linux-kernel - RE: [PATCH] PCI: imx6: Invoke the PHY exit function after PHY power off

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Message-ID: <AS8PR04MB86761853B899882338FCE8678C129@AS8PR04MB8676.eurprd04.prod.outlook.com>
Date:   Thu, 17 Mar 2022 00:29:55 +0000
From:   Hongxing Zhu <hongxing.zhu@....com>
To:     Lucas Stach <l.stach@...gutronix.de>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>
CC:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH] PCI: imx6: Invoke the PHY exit function after PHY power
 off

> -----Original Message-----
> From: Lucas Stach <l.stach@...gutronix.de>
> Sent: 2022年3月16日 17:38
> To: Hongxing Zhu <hongxing.zhu@....com>; bhelgaas@...gle.com;
> lorenzo.pieralisi@....com
> Cc: linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org; kernel@...gutronix.de; dl-linux-imx
> <linux-imx@....com>
> Subject: Re: [PATCH] PCI: imx6: Invoke the PHY exit function after PHY power
> off
> 
> Am Donnerstag, dem 03.03.2022 um 14:34 +0800 schrieb Richard Zhu:
> > To balance phy->init_count, invoke the phy_exit() after phy_power_off().
> >
> This looks okay as a fix, but overall I don't like that we need to have special PHY
> handling in the suspend path and PHY init hidden in
> imx6_pcie_assert_core_reset() in the resume path. Maybe we can make this
> PHY handling a bit more obvious by splitting it out of the core reset sequence. I
> don't see the full implications of such a change yet, but I think we should at
> least give it a try.
> 
> For now, this patch is:
> Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
Hi Lucas:
Thanks for your review comment.
Agree with you, the PHY handling shouldn't be include in the reset function.
I would plan to refine the PHY handling after this fix.

Best Regards
Richard Zhu

> 
> > Fixes: 178e244cb6e2 ("PCI: imx: Add the imx8mm pcie support")
> > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> > ---
> >  drivers/pci/controller/dwc/pci-imx6.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c
> > b/drivers/pci/controller/dwc/pci-imx6.c
> > index 331490614d55..343fe1429e3c 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > @@ -973,6 +973,7 @@ static int imx6_pcie_suspend_noirq(struct device
> *dev)
> >  	case IMX8MM:
> >  		if (phy_power_off(imx6_pcie->phy))
> >  			dev_err(dev, "unable to power off PHY\n");
> > +		phy_exit(imx6_pcie->phy);
> >  		break;
> >  	default:
> >  		break;
>