linux-kernel - Re: [PATCH v5 0/4] ata: ahci_platform: Add PHY support and OMAP support

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Date:	Tue, 21 Jan 2014 10:34:58 +0200
From:	Roger Quadros <rogerq@...com>
To:	Hans de Goede <hdegoede@...hat.com>, <tj@...nel.org>,
	<kishon@...com>
CC:	<sergei.shtylyov@...entembedded.com>, <b.zolnierkie@...sung.com>,
	<arnd@...db.de>, <linux-ide@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v5 0/4] ata: ahci_platform: Add PHY support and OMAP support

On 01/20/2014 06:48 PM, Hans de Goede wrote:
> Hi,
> 
> On 01/20/2014 03:41 PM, Roger Quadros wrote:
>> Hi,
>>
>> Some platforms have a PHY hooked up to the SATA controller.
>> The PHY needs to be initialized and powered up for SATA to work.
>> We do that using the Generic PHY framework in PATCH 3.
>>
>> In order to support SATA on the OMAP platforms we need to runtime
>> resume the device before use. PATCH 4 takes care of that.
> 
> Thanks for keeping me in the loop on this. I'm afraid this conflicts
> quite a bit with my recent ahci_platform.c work, not a big problem
> really, the series can go in either way.
> 
> Your phy support will slot nicely into the new ahci_platform_get_resources
> and ahci_platform_enable_resources functions my refactoring introduces,
> looking at it from this pov it might be better / easier to rebase your series
> on top of the v4 of my series I've just send.
> 
> Which brings me to one comment about your series why are you not doing phy_exit
> and phy_init on suspend resp. resume ? The phy can use quite a bit of power,
> if the phy init / exit end up in ahci_platform_enable_resources /
> ahci_platform_disable_resources, this will happen automatically for better or
> worse. So it would be good to test if this would work or not ...

Right. Bartlomiej had pointed this out earlier, but I just wasn't very sure about it.

Is it sufficient to just call phy_power_off() in suspend and phy_power_on() in resume?
Or do we call phy_exit() and phy_init() respectively as well.

Kishon, any suggestions?

cheers,
-roger
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