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

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Message-ID: <cf0943a1144e91048fc88fe9b11660bafe1a2d8d.camel@pengutronix.de>
Date:   Wed, 16 Mar 2022 10:37:55 +0100
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Richard 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,
        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>

> 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;