Issue with ATH10K driver on sunxi platform using sdio

Issue with ATH10K driver on sunxi platform using sdio

[Lukas Schmid]

Hi,

I am trying to use an QCA9377-3 based module on a custom board based 
around an Allwinner V3s SoC.

The modules are loaded correctly, the module is detected and scanning 
for networks works. However when trying to connect to a network, I get 
the following message about an unaligned scatterlist.

----------------------------------------------------------------------------------

[   52.006548] mmc1: new high speed SDIO card at address 0001
[   52.084936] ath10k_sdio mmc1:0001:1: qca9377 hw1.1 sdio target 
0x05020001 chip_id 0x00000000 sub 0000:0000
[   52.084996] ath10k_sdio mmc1:0001:1: kconfig debug 0 debugfs 0 
tracing 0 dfs 0 testmode 0
[   52.088478] ath10k_sdio mmc1:0001:1: firmware ver 
WLAN.TF.1.1.1-00061-QCATFSWPZ-1 api 5 features ignore-otp crc32 7746e551
[   52.258959] ath10k_sdio mmc1:0001:1: failed to fetch board data for 
bus=sdio,vendor=0271,device=0701,subsystem-vendor=0000,subsystem-device=0000 
from ath10k/QCA9377/hw1.0/board-2.bin
[   52.307328] ath10k_sdio mmc1:0001:1: board_file api 1 bmi_id N/A 
crc32 544289f7
[   56.217772] ath10k_sdio mmc1:0001:1: htt-ver 3.32 wmi-op 4 htt-op 3 
cal otp max-sta 32 raw 0 hwcrypto 1
[   56.217995] sunxi-mmc 1c10000.mmc: unaligned scatterlist: os 4c0 
length 11
[   56.218020] sunxi-mmc 1c10000.mmc: map DMA failed
[   56.218035] ath10k_sdio mmc1:0001:1: failed to write to address 
0x12ff5: -22
[   56.218051] ath10k_sdio mmc1:0001:1: failed to write skb to 0x12ff5 
asynchronously: -22
[   56.270321] mmc1: queuing unknown CIS tuple 0x01 [d9 01 ff] (3 bytes)
[   56.277541] mmc1: queuing unknown CIS tuple 0x1a [01 01 00 02 07] (5 
bytes)
[   56.280698] mmc1: queuing unknown CIS tuple 0x1b [c1 41 30 30 ff ff 
32 00] (8 bytes)
[   56.281344] mmc1: queuing unknown CIS tuple 0x14 [] (0 bytes)
[   56.282522] ath: EEPROM regdomain: 0x0
[   56.282542] ath: EEPROM indicates default country code should be used
[   56.282550] ath: doing EEPROM country->regdmn map search
[   56.282559] ath: country maps to regdmn code: 0x3a
[   56.282568] ath: Country alpha2 being used: US
[   56.282576] ath: Regpair used: 0x3a
[   60.308005] sunxi-mmc 1c10000.mmc: unaligned scatterlist: os b80 
length 11
[   60.308061] sunxi-mmc 1c10000.mmc: map DMA failed
[   60.308078] ath10k_sdio mmc1:0001:1: failed to write to address 
0x12ff5: -22
[   60.308096] ath10k_sdio mmc1:0001:1: failed to write skb to 0x12ff5 
asynchronously: -22

----------------------------------------------------------------------------------

Has anyone maybe got an idea as to how this could be fixed?

The kernel running on the board is Linux Mainline 6.8.2

Best regards,
Lukas Schmid

Re: Issue with ATH10K driver on sunxi platform using sdio

[Felix Kaechele]

Hi Lukas,

On 2024-04-11 16:17, Lukas Schmid wrote:

> The modules are loaded correctly, the module is detected and scanning 
> for networks works. However when trying to connect to a network, I get 
> the following message about an unaligned scatterlist.
> 
> ----------------------------------------------------------------------------------
> 
[...]
> [   56.217995] sunxi-mmc 1c10000.mmc: unaligned scatterlist: os 4c0 
> length 11
> [   56.218020] sunxi-mmc 1c10000.mmc: map DMA failed
[...]
> 
> ----------------------------------------------------------------------------------
> 
> Has anyone maybe got an idea as to how this could be fixed?

sunxi-mmc could implement a bounce buffer to gracefully handle these 
unaligned DMA operations. This is what other architectures do.

Here's an example from STM32: 
https://patches.linaro.org/project/linux-mmc/patch/20220328145114.334577-1-yann.gautier@foss.st.com/

Regards,
Felix