SabreBoard imx7 and pciExpress WLAN Chip ath9k

[rubenschwarz]

Hi,

I'm trying to get an Atheros WLAN Chip running on imx7 Sabre board. Chipset is ath9k.

Kernel and root-file system are built by yocto, System startup works fine and wpa_supplicant tries to connect to WLAN.

After getting a WLAN-Connection, this connection is immediatelly disconnected.

After some research i found, that ping is very slow (500-1500ms) and not stable. Furthermore I found, that there are no interrupts for ath9k driver:

cat /proc/interrupts:

CPU0 CPU1
305: 0 0 GPCV2 122 Edge PCIe PME, ath9k

On a second board with imx6 with working wlan there are interrupts.

Now my question:

How can I enable interrupts for ath9k driver?

Is this an devicetree configuration problem?

Any configuration options for ath9k kernel driver?

Any other ideas?

Thanks in advance

Ruben

[igorpadykov]

Hi Ruben

what bsp used in the case, please note that i.MX7 supported starting

only from L4.1.15_1.2.0. Regarding interrupts, these are enabled in dts ("msi") :

linux-2.6-imx.git - Freescale i.MX Linux Tree 

so this may be wlan chip firmware issue and one can apply to atheros support

for updated firmware.

Best regards
igor
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[rubenschwarz]

Hi Igor,

thanks for your response.

I am already using bsp version L4.1.15_1.2.0 , see following snippet from

yocto kernel recipe:

SRCREV = "rel_imx_4.1.15_1.2.0_ga"

SRCBRANCH = "imx_4.1.15_1.0.0_ga"

SRC_URI = "\

git://git.freescale.com/imx/linux-2.6-imx.git?branch=$\

file://defconfig \

"

Do you have any ideas how to check the interrupt configuration against a

datasheet?

If I do "cat /proc/interrupts" on imx7 board, i see the following:

cat /proc/interrupts:

CPU0 CPU1

305: 0 0 GPCV2 122 Edge PCIe PME, ath9k

On the working imx6 board output looks like this:

cat /proc/interrupts:

CPU0 CPU1

xxx: x x GPCV2 122 Edge ath9k

Is it possible that there is a problem with PCIe PME?

I'm no PCI Expert, perhaps this is a stupid question :smileywink:

Best regards

Ruben

igorpadykov <admin@community.nxp.com> schrieb am Di., 22. Nov. 2016 um

07:51 Uhr:

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Re: SabreBoard imx7 and pciExpress WLAN Chip ath9k

reply from igorpadykov

<https://community.nxp.com/people/igorpadykov?et=watches.email.thread> in *i.MX

Community* - View the full discussion

<https://community.nxp.com/message/853432?commentID=853432&et=watches.email.thread#comment-853432>

[igorpadykov]

H Ruben

pcie interrupts can be tested with BCM4339 driver which is supported

in official NXP BSPs, please refer to Chapter 46 Wi-Fi attached Linux

Manual.

Best regards
igor