linux-kernel - RE: [PATCH v12 05/13] PCI: imx6: Factor out ref clock disable to match enable

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Date:   Thu, 16 Jun 2022 02:23:50 +0000
From:   Hongxing Zhu <hongxing.zhu@....com>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Lucas Stach <l.stach@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Fabio Estevam <festevam@...il.com>,
        Francesco Dolcini <francesco.dolcini@...adex.com>
CC:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: RE: [PATCH v12 05/13] PCI: imx6: Factor out ref clock disable to
 match enable

> -----Original Message-----
> From: Bjorn Helgaas <helgaas@...nel.org>
> Sent: 2022年6月16日 7:16
> To: Hongxing Zhu <hongxing.zhu@....com>; Lucas Stach
> <l.stach@...gutronix.de>; Rob Herring <robh+dt@...nel.org>; Mark Brown
> <broonie@...nel.org>; Lorenzo Pieralisi <lorenzo.pieralisi@....com>; Fabio
> Estevam <festevam@...il.com>; Francesco Dolcini
> <francesco.dolcini@...adex.com>
> Cc: linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org; kernel@...gutronix.de; dl-linux-imx
> <linux-imx@....com>; Bjorn Helgaas <bhelgaas@...gle.com>
> Subject: [PATCH v12 05/13] PCI: imx6: Factor out ref clock disable to match
> enable
> 
> 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>

Best Regards
Richard Zhu
> ---
>  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;
> --
> 2.25.1