linux-kernel - Re: [PATCH 1/3] PCI: imx: encapsulate the clock enable into one standalone function

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Message-ID: <125bd22edb69ce38a18bcc80c6507da28e8eb185.camel@pengutronix.de>
Date:   Wed, 08 Sep 2021 10:47:39 +0200
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-imx@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de
Subject: Re: [PATCH 1/3] PCI: imx: encapsulate the clock enable into one
 standalone function

Am Mittwoch, dem 08.09.2021 um 14:59 +0800 schrieb Richard Zhu:
> No function changes, just encapsulate the i.MX PCIe clocks enable
> operations into one standalone function
> 
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 82 +++++++++++++++++----------
>  1 file changed, 51 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 80fc98acf097..0264432e4c4a 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -143,6 +143,8 @@ struct imx6_pcie {
>  #define PHY_RX_OVRD_IN_LO_RX_DATA_EN		BIT(5)
>  #define PHY_RX_OVRD_IN_LO_RX_PLL_EN		BIT(3)
>  
> +static int imx6_pcie_clk_enable(struct imx6_pcie *imx6_pcie);
> +
I don't think this is strictly needed. Can you just move the placement
of the new imx6_pcie_clk_enable function in the file, such that we can
avoid the forward declaration?

>  static int pcie_phy_poll_ack(struct imx6_pcie *imx6_pcie, bool exp_val)
>  {
>  	struct dw_pcie *pci = imx6_pcie->pci;
> @@ -498,33 +500,12 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
>  		}
>  	}
>  
> -	ret = clk_prepare_enable(imx6_pcie->pcie_phy);
> -	if (ret) {
> -		dev_err(dev, "unable to enable pcie_phy clock\n");
> -		goto err_pcie_phy;
> -	}
> -
> -	ret = clk_prepare_enable(imx6_pcie->pcie_bus);
> +	ret = imx6_pcie_clk_enable(imx6_pcie);
>  	if (ret) {
> -		dev_err(dev, "unable to enable pcie_bus clock\n");
> -		goto err_pcie_bus;
> +		dev_err(dev, "unable to enable pcie clocks\n");
> +		goto err_clks;
>  	}
>  
> -	ret = clk_prepare_enable(imx6_pcie->pcie);
> -	if (ret) {
> -		dev_err(dev, "unable to enable pcie clock\n");
> -		goto err_pcie;
> -	}
> -
> -	ret = imx6_pcie_enable_ref_clk(imx6_pcie);
> -	if (ret) {
> -		dev_err(dev, "unable to enable pcie ref clock\n");
> -		goto err_ref_clk;
> -	}
> -
> -	/* allow the clocks to stabilize */
> -	usleep_range(200, 500);
> -
>  	/* Some boards don't have PCIe reset GPIO. */
>  	if (gpio_is_valid(imx6_pcie->reset_gpio)) {
>  		gpio_set_value_cansleep(imx6_pcie->reset_gpio,
> @@ -578,13 +559,7 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
>  
>  	return;
>  
> -err_ref_clk:
> -	clk_disable_unprepare(imx6_pcie->pcie);
> -err_pcie:
> -	clk_disable_unprepare(imx6_pcie->pcie_bus);
> -err_pcie_bus:
> -	clk_disable_unprepare(imx6_pcie->pcie_phy);
> -err_pcie_phy:
> +err_clks:
>  	if (imx6_pcie->vpcie && regulator_is_enabled(imx6_pcie->vpcie) > 0) {
>  		ret = regulator_disable(imx6_pcie->vpcie);
>  		if (ret)
> @@ -914,6 +889,51 @@ static void imx6_pcie_pm_turnoff(struct imx6_pcie *imx6_pcie)
>  	usleep_range(1000, 10000);
>  }
>  
> +static int imx6_pcie_clk_enable(struct imx6_pcie *imx6_pcie)
> +{
> +	struct dw_pcie *pci = imx6_pcie->pci;
> +	struct device *dev = pci->dev;
> +	int ret;
> +
> +	ret = clk_prepare_enable(imx6_pcie->pcie_phy);
> +	if (ret) {
> +		dev_err(dev, "unable to enable pcie_phy clock\n");
> +		return ret;
> +	}
> +
> +	ret = clk_prepare_enable(imx6_pcie->pcie_bus);
> +	if (ret) {
> +		dev_err(dev, "unable to enable pcie_bus clock\n");
> +		goto err_pcie_bus;
> +	}
> +
> +	ret = clk_prepare_enable(imx6_pcie->pcie);
> +	if (ret) {
> +		dev_err(dev, "unable to enable pcie clock\n");
> +		goto err_pcie;
> +	}
> +
> +	ret = imx6_pcie_enable_ref_clk(imx6_pcie);
> +	if (ret) {
> +		dev_err(dev, "unable to enable pcie ref clock\n");
> +		goto err_ref_clk;
> +	}
> +
> +	/* allow the clocks to stabilize */
> +	usleep_range(200, 500);
> +	return 0;
> +
> +err_ref_clk:
> +	clk_disable_unprepare(imx6_pcie->pcie);
> +err_pcie:
> +	clk_disable_unprepare(imx6_pcie->pcie_bus);
> +err_pcie_bus:
> +	clk_disable_unprepare(imx6_pcie->pcie_phy);
> +
> +	return ret;
> +
Superfluous newline.

Regards,
Lucas
 
> +}
> +
>  static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
>  {
>  	clk_disable_unprepare(imx6_pcie->pcie);