RE: [PATCH v12 03/13] PCI: imx6: Move imx6_pcie_enable_ref_clk() earlier

[Hongxing Zhu]

> -----Original Message-----
> From: Bjorn Helgaas <helgaas@xxxxxxxxxx>
> Sent: 2022年6月16日 7:16
> To: Hongxing Zhu <hongxing.zhu@xxxxxxx>; Lucas Stach
> <l.stach@xxxxxxxxxxxxxx>; Rob Herring <robh+dt@xxxxxxxxxx>; Mark Brown
> <broonie@xxxxxxxxxx>; Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>; Fabio
> Estevam <festevam@xxxxxxxxx>; Francesco Dolcini
> <francesco.dolcini@xxxxxxxxxxx>
> Cc: linux-pci@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx; kernel@xxxxxxxxxxxxxx; dl-linux-imx
> <linux-imx@xxxxxxx>; Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> Subject: [PATCH v12 03/13] PCI: imx6: Move imx6_pcie_enable_ref_clk()
> earlier
> 
> From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> 
> Move imx6_pcie_enable_ref_clk() earlier so it's not in the middle between
> imx6_pcie_assert_core_reset() and imx6_pcie_deassert_core_reset().  No
> functional change intended.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Acked-by: Richard Zhu <hongxing.zhu@xxxxxxx>

Best Regards
Richard Zhu
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 96 +++++++++++++--------------
>  1 file changed, 48 insertions(+), 48 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c
> b/drivers/pci/controller/dwc/pci-imx6.c
> index e63eb6380020..a6d2b907d42b 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -520,54 +520,6 @@ static int imx6_pcie_attach_pd(struct device *dev)
>  	return 0;
>  }
> 
> -static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie) -{
> -	struct device *dev = imx6_pcie->pci->dev;
> -
> -	switch (imx6_pcie->drvdata->variant) {
> -	case IMX7D:
> -	case IMX8MQ:
> -		reset_control_assert(imx6_pcie->pciephy_reset);
> -		fallthrough;
> -	case IMX8MM:
> -		reset_control_assert(imx6_pcie->apps_reset);
> -		break;
> -	case IMX6SX:
> -		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> -				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
> -				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
> -		/* Force PCIe PHY reset */
> -		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> -				   IMX6SX_GPR5_PCIE_BTNRST_RESET,
> -				   IMX6SX_GPR5_PCIE_BTNRST_RESET);
> -		break;
> -	case IMX6QP:
> -		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -				   IMX6Q_GPR1_PCIE_SW_RST,
> -				   IMX6Q_GPR1_PCIE_SW_RST);
> -		break;
> -	case IMX6Q:
> -		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -				   IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18);
> -		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> -				   IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
> -		break;
> -	}
> -
> -	if (imx6_pcie->vpcie && regulator_is_enabled(imx6_pcie->vpcie) > 0) {
> -		int ret = regulator_disable(imx6_pcie->vpcie);
> -
> -		if (ret)
> -			dev_err(dev, "failed to disable vpcie regulator: %d\n",
> -				ret);
> -	}
> -
> -	/* Some boards don't have PCIe reset GPIO. */
> -	if (gpio_is_valid(imx6_pcie->reset_gpio))
> -		gpio_set_value_cansleep(imx6_pcie->reset_gpio,
> -					imx6_pcie->gpio_active_high);
> -}
> -
>  static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)  {
>  	struct dw_pcie *pci = imx6_pcie->pci;
> @@ -628,6 +580,54 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie
> *imx6_pcie)
>  	return ret;
>  }
> 
> +static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie) {
> +	struct device *dev = imx6_pcie->pci->dev;
> +
> +	switch (imx6_pcie->drvdata->variant) {
> +	case IMX7D:
> +	case IMX8MQ:
> +		reset_control_assert(imx6_pcie->pciephy_reset);
> +		fallthrough;
> +	case IMX8MM:
> +		reset_control_assert(imx6_pcie->apps_reset);
> +		break;
> +	case IMX6SX:
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> +				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
> +				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
> +		/* Force PCIe PHY reset */
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> +				   IMX6SX_GPR5_PCIE_BTNRST_RESET,
> +				   IMX6SX_GPR5_PCIE_BTNRST_RESET);
> +		break;
> +	case IMX6QP:
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +				   IMX6Q_GPR1_PCIE_SW_RST,
> +				   IMX6Q_GPR1_PCIE_SW_RST);
> +		break;
> +	case IMX6Q:
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +				   IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18);
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> +				   IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
> +		break;
> +	}
> +
> +	if (imx6_pcie->vpcie && regulator_is_enabled(imx6_pcie->vpcie) > 0) {
> +		int ret = regulator_disable(imx6_pcie->vpcie);
> +
> +		if (ret)
> +			dev_err(dev, "failed to disable vpcie regulator: %d\n",
> +				ret);
> +	}
> +
> +	/* Some boards don't have PCIe reset GPIO. */
> +	if (gpio_is_valid(imx6_pcie->reset_gpio))
> +		gpio_set_value_cansleep(imx6_pcie->reset_gpio,
> +					imx6_pcie->gpio_active_high);
> +}
> +
>  static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)  {
>  	struct dw_pcie *pci = imx6_pcie->pci;
> --
> 2.25.1