[OpenWrt-Devel] Broken SPI transfers on TD-W8970 (latest trunk)

[Martin Blumenstingl]

Hi John,

I am getting SPI errors on latest trunk.
It seems that those might be related to your SPI changes from last week.

I found that someone else reported a similar issue a few years ago: [0].
That patch was never applied and I'm not sure if it's 100% correct.

These are the errors I get without the rxreq_max correction
(hw->rxfs -1) applied - the device is barely usable in this case:
[  106.211973] spi-xway 1e100800.spi: SPI wait ready timed out stat: 44002003
[  106.217446] m25p80 spi32766.3: wait failed
[  106.419959] spi-xway 1e100800.spi: SPI wait ready timed out stat: 44002003
[  106.623973] spi-xway 1e100800.spi: SPI wait ready timed out stat: c4002003
[  106.629442] m25p80 spi32766.3: wait failed
[  106.831959] spi-xway 1e100800.spi: SPI wait ready timed out stat: c4002003
[  107.035969] spi-xway 1e100800.spi: SPI wait ready timed out stat: c4002003
[  107.041432] m25p80 spi32766.3: wait failed
[  107.243966] spi-xway 1e100800.spi: SPI wait ready timed out stat: c4002003
[  107.447973] spi-xway 1e100800.spi: SPI wait ready timed out stat: c4002003

However, with the rxreq_max correction applied it works better, but I
get read errors sometimes:
[   18.798861] spi-xway 1e100800.spi: error 441e2203
[   18.802207] spi_master spi32766: failed to transfer one message from queue
[   18.810784] spi-xway 1e100800.spi: error 44162203
[   18.814123] spi_master spi32766: failed to transfer one message from queue
or:
# passwd
[  123.844172] spi-xway 1e100800.spi: error b4092203
[  123.847459] spi_master spi32766: failed to transfer one message from queue
passwd: no record of root in /etc/shadow, using /etc/passwd: I/O error

I've attached two patches where the second one should help debugging
this (or further) issues, and the other one might actually fix an actual
on some devices.

Are you able to reproduce these issues on your TD-W89x0 as well?

Regards,
Martin


[0] https://lists.openwrt.org/pipermail/openwrt-devel/2012-April/014794.html
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