netdev - Re: Suspend of SDIO function devices

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Date:   Tue, 26 Jun 2018 22:34:39 +0200
From:   Daniel Mack <daniel@...que.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Chris Ball <chris@...ntf.net>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "libertas-dev@...ts.infradead.org" <libertas-dev@...ts.infradead.org>,
        linux-wireless@...r.kernel.org,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Suspend of SDIO function devices

Hi Ulf,

Thanks for the prompt reply!

On Monday, June 25, 2018 05:00 PM, Ulf Hansson wrote:
> On 24 June 2018 at 22:46, Daniel Mack <daniel@...que.org> wrote:
>> Please advise, I'm happy to test approaches and send patches.
> 
>  From a top level point of view, I think this needs to be changed:
> 
> 1)
> In cases when the libertas sdio driver's ->suspend() callback, thinks
> of returning -ENOSYS, it should instead call if_sdio_power_off().
> Depending if if_sdio_power_save() has already been called, this shall
> be skipped.
> 
> The important thing here is to disable the SDIO func device and to
> release the SDIO irq.
> 
> 2)
> During resume, depending on whether the earlier ->suspend() callback
> invoked if_sdio_power_off(),  libertas sdio driver's ->resume()
> callback should call if_sdio_power_on().
> 
> This should re-initiate the libertas sdio device and re-program the
> firmware. To complete these actions, the firmware file also needs to
> be fetched, which requires file system accesses also to be resumed.
> 
> We also need to wait for the firmware programming to be completed,
> hence also do a "wait_event(card->pwron_waitq, priv->fw_ready);" from
> somewhere.

Great, thanks, that helped a lot! I have something that does the job ob 
my board. Will send out a patch shortly.


Best regards,
Daniel