From: Tony Lindgren <tony@atomide.com>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Kalle Valo <kvalo@codeaurora.org>, Eyal Reizer <eyalr@ti.com>,
Kishon Vijay Abraham I <kishon@ti.com>, Guy Mishol <guym@ti.com>,
linux-wireless@vger.kernel.org,
linux-omap <linux-omap@vger.kernel.org>,
Anders Roxell <anders.roxell@linaro.org>,
John Stultz <john.stultz@linaro.org>,
Ricardo Salveti <rsalveti@rsalveti.net>
Subject: Re: [PATCH] wlcore: Fix bringing up wlan0 again if powered down briefly
Date: Thu, 20 Dec 2018 15:14:01 -0800 [thread overview]
Message-ID: <20181220231401.GG6707@atomide.com> (raw)
In-Reply-To: <CAPDyKFr2xx6fmdgjd10C1jekWg-yZPk32fGWEPO2PyexjofJ1A@mail.gmail.com>
* Ulf Hansson <ulf.hansson@linaro.org> [181220 10:15]:
> On Tue, 18 Dec 2018 at 16:54, Tony Lindgren <tony@atomide.com> wrote:
> >
> > Hi,
> >
> > * Ulf Hansson <ulf.hansson@linaro.org> [181218 12:34]:
> > > Instead, it looks like what you need, is a way to keep track of
> > > whether the SDIO card, became power cycled or if it stayed powered on,
> > > when "ifconfig wlan0 up" is done. In case of a power cycle, you need
> > > to re-program the firmware, right?
> >
> > Yeah mostly. But we also need to ensure things do get powered down
> > properly after ifconfig wlan0 down :) IMO after ifconfig wlan0 down
> > returns, there should be no waiting needed.
> >
> > > Would it be possible to re-program the firmware, even if the SDIO card
> > > stayed powered-on?
> >
> > That might help for some cases, but the problem of how to ensure the
> > card is powered down after ifconfig wlan0 down returns still exists.
>
> Well, does the SDIO card really have to be powered down before
> "ifconfig wlan0 down" returns? If so, why?
Good question. Eyal, any comments what should happen here from
the wlcore hardware point of view?
> An option would be to call pm_runtime_get_sync() at "ifconfig wlan0
> up" (I assume you already do that) and then re-program the firmware,
> even if the card hasn't been power cycled. Wouldn't that work?
Ricardo, care to test and see if the problem comes back if you
keep PM runtime enabled?
> Or perhaps this is the problem you are encountering, that the FW can't
> be reprogrammed, unless the card has been power cycled? You can easily
> test that, by simply bumping the runtime usage count for the card
> device via sysfs, before doing the "ifconfig wlan0 up/down" thingy.
Ricardo, care to play with this too?
Regards,
Tony
next prev parent reply other threads:[~2018-12-20 23:14 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-17 16:42 [PATCH] wlcore: Fix bringing up wlan0 again if powered down briefly Tony Lindgren
2018-12-18 1:06 ` Ricardo Salveti
2018-12-18 12:34 ` Ulf Hansson
2018-12-18 15:54 ` Tony Lindgren
2018-12-20 10:14 ` Ulf Hansson
2018-12-20 23:14 ` Tony Lindgren [this message]
2018-12-23 7:38 ` [EXTERNAL] " Reizer, Eyal
2018-12-23 16:02 ` Tony Lindgren
2018-12-28 11:01 ` Ulf Hansson
2018-12-28 19:59 ` Tony Lindgren
2019-01-02 12:01 ` Ulf Hansson
2019-01-07 15:18 ` Tony Lindgren
2019-01-07 16:12 ` Kalle Valo
2019-01-14 13:47 ` Ulf Hansson
2018-12-28 9:48 ` Ulf Hansson
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