linux-kernel - RE: [RESEND v2 1/5] PCI: imx6: Encapsulate the clock enable into one standalone function

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Date:   Tue, 19 Oct 2021 07:32:55 +0000
From:   Richard Zhu <hongxing.zhu@....com>
To:     Lucas Stach <l.stach@...gutronix.de>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>
CC:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        "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>
Subject: RE: [RESEND v2 1/5] PCI: imx6: Encapsulate the clock enable into one
 standalone function


> -----Original Message-----
> From: Lucas Stach <l.stach@...gutronix.de>
> Sent: Saturday, October 16, 2021 2:14 AM
> To: Richard Zhu <hongxing.zhu@....com>; bhelgaas@...gle.com;
> lorenzo.pieralisi@....com
> Cc: linux-pci@...r.kernel.org; dl-linux-imx <linux-imx@....com>;
> linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org;
> kernel@...gutronix.de
> Subject: Re: [RESEND v2 1/5] PCI: imx6: Encapsulate the clock enable into
> one standalone function
> 
> Am Freitag, dem 15.10.2021 um 14:05 +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>
> 
> Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
> 
[Richard Zhu] Thanks.

Best Regards
Richard Zhu
> > ---
> >  drivers/pci/controller/dwc/pci-imx6.c | 79
> > ++++++++++++++++-----------
> >  1 file changed, 48 insertions(+), 31 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c
> > b/drivers/pci/controller/dwc/pci-imx6.c
> > index 26f49f797b0f..1fa1dba6da81 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > @@ -470,38 +470,16 @@ static int imx6_pcie_enable_ref_clk(struct
> imx6_pcie *imx6_pcie)
> >  	return ret;
> >  }
> >
> > -static void imx7d_pcie_wait_for_phy_pll_lock(struct imx6_pcie
> > *imx6_pcie) -{
> > -	u32 val;
> > -	struct device *dev = imx6_pcie->pci->dev;
> > -
> > -	if (regmap_read_poll_timeout(imx6_pcie->iomuxc_gpr,
> > -				     IOMUXC_GPR22, val,
> > -				     val & IMX7D_GPR22_PCIE_PHY_PLL_LOCKED,
> > -				     PHY_PLL_LOCK_WAIT_USLEEP_MAX,
> > -				     PHY_PLL_LOCK_WAIT_TIMEOUT))
> > -		dev_err(dev, "PCIe PLL lock timeout\n");
> > -}
> > -
> > -static void imx6_pcie_deassert_core_reset(struct imx6_pcie
> > *imx6_pcie)
> > +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;
> >
> > -	if (imx6_pcie->vpcie && !regulator_is_enabled(imx6_pcie->vpcie)) {
> > -		ret = regulator_enable(imx6_pcie->vpcie);
> > -		if (ret) {
> > -			dev_err(dev, "failed to enable vpcie regulator: %d\n",
> > -				ret);
> > -			return;
> > -		}
> > -	}
> > -
> >  	ret = clk_prepare_enable(imx6_pcie->pcie_phy);
> >  	if (ret) {
> >  		dev_err(dev, "unable to enable pcie_phy clock\n");
> > -		goto err_pcie_phy;
> > +		return ret;
> >  	}
> >
> >  	ret = clk_prepare_enable(imx6_pcie->pcie_bus);
> > @@ -524,6 +502,51 @@ static void imx6_pcie_deassert_core_reset(struct
> > imx6_pcie *imx6_pcie)
> >
> >  	/* 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;
> > +}
> > +
> > +static void imx7d_pcie_wait_for_phy_pll_lock(struct imx6_pcie
> > +*imx6_pcie) {
> > +	u32 val;
> > +	struct device *dev = imx6_pcie->pci->dev;
> > +
> > +	if (regmap_read_poll_timeout(imx6_pcie->iomuxc_gpr,
> > +				     IOMUXC_GPR22, val,
> > +				     val & IMX7D_GPR22_PCIE_PHY_PLL_LOCKED,
> > +				     PHY_PLL_LOCK_WAIT_USLEEP_MAX,
> > +				     PHY_PLL_LOCK_WAIT_TIMEOUT))
> > +		dev_err(dev, "PCIe PLL lock timeout\n"); }
> > +
> > +static void imx6_pcie_deassert_core_reset(struct imx6_pcie
> > +*imx6_pcie) {
> > +	struct dw_pcie *pci = imx6_pcie->pci;
> > +	struct device *dev = pci->dev;
> > +	int ret;
> > +
> > +	if (imx6_pcie->vpcie && !regulator_is_enabled(imx6_pcie->vpcie)) {
> > +		ret = regulator_enable(imx6_pcie->vpcie);
> > +		if (ret) {
> > +			dev_err(dev, "failed to enable vpcie regulator: %d\n",
> > +				ret);
> > +			return;
> > +		}
> > +	}
> > +
> > +	ret = imx6_pcie_clk_enable(imx6_pcie);
> > +	if (ret) {
> > +		dev_err(dev, "unable to enable pcie clocks\n");
> > +		goto err_clks;
> > +	}
> >
> >  	/* Some boards don't have PCIe reset GPIO. */
> >  	if (gpio_is_valid(imx6_pcie->reset_gpio)) { @@ -578,13 +601,7 @@
> > 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)
>