Hi, On Sat, Jan 28, 2017 at 08:44:02PM +0800, Chen-Yu Tsai wrote: > On Sat, Jan 28, 2017 at 5:38 AM, Maxime Ripard > <maxime.ripard@xxxxxxxxxxxxxxxxxx> wrote: > > Hi, > > > > Here is a new attempt at getting the MMC controllers running, following the > > work done by Andre. > > > > This has been tested on a board with one SDIO device (a Marvell WiFi chip) > > and a Kingston eMMC with 1.8V IOs. > > > > For SDIO, the HS DDR mode works just fine. That serie also enables the > > SDR104 mode to work on the devices that are capable of this. > > > > For the eMMC, HS200 with the voltage switch works. HS400 doesn't at the > > moment, but since it's significantly more complex, and at the same time > > Allwinner recommends to limit its frequency to 100MHz, this doesn't have > > any benefits. If there's any at some point, this can be added later. > > Whole series is > > Acked-by: Chen-Yu Tsai <wens@xxxxxxxx> > > Seems that we don't need to increase the signal drive strength for eMMC > on the A64? This is probably a good thing. From what I've seen, Allwinner still recommends using a 30mA drive strength, so that doesn't seem needed. Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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