linux-kernel - Re: [PATCH v14 14/17] PCI: imx6: Do not hide phy driver callbacks and refine the error handling

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Date:   Wed, 13 Jul 2022 10:58:45 +0200
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Richard Zhu <hongxing.zhu@....com>, bhelgaas@...gle.com,
        robh+dt@...nel.org, broonie@...nel.org, lorenzo.pieralisi@....com,
        festevam@...il.com, francesco.dolcini@...adex.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 v14 14/17] PCI: imx6: Do not hide phy driver callbacks
 and refine the error handling

Am Freitag, dem 01.07.2022 um 11:25 +0800 schrieb Richard Zhu:
> - Move the phy_power_on() to host_init from imx6_pcie_clk_enable().
> - Move the phy_init() to host_init from imx6_pcie_deassert_core_reset().
> 
> Refine the error handling in imx6_pcie_host_init() accordingly.
> 
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 34 +++++++++++++++++----------
>  1 file changed, 21 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 5a06fbca82d6..0b2a5256fb0d 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -639,14 +639,6 @@ static int imx6_pcie_clk_enable(struct imx6_pcie *imx6_pcie)
>  		goto err_ref_clk;
>  	}
>  
> -	switch (imx6_pcie->drvdata->variant) {
> -	case IMX8MM:
> -		if (phy_power_on(imx6_pcie->phy))
> -			dev_err(dev, "unable to power on PHY\n");
> -		break;
> -	default:
> -		break;
> -	}
>  	/* allow the clocks to stabilize */
>  	usleep_range(200, 500);
>  	return 0;
> @@ -723,10 +715,6 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
>  	case IMX8MQ:
>  		reset_control_deassert(imx6_pcie->pciephy_reset);
>  		break;
> -	case IMX8MM:
> -		if (phy_init(imx6_pcie->phy))
> -			dev_err(dev, "waiting for phy ready timeout!\n");
> -		break;
>  	case IMX7D:
>  		reset_control_deassert(imx6_pcie->pciephy_reset);
>  
> @@ -762,6 +750,7 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
>  		usleep_range(200, 500);
>  		break;
>  	case IMX6Q:		/* Nothing to do */
> +	case IMX8MM:
>  		break;
>  	}
>  
> @@ -913,17 +902,36 @@ static int imx6_pcie_host_init(struct pcie_port *pp)
>  			return ret;
>  		}
>  	}
> +	if (imx6_pcie->phy) {
> +		ret = phy_power_on(imx6_pcie->phy);
> +		if (ret) {
> +			dev_err(dev, "pcie phy power up failed.\n");
> +			goto err_reg_disable;
> +		}
> +	}
>  
>  	ret = imx6_pcie_deassert_core_reset(imx6_pcie);
>  	if (ret < 0) {
>  		dev_err(dev, "pcie deassert core reset failed: %d\n", ret);
> -		goto err_reg_disable;
> +		goto err_phy_off;
>  	}
>  
> +	if (imx6_pcie->phy) {
> +		ret = phy_init(imx6_pcie->phy);
> +		if (ret) {
> +			dev_err(dev, "waiting for phy ready timeout!\n");
> +			goto err_clk_disable;
> +		}
> +	}

Wouldn't it be more logical to put this into imx6_pcie_init_phy()?

Regards,
Lucas

>  	imx6_setup_phy_mpll(imx6_pcie);
>  
>  	return 0;
>  
> +err_clk_disable:
> +	imx6_pcie_clk_disable(imx6_pcie);
> +err_phy_off:
> +	if (imx6_pcie->phy)
> +		phy_power_off(imx6_pcie->phy);
>  err_reg_disable:
>  	if (imx6_pcie->vpcie)
>  		regulator_disable(imx6_pcie->vpcie);