wilc1000: Make SPI transfers work at 48MHz

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For CMD_SINGLE_READ and CMD_INTERNAL_READ, WILC may insert one or more
zero bytes between the command response and the DATA Start tag (0xf3).
This behavior appears to be undocumented in "ATWILC1000 USER GUIDE"
(https://tinyurl.com/4hhshdts) but we have observed 1-4 zero bytes
when the SPI bus operates at 48MHz and none when it operates at 1MHz.

This code is derived from the equivalent code of the wilc driver in
the linux-at91 repository.

Signed-off-by: David Mosberger-Tang <davidm@egauge.net>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210227172818.1711071-1-davidm@egauge.net

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David Mosberger-Tang 2021-02-27 17:29:14 +00:00 • committed by Kalle Valo

parent d23a962203

commit f2131fa516

1 changed files with 29 additions and 13 deletions

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drivers/net/wireless/microchip/wilc1000/spi.c

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