linux-kernel - Re: [PATCH v14 17/17] PCI: imx6: Reformat suspend callback to keep symmetric with resume

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Date:   Wed, 13 Jul 2022 11:07:08 +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 17/17] PCI: imx6: Reformat suspend callback to keep
 symmetric with resume

Am Freitag, dem 01.07.2022 um 11:25 +0800 schrieb Richard Zhu:
> Create imx6_pcie_stop_link() and imx6_pcie_host_exit() functions.
> Encapsulate clocks, regulators disables and PHY uninitialization into
> imx6_pcie_host_exit().
> To keep suspend/resume symmetric as much as possible, invoke these two
> new created functions in suspend callback.
> 
> To be symmetric with imx6_pcie_host_exit(), move imx6_pcie_clk_enable()
> to imx6_pcie_host_init() from imx6_pcie_deassert_core_reset().
> 
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>

Reviewed-by: Lucas Stach <l.stach@...gutronix.de>

> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 60 ++++++++++++++++-----------
>  1 file changed, 36 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 1cf8bf9035f2..bf8992a6c238 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -703,13 +703,6 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
>  {
>  	struct dw_pcie *pci = imx6_pcie->pci;
>  	struct device *dev = pci->dev;
> -	int ret;
> -
> -	ret = imx6_pcie_clk_enable(imx6_pcie);
> -	if (ret) {
> -		dev_err(dev, "unable to enable pcie clocks: %d\n", ret);
> -		return ret;
> -	}
>  
>  	switch (imx6_pcie->drvdata->variant) {
>  	case IMX8MQ:
> @@ -905,6 +898,14 @@ static int imx6_pcie_start_link(struct dw_pcie *pci)
>  	return 0;
>  }
>  
> +static void imx6_pcie_stop_link(struct dw_pcie *pci)
> +{
> +	struct device *dev = pci->dev;
> +
> +	/* Turn off PCIe LTSSM */
> +	imx6_pcie_ltssm_disable(dev);
> +}
> +
>  static int imx6_pcie_host_init(struct pcie_port *pp)
>  {
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> @@ -922,11 +923,17 @@ static int imx6_pcie_host_init(struct pcie_port *pp)
>  			return ret;
>  		}
>  	}
> +	ret = imx6_pcie_clk_enable(imx6_pcie);
> +	if (ret) {
> +		dev_err(dev, "unable to enable pcie clocks: %d\n", ret);
> +		goto err_reg_disable;
> +	}
> +
>  	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;
> +			goto err_clk_disable;
>  		}
>  	}
>  
> @@ -947,17 +954,33 @@ static int imx6_pcie_host_init(struct pcie_port *pp)
>  
>  	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_clk_disable:
> +	imx6_pcie_clk_disable(imx6_pcie);
>  err_reg_disable:
>  	if (imx6_pcie->vpcie)
>  		regulator_disable(imx6_pcie->vpcie);
>  	return ret;
>  }
>  
> +static void imx6_pcie_host_exit(struct pcie_port *pp)
> +{
> +	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> +	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
> +
> +	if (imx6_pcie->phy) {
> +		if (phy_power_off(imx6_pcie->phy))
> +			dev_err(pci->dev, "unable to power off PHY\n");
> +		phy_exit(imx6_pcie->phy);
> +	}
> +	imx6_pcie_clk_disable(imx6_pcie);
> +
> +	if (imx6_pcie->vpcie)
> +		regulator_disable(imx6_pcie->vpcie);
> +}
> +
>  static const struct dw_pcie_host_ops imx6_pcie_host_ops = {
>  	.host_init = imx6_pcie_host_init,
>  };
> @@ -1007,25 +1030,14 @@ static void imx6_pcie_pm_turnoff(struct imx6_pcie *imx6_pcie)
>  static int imx6_pcie_suspend_noirq(struct device *dev)
>  {
>  	struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
> +	struct pcie_port *pp = &imx6_pcie->pci->pp;
>  
>  	if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_SUPPORTS_SUSPEND))
>  		return 0;
>  
>  	imx6_pcie_pm_turnoff(imx6_pcie);
> -	imx6_pcie_ltssm_disable(dev);
> -	imx6_pcie_clk_disable(imx6_pcie);
> -	switch (imx6_pcie->drvdata->variant) {
> -	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;
> -	}
> -
> -	if (imx6_pcie->vpcie)
> -		regulator_disable(imx6_pcie->vpcie);
> +	imx6_pcie_stop_link(imx6_pcie->pci);
> +	imx6_pcie_host_exit(pp);
>  
>  	return 0;
>  }