> -----Original Message-----
> From: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
> Sent: Saturday, October 16, 2021 2:14 AM
> To: Richard Zhu <hongxing.zhu@xxxxxxx>; bhelgaas@xxxxxxxxxx;
> lorenzo.pieralisi@xxxxxxx
> Cc: linux-pci@xxxxxxxxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx>;
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> kernel@xxxxxxxxxxxxxx
> 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@xxxxxxx>
>
> Reviewed-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
>
[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)
>
