Thank you for looking into this issue. Reporting current status.
== "mwifiex crash after suspend"
This issue might be the Surface devices specific problem? Not sure.
I know some ways to prevent at least mwifiex crashing:
1. Disabling d3cold for wifi device (even doable on mainline kernels):
echo 0 | sudo tee
/sys/devices/pci0000:00/0000:00:1d.3/0000:03:00.0/d3cold_allowed # on SB1
echo 0 | sudo tee
/sys/devices/pci0000:00/0000:00:1d.0/0000:02:00.0/d3cold_allowed # on SP4
2. Your patch "0001-mwifiex-set-PCIE-to-PCI_D0-power-state-on-resume"
3. Disable bridge_d3 on mwifiex_pcie_probe()
pdev->bus->self->bridge_d3 = false;
but with those ways, as I mentioned before (Comment 108), it sometimes
not connect to AP automatically because it fails to find APs (`nmcli d
wifi list` shows empty). This is easily fixed by reloading the
"mwifiex_pcie" module.
Patch for this issue we (linux-surface community) are currently using is, based
this patch from sebanc:
- https://github.com/jakeday/linux-surface/issues/420#issuecomment-544615371
Actual commit is here:
-
https://github.com/linux-surface/kernel/commit/c8da40c0538a1528f3efd85cd91d9e314c85dd19
The patch from sebanc does the following things:
- modify mwifiex_pcie_suspend/mwifiex_pcie_resume functions to fix crash after
suspend.
It seems that the function mwifiex_pcie_suspend2 is from mwifiex_pcie_remove
and the function mwifiex_pcie_resume2 is largely from mwifiex_pcie_probe.
So, I think that it behaves in the same way as we unload modules before
suspend and re-load modules after suspend.
- disable bridge_d3 to fix crash after suspend
- disable "auto deep sleep" (I think not needed for this issue, but introduced
hoping to fix other issues)
I think the patch is too aggressive to be upstreamed as they are, but
please use it as a reference.
The patch also fixes S0ix on KBL/KBL-R devices (such as Surface Book 2,
Surface Pro 5, Surface Laptop 1 or later). SKL devices such as Surface
Pro 4 or Surface Book 1 cannot achieve S0ix anyway because of other
reasons outside of mwifiex.
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https://bugs.launchpad.net/bugs/1730924
Title:
Wifi does down "crash" in Surface Pro 4
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