QCA6174 seemingly randomly fails to wake

[theros at openmailbox.org]

Sorry about the late response, I was without my laptop due to an 
unrelated problem.

The patch seems to have fixed the issue - it didn't occur again after 
applying it. I did however use driver backports and applied the patch to 
those myself, as opposed to compiling the entire kernel from the 
repository you provided.

On 2015-11-04 08:30, Michal Kazior wrote:
> On 4 November 2015 at 01:00,  <theros at openmailbox.org> wrote:
>> Hello,
>> 
>> I am having issues with the ath10k driver and the Qualcomm Atheros 
>> QCA6174
>> network adapter. Seemingly randomly, the wireless connection on my 
>> laptop
>> stops working. dmesg outputs a long series of:
>> 
>> [11061.645929] ath10k_pci 0000:07:00.0: failed to wake target for 
>> write32 of
>> 0x0000025c at 0x0003543c: -110
> 
> This looks very similar to how QCA99X0 failed when PCI PS was enabled
> for the card:
> 
>   
> http://lists.infradead.org/pipermail/ath10k/2015-September/005939.html
> 
> As far as I know the reason of failure is not really understood and it
> simply was disabled to fix reliability.
> 
> It seems that QCA6174 suffers from this as well - at least on your
> platform. This is rather sad as we'll probably need to disable it by
> default for QCA6174 now as well which will increase power consumption
> a little bit.
> 
> 
>> Rarely a reboot fixes this and I can use the network adapter again, 
>> but more
>> often than not, after a reboot, there is no output related to ath10k 
>> in
>> dmesg and the laptop is behaving as if the network adapter is not 
>> present.
>> The adapter eventually starts working again - I have not noticed a 
>> specific
>> pattern, sometimes it is after a few hours, sometimes I couldn't get 
>> it
>> working for days.
>> 
>> I have tried thoroughly searching online but was unable to find 
>> anything
>> that would be of help. I do admit I am a little out of my depth here, 
>> but I
>> will happily provide any further information necessary in order to 
>> diagnose
>> and fix this.
>> 
>> I am on Xubuntu 15.10, kernel 4.2.0-16-generic.
> 
> Can you perhaps try compiling the kernel from:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git
> 
> with the following diff applied:
> 
> diff --git a/drivers/net/wireless/ath/ath10k/pci.c
> b/drivers/net/wireless/ath/ath10k/pci.c
> index 3fca200b986c..edf7a7637d88 100644
> --- a/drivers/net/wireless/ath/ath10k/pci.c
> +++ b/drivers/net/wireless/ath/ath10k/pci.c
> @@ -2968,7 +2968,7 @@ static int ath10k_pci_probe(struct pci_dev *pdev,
>         case QCA6164_2_1_DEVICE_ID:
>         case QCA6174_2_1_DEVICE_ID:
>                 hw_rev = ATH10K_HW_QCA6174;
> -               pci_ps = true;
> +               pci_ps = false;
>                 break;
>         case QCA99X0_2_0_DEVICE_ID:
>                 hw_rev = ATH10K_HW_QCA99X0;
> 
> and report back if this fixes the problem for you, please?
> 
> 
> Michał
> 
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