From mboxrd@z Thu Jan  1 00:00:00 1970
From: Roger Quadros <rogerq@ti.com>
Subject: Re: [PATCH v3 2/3] ata: ahci_platform: Manage SATA PHY
Date: Wed, 8 Jan 2014 17:03:08 +0530
Message-ID: <52CD3774.3060701@ti.com>
References: <1389174428-31414-1-git-send-email-rogerq@ti.com> <1389174428-31414-3-git-send-email-rogerq@ti.com> <52CD2176.6050102@ti.com> <6214646.nAF6lzWV79@wuerfel> <52CD364F.4060104@ti.com>
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To: Arnd Bergmann <arnd@arndb.de>, Kishon Vijay Abraham I <kishon@ti.com>
Cc: tj@kernel.org, sergei.shtylyov@cogentembedded.com, b.zolnierkie@samsung.com, hdegoede@redhat.com, linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Balaji T K <balajitk@ti.com>
List-Id: devicetree@vger.kernel.org

On 01/08/2014 04:58 PM, Roger Quadros wrote:
> On 01/08/2014 03:35 PM, Arnd Bergmann wrote:
>> On Wednesday 08 January 2014 15:29:18 Kishon Vijay Abraham I wrote:
>>>> +     hpriv->phy = devm_phy_get(dev, "sata-phy");
>>>> +     if (IS_ERR(hpriv->phy)) {
>>>> +             dev_dbg(dev, "can't get sata-phy\n");
>>>> +             /* return only if -EPROBE_DEFER */
>>>> +             if (PTR_ERR(hpriv->phy) == -EPROBE_DEFER) {
>>>> +                     rc = -EPROBE_DEFER;
>>>> +                     goto disable_unprepare_clk;
>>>> +             }
>>>> +     }
>>
>> This should probably check for all errors except "not present"
>> rather than checking for -EPROBE_DEFER. We want to abort the
>> probe function for deferred probe as well as the case where we
>> a PHY was listed but isn't working properly.
> 
> OK.
> 
>>
>>>> +     if (!IS_ERR(hpriv->phy)) {
>>>> +             phy_init(hpriv->phy);
>>>
>>> Don't we have to check the return values of phy_init and phy_power_on? Is it
>>> not needed because it is an optional phy?
>>
>> Right. I think we should set hpriv->phy to NULL if it's not there and
>> then call the functions only if it's actually present but bail out on
>> an error.
> 
> OK. How does this look?
> 
> hpriv->phy = devm_phy_get(dev, "sata-phy");
> if (IS_ERR(hpriv->phy)) {
> 	if (PTR_ERR(hpriv->phy) == -ENODEV)
> 		goto continue;

yikes :P
		goto phyinit;
> 
> 	dev_err(dev, "couldn't get sata-phy\n");
> 	rc = PTR_ERR(hpriv->phy);
> 	goto disable_unprepare_clk;
> }
> 
> continue:
phyinit:

> 
> if (!IS_ERR(hpriv->phy)) {
> 	rc = phy_init(hpriv->phy);
> 	if (rc)
> 		goto disable_unprepare_clk;
> 
> 	rc = phy_power_on(hpriv->phy);
> 	if (rc) {
> 		phy_exit(hpriv->phy);
> 		goto disable_unprepare_clk;
> 	}
> }
> 
> cheers,
> -roger
>