Am Freitag, den 13.05.2016, 19:27 +0200 schrieb Thierry Reding: > On Fri, May 13, 2016 at 09:25:31AM +0200, Lucas Stach wrote: > > > > Am Montag, den 29.02.2016, 22:01 +0100 schrieb Lucas Stach: > > > > > > This allows to switch the card signal voltage level to 1.8V, > > > which is needed for any ultra high speed modes to work. > > > > > > Signed-off-by: Lucas Stach <dev@xxxxxxxxxx> > > > --- > > > This needs the SDMMC memcomp pad calibration patches I just > > > sent out to be applied, otherwise the card voltage change will > > > fail with a message in the kernel log and a fall back to > > > high speed operation. > > The patches this one depends on have been applied for some time > > now. > > Please pick up this patch. > My understanding is that UHS modes currently cause problems on > Beaver. > What I don't understand about that is how it will even try those > modes > if the voltage regulator can't be set to 1.8 V? Shouldn't that > actively > prevent those modes from even being attempted? > AFAIK this is right. I haven't re-tested with v4.6 yet, but on v4.5 without this change the high-speed modes using 1.8V signaling would not be used on the SD card. As eMMC doesn't need the voltage switch, this one will work in high-speed mode on Beaver. Regards, Lucas -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
