brunet <jbrunet@xxxxxxxxxxxx> wrote: > > At the moment, all our attempts to enable HS400 on Amlogic chipsets have > been unsuccessful or unreliable. Until we can figure out how to enable this > mode safely and reliably, let's force it off. last year I have seen issues with HS400 on my Khadas VIM2: [0] have you tested all other patches from this series and HS400 is still not working for you? I'm curious because this patch is early in the series and all the tuning fixes and improvements are after this patch. Martin [0] http://lists.infradead.org/pipermail/linux-amlogic/2018-January/006251.html