Subject: Re: wl1251_sdio PSM
From: GNUtoo <GNUtoo@no-log.org>
To: linux-wireless@vger.kernel.org
In-Reply-To: <1272230300.2349.23.camel@gnutoo-desktop>
References: <1272230300.2349.23.camel@gnutoo-desktop>
Content-Type: text/plain; charset="UTF-8"
Date: Sun, 25 Apr 2010 23:57:51 +0200
Message-ID: <1272232671.2349.25.camel@gnutoo-desktop>
Mime-Version: 1.0
Sender: linux-wireless-owner@vger.kernel.org

On Sun, 2010-04-25 at 23:18 +0200, GNUtoo wrote:
> Hi,
> We are trying to make the htc dream(also known as G1) android phone
> usable with a standard GNU(non android) userland.
> 
> Inside the htcdream there is a wl1251_sdio chip.
> 
> We already use the wl1251_sdio driver with a special module for
> initialization.
> 
> The problem is that When the wifi is on,the battery last for about an
> hour.
> 
> So we definitely need power saving features like PSM(I hope I used the
> right acronym,I'm looking for the system which makes the access point
> buffer frames for the phone and then we request the frames,other power
> saving mode are also welcome but as I understood this one is the most
> important)
> 
> Grepping for psm in the driver show that there is some sort of support
> for PSM.
> 
> Unfortunately the following method of activation failed:
> 
> # ./iw dev wlan0 set power_save on
> command failed: Operation not supported (-95)
> 
> 
> # iwconfig wlan0 power period 2 
> Error for wireless request "Set Power Management" (8B2C) :
>     invalid argument "2".
> 
> and I didn't find a psm sys node.
> 
> I wonder where it has been disabled,and if I can re-enable it.
> 
> I was also told that most driver have psm disabled,I don't know the
> reason tough(maybe performance,as it has a serious impact on
> performance)
> 
> our (bad quality)kenrel tree can be found here(we're not yet kernel
> hackers):
iwconfig wlan0 power on now works
I wonder if it really does something tough,I will test

I changed added | IEEE80211_HW_SUPPORTS_PS in:
wl->hw->flags = IEEE80211_HW_SIGNAL_DBM |
                IEEE80211_HW_NOISE_DBM;

Denis.