Low Throughput while using imx6 with wl1837

[sandipsathvara]

Hi NXP Team,

We are using  our custom imx6 board with wl1837 module over SDIO interface. Android release is boundary-imx-kk4.4.3_2.0.0-ga . We have successfully interfaced WL1837 module. WiFi Direct/P2P functionality is working properly.

To check throughput we have created one access point using router. and we are measuring throughput using iperf android utility. but we getting very low throughput ( ~2-3 Mbits/sec ), while access point's link speed is ~72Mbits/sec.

So we are doubting on SDIO speed for low throughput.

we are using below iomuxing in device tree to interface wl1837 with imx6

pinctrl_usdhc3_2: usdhc3grp-2 {
                        fsl,pins = <
                                MX6QDL_PAD_SD3_CMD__SD3_CMD    0x17059
                                MX6QDL_PAD_SD3_CLK__SD3_CLK    0x10059
                                MX6QDL_PAD_SD3_DAT0__SD3_DATA0 0x17059
                                MX6QDL_PAD_SD3_DAT1__SD3_DATA1 0x17059
                                MX6QDL_PAD_SD3_DAT2__SD3_DATA2 0x17059
                                MX6QDL_PAD_SD3_DAT3__SD3_DATA3 0x17059
                        >;

We tried also 0x170D9 iomux value instead of 0x17059 to increase sdio speed. but still we are getting low throughput.

Is our iomuxing values are correct ??

Is our doubt right ???

For your reference I am attaching an image of wifi interface with imx6.

[sandipsathvara]

Hi, 

How can we run sdio interface at the maximum speed ?

Please, reply us as soon as possible....!!

[CarlosCasillas]

Hi Sandip,

So, issues with SDIO communication may be caused by low signal/big noise on SDIO lines, or also on DDR lines; please take a look at the following links for additional details:

https://community.nxp.com/message/875577

https://community.nxp.com/message/888015

https://community.nxp.com/message/517933

Hope this will be useful for you.

Best regards!

/Carlos

[CarlosCasillas]

gary_bisson‌, is there any feedback from Boundary Devices for this case?

[gary_bisson]

Hi,

No because we do not have any platform using the wl1837 (only wl1271) so I doubt this is one of ours.

Therefore, although it is based on our Android release, we can't help much.

Regards,

Gary