On Wed, Jan 6, 2021 at 11:06 PM Andre Przywara [off-list ref] wrote:

The H6 manual explicitly lists a frequency limit of 150 MHz for the bus
frequency of the MMC controllers. So far we had no explicit limits in the
DT, which limited eMMC to a rather conservative 52 MHz.

I'd say this is implementation specific. FreeBSD might have other defaults?

Put those maximum frequencies in the SoC .dtsi, to allow higher speed
modes (which still would need to be explicitly enabled, per board).

Tested with an eMMC using HS-200 on a Pine H64. Running at the spec'ed
200 MHz indeed fails with I/O errors, but 150 MHz seems to work stably.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>

Fixes tag?


Thanks
ChenYu