linux-kernel - Re: [PATCH v14 05/17] PCI: imx6: Factor out ref clock disable to match enable

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Date:   Wed, 13 Jul 2022 10:17:31 +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 05/17] PCI: imx6: Factor out ref clock disable to
 match enable

Am Freitag, dem 01.07.2022 um 11:25 +0800 schrieb Richard Zhu:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> The PCIe ref clocks are specific to different variants.  The enables are
> already split out into imx6_pcie_enable_ref_clk(), but the disables were
> combined with the more generic bus/phy/pcie clock disables in
> imx6_pcie_clk_disable().
> 
> Split out the variant-specific disables into imx6_pcie_disable_ref_clk() to
> match imx6_pcie_enable_ref_clk().
> 
> No functional change intended.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> Acked-by: Richard Zhu <hongxing.zhu@....com>

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

> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 16 ++++++++++------
>  1 file changed, 10 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 38f208eea2d7..f458461880dc 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -580,12 +580,8 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
>  	return ret;
>  }
>  
> -static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
> +static void imx6_pcie_disable_ref_clk(struct imx6_pcie *imx6_pcie)
>  {
> -	clk_disable_unprepare(imx6_pcie->pcie);
> -	clk_disable_unprepare(imx6_pcie->pcie_phy);
> -	clk_disable_unprepare(imx6_pcie->pcie_bus);
> -
>  	switch (imx6_pcie->drvdata->variant) {
>  	case IMX6SX:
>  		clk_disable_unprepare(imx6_pcie->pcie_inbound_axi);
> @@ -595,8 +591,8 @@ static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
>  				   IMX7D_GPR12_PCIE_PHY_REFCLK_SEL,
>  				   IMX7D_GPR12_PCIE_PHY_REFCLK_SEL);
>  		break;
> -	case IMX8MQ:
>  	case IMX8MM:
> +	case IMX8MQ:
>  		clk_disable_unprepare(imx6_pcie->pcie_aux);
>  		break;
>  	default:
> @@ -604,6 +600,14 @@ static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
>  	}
>  }
>  
> +static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
> +{
> +	clk_disable_unprepare(imx6_pcie->pcie);
> +	clk_disable_unprepare(imx6_pcie->pcie_phy);
> +	clk_disable_unprepare(imx6_pcie->pcie_bus);
> +	imx6_pcie_disable_ref_clk(imx6_pcie);
> +}
> +
>  static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
>  {
>  	struct device *dev = imx6_pcie->pci->dev;