can't initial 88W8997 by PCIE

[hilary_tsai]

The wifi SIP module  AW-CM276NF with  88W8997 is design with CPU MT8395.

The PERST0# & W_DISABLE1 are both pulled higha and the ac coupling 100nF are used

The pcie still can't be recognized and is stock at " polling.compliance"

mtk-pcie 112f0000.pcie: PCIe link down, ltssm reg val: 0x0

[    0.907675] mtk-pcie: probe of 112f0000.pcie failed with error -110

[    0.909229] mtk-pcie 112f8000.pcie: host bridge /soc/pcie@112f8000 ranges:

[    0.910131] mtk-pcie 112f8000.pcie:       IO 0x0024000000..0x00241fffff -> 0x0024000000

[    0.911170] mtk-pcie 112f8000.pcie:      MEM 0x0024200000..0x0027ffffff -> 0x0024200000

[    1.118908] mtk-pcie 112f8000.pcie: PCIe link down, ltssm reg val: 0x2000003

[    1.119938] mtk-pcie: probe of 112f8000.pcie failed with error -110

After consulting MTK, they gauss the CPU(MT8395) doesn't get reply from 88W8997, or 88w8997 miss or not recognize the signal from CPU.

can nxp help on this issue?

Does any commend or methods to get the pcie status of 88W8997?

[shaun_wu]

Hello @hilary_tsai 

Have you shard the schematic? The picture you shared is not very clear.

Best Regards

Shaun

[hilary_tsai]

Hi shaun:

the issue is fixed after I removed the AC couping cap on the tx path of WiFI module,

It seem that  the  AC couping cap is designed in module.

Thank for you support.

[shaun_wu]

Hello  @hilary_tsai 

You could send schematic to my email addr: shaun.wu@nxp.com

Best Regards

Shaun

[shaun_wu]

Hello @hilary_tsai 

Could you share your schematic to us?

Best Regards

Shaun

[hilary_tsai]

Hi shaun:

Please check it.

Besides,How can I know that the WIFI IC has started normally? 

the pcie status is stock at " polling.compliance"  Does it mean the wifi ic don't send EIOS to CPU?

[hilary_tsai]

Hi shaun:

sure~~

However, I am not sure that I can share the schematics on the web or not.

May I get your email address and send it you by mail?