MCIMX8M-EVKB SDIO WIFI NIC issue: MMC1 Timeout waiting for hardware cmd interrupt

[chetanks]

Hi,

HW: MCIMX8M-EVKB with IMX8MQ

WIFI NIC: Qualcomm Atheros QCA9377 with SDIO support

Requirement: SDIO based WIFI NIC integration using External Micro-SD card Slot

When I use an SD memory card on the External SD slot, it is detected and I can access the memory card contents.

When I use my SDIO based WIFI NIC card and try to load the wlan driver for the NIC, I observe errors as in attached log file.

So, I wanted to understand what could be different at SDIO level between the SD memory card and SDIO WIFI NIC.

Hope I have given enough details.

Thanks in advance for any help.

[igorpadykov]

Hi chetanc10

one can try to upgrade wlan driver:

https://source.codeaurora.org/external/wlan/qcacld-2.0

and follow sect.4.13 Wi-Fi Linux Manual included in linux

Documentation

Best regards
igor

[chetanks]

Hi,

I get the MMC1 Timeout message plus SDHCI REGISTER DUMP regularly even before the driver is loaded. It can be seen in the log file - before I login as root, we see the Timeout/SDHCI-Register-dump log messages.

This timeout/Dump-registers log may be caused by something else which could have caused the driver also to fail when I tried to load.

PS: The driver is to be loaded manually and is not added to kernel to be initialised during boot-up.

[igorpadykov · Accepted solution]

suggest to check signals with oscilloscope, probably this is hardware issue.

Best regards
igor

[chetanks]

Hi,

Sorry for the delay in my response.

It was as you suggested - the SDIO connection was faulty because of the uSD adapter bridge lines.

Our WIFI NIC card is thicker than a normal SD memory card and the mechanical setup of the uSD adapter's slot is such that it shorted clock and VDD cauding SDIO communication failure.

Thanks for your support.