Hi.
I'm using max3421-hcd on max3421evkit-1+ connected to SPI of Wandboard
(i.MX6Quad) and running kernel 4.11-rc6 (from trunk of linux-stable).
The SPI is running at 25MHz (the maximum for max3421e chip).
The performance I'm observing is very low. Transfer speed to/from a USB
flash stick is as low as 70KB/sec.
There are no errors in dmesg. The max3421e datasheet claims that the
chip is capable of Full Speed USB, and 25MHz SPI clock should be
sufficient for that.
Do you have any ideas why it may be performing that poorly for me or how
could I debug that?
Thank you.
Alexander.
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