Mikhail Kshevetskiy a626b7e74d airoha: spi: use airoha snfi driver for EN7523 ...

There are two spi drivers for en7523/an7581/an7583:
 * en7581-snand (spi-airoha-snfi.c)
 * en7523-spi (spi-en7523.c)
The first one supports DMA, but until recently it has several nasty
issues. The second do things properly but does not support DMA.
Recently the first driver was greatly improved, so there is no sence
keep both drivers anymore.

This patch removes en7523-spi driver and use DMA capable driver instead.
Unfortunately there is a nasty en7523 specific issue.

We found that some serial console may pull TX line to GROUND during board
boot time. Airoha uses TX line as one of it's BOOT pins. This will lead
to booting in RESERVED boot mode. It was found that some flashes operates
incorrectly in RESERVED mode if DMA used.

This patch also adds a hack that turns off DMA and prints big fat warning
if booting in reserved mode was detected. This slow down flash operations
but does not kill your data.

Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu>
Link: https://github.com/openwrt/openwrt/pull/20365
Signed-off-by: Robert Marko <robimarko@gmail.com>

2025-10-10 10:30:10 +02:00

3.3 KiB

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