netdev - Re: [PATCH 6/7] net: wireless: wcn36xx: remove powersaving for wcn3620

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Date:	Tue, 10 Feb 2015 05:07:28 +0800
From:	Andy Green <andy.green@...aro.org>
To:	Bjorn Andersson <bjorn@...o.se>
Cc:	Kalle Valo <kvalo@...eaurora.org>,
	Eugene Krasnikov <k.eugene.e@...il.com>,
	wcn36xx <wcn36xx@...ts.infradead.org>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 6/7] net: wireless: wcn36xx: remove powersaving for wcn3620

On 10 February 2015 at 01:54, Bjorn Andersson <bjorn@...o.se> wrote:
> On Sat, Jan 17, 2015 at 9:11 PM, Andy Green <andy.green@...aro.org> wrote:
>> WCN3620 powersaving mode is not stable.  Disable it if we're
>> on a wcn3620 chip type.
>>
>> Signed-off-by: Andy Green <andy.green@...aro.org>
>> ---
>>  drivers/net/wireless/ath/wcn36xx/main.c |    4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c
>> index c4178c7..569d45b 100644
>> --- a/drivers/net/wireless/ath/wcn36xx/main.c
>> +++ b/drivers/net/wireless/ath/wcn36xx/main.c
>> @@ -924,6 +924,10 @@ static int wcn36xx_init_ieee80211(struct wcn36xx *wcn)
>>                 IEEE80211_HW_AMPDU_AGGREGATION |
>>                 IEEE80211_HW_TIMING_BEACON_ONLY;
>>
>> +       /* 3620 powersaving currently unstable */
>> +       if (wcn->chip_version == WCN36XX_CHIP_3620)
>> +               wcn->hw->flags &= ~IEEE80211_HW_SUPPORTS_PS;
>> +
>
> Hi Andy,
>
> I have the same problem (Data Abort Exception in wcnss) on 3680, this
> with my wip smd code and a hacked up remoteproc-pil. I haven't spent
> any effort on debugging this, but it looks like it's something related
> to what we have ported to mainline (or lack thereof) rather than a
> 3620 specific issue.

Makes sense since I only have 3620, I assumed it's related to that.

However he can work for a while with powersaving on, but ping
latencies are +600-800ms and he's shaky.

Later I found something mac80211 generic scan preparation or post-scan
code (for scan initiated by wpa_supplicant) is able to stop wlan
traffic after a few goes even if the actual scan mode smd is not sent.

At that point I think a nice solution would be a donation of time from
guys who specialize in wcn for a living to come and hand out a pony or
two...

-Andy

> Regards,
> Bjorn
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