On Thu, Jun 30, 2016 at 05:32:08PM +0200, Thierry Reding wrote: > From: Lucas Stach <dev@xxxxxxxxxx> > > This allows to switch the card signal voltage level to 1.8 V, which is > needed for any ultra high speed modes to work. > > Signed-off-by: Lucas Stach <dev@xxxxxxxxxx> > Acked-by: Jon Hunter <jonathanh@xxxxxxxxxx> > Signed-off-by: Thierry Reding <treding@xxxxxxxxxx> > --- > Hi ARM-SoC maintainers, > > Can you please apply this for v4.7? It fixes a regression with UHS modes > that I had hoped could be fixed in the MMC core, but it turns out that a > fairly invasive change will be required and it's not going to make v4.7. > > I should note that this is not a workaround. It is the proper fix to > enable UHS modes, but it exposes a weakness in the SDHCI driver which > will happily switch to UHS modes whether or not the power supply can be > configured to output the required voltage. Ideally the SDHCI driver will > be taught to reject UHS modes if the available supply voltages aren't > suitable. There is work underway to do that, but it won't make v4.7. Applied to fixes. -Olof -- 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
