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[PATCH v2] PCI: imx6: Enable the vpcie regulator when fetch it

Richard Zhu posted 1 patch 7 months, 3 weeks ago 
drivers/pci/controller/dwc/pci-imx6.c | 27 ++++-----------------------
1 file changed, 4 insertions(+), 23 deletions(-)
[PATCH v2] PCI: imx6: Enable the vpcie regulator when fetch it
Posted by Richard Zhu 7 months, 3 weeks ago 
Enable the vpcie regulator at probe time and keep it enabled for the
entire PCIe controller lifecycle. This ensures support for outbound
wake-up mechanism such as WAKE# signaling.

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
---
 drivers/pci/controller/dwc/pci-imx6.c | 27 ++++-----------------------
 1 file changed, 4 insertions(+), 23 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 5a38cfaf989b..7cab4bcfae56 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -159,7 +159,6 @@ struct imx_pcie {
 	u32			tx_deemph_gen2_6db;
 	u32			tx_swing_full;
 	u32			tx_swing_low;
-	struct regulator	*vpcie;
 	struct regulator	*vph;
 	void __iomem		*phy_base;
 
@@ -1198,15 +1197,6 @@ static int imx_pcie_host_init(struct dw_pcie_rp *pp)
 	struct imx_pcie *imx_pcie = to_imx_pcie(pci);
 	int ret;
 
-	if (imx_pcie->vpcie) {
-		ret = regulator_enable(imx_pcie->vpcie);
-		if (ret) {
-			dev_err(dev, "failed to enable vpcie regulator: %d\n",
-				ret);
-			return ret;
-		}
-	}
-
 	if (pp->bridge && imx_check_flag(imx_pcie, IMX_PCIE_FLAG_HAS_LUT)) {
 		pp->bridge->enable_device = imx_pcie_enable_device;
 		pp->bridge->disable_device = imx_pcie_disable_device;
@@ -1222,7 +1212,7 @@ static int imx_pcie_host_init(struct dw_pcie_rp *pp)
 	ret = imx_pcie_clk_enable(imx_pcie);
 	if (ret) {
 		dev_err(dev, "unable to enable pcie clocks: %d\n", ret);
-		goto err_reg_disable;
+		return ret;
 	}
 
 	if (imx_pcie->phy) {
@@ -1269,9 +1259,6 @@ static int imx_pcie_host_init(struct dw_pcie_rp *pp)
 	phy_exit(imx_pcie->phy);
 err_clk_disable:
 	imx_pcie_clk_disable(imx_pcie);
-err_reg_disable:
-	if (imx_pcie->vpcie)
-		regulator_disable(imx_pcie->vpcie);
 	return ret;
 }
 
@@ -1286,9 +1273,6 @@ static void imx_pcie_host_exit(struct dw_pcie_rp *pp)
 		phy_exit(imx_pcie->phy);
 	}
 	imx_pcie_clk_disable(imx_pcie);
-
-	if (imx_pcie->vpcie)
-		regulator_disable(imx_pcie->vpcie);
 }
 
 static void imx_pcie_host_post_init(struct dw_pcie_rp *pp)
@@ -1739,12 +1723,9 @@ static int imx_pcie_probe(struct platform_device *pdev)
 	pci->max_link_speed = 1;
 	of_property_read_u32(node, "fsl,max-link-speed", &pci->max_link_speed);
 
-	imx_pcie->vpcie = devm_regulator_get_optional(&pdev->dev, "vpcie");
-	if (IS_ERR(imx_pcie->vpcie)) {
-		if (PTR_ERR(imx_pcie->vpcie) != -ENODEV)
-			return PTR_ERR(imx_pcie->vpcie);
-		imx_pcie->vpcie = NULL;
-	}
+	ret = devm_regulator_get_enable_optional(&pdev->dev, "vpcie");
+	if (ret < 0 && ret != -ENODEV)
+		return dev_err_probe(dev, ret, "failed to enable vpcie");
 
 	imx_pcie->vph = devm_regulator_get_optional(&pdev->dev, "vph");
 	if (IS_ERR(imx_pcie->vph)) {
-- 
2.37.1
Re: [PATCH v2] PCI: imx6: Enable the vpcie regulator when fetch it
Posted by Manivannan Sadhasivam 5 months, 4 weeks ago 
On Thu, Jun 19, 2025 at 03:24:38PM GMT, Richard Zhu wrote:
> Enable the vpcie regulator at probe time and keep it enabled for the
> entire PCIe controller lifecycle. This ensures support for outbound
> wake-up mechanism such as WAKE# signaling.

I'm not sure about this part. For supporting WAKE#, Vaux supply has to be
supplied to the endpoint. But here, 'vpcie' looks like the main 3.3V supply. So
keeping it always on to support WAKE#, sounds to me that the component never
enters the D3Cold state. So no WAKE# is required.

- Mani

> 
> Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 27 ++++-----------------------
>  1 file changed, 4 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 5a38cfaf989b..7cab4bcfae56 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -159,7 +159,6 @@ struct imx_pcie {
>  	u32			tx_deemph_gen2_6db;
>  	u32			tx_swing_full;
>  	u32			tx_swing_low;
> -	struct regulator	*vpcie;
>  	struct regulator	*vph;
>  	void __iomem		*phy_base;
>  
> @@ -1198,15 +1197,6 @@ static int imx_pcie_host_init(struct dw_pcie_rp *pp)
>  	struct imx_pcie *imx_pcie = to_imx_pcie(pci);
>  	int ret;
>  
> -	if (imx_pcie->vpcie) {
> -		ret = regulator_enable(imx_pcie->vpcie);
> -		if (ret) {
> -			dev_err(dev, "failed to enable vpcie regulator: %d\n",
> -				ret);
> -			return ret;
> -		}
> -	}
> -
>  	if (pp->bridge && imx_check_flag(imx_pcie, IMX_PCIE_FLAG_HAS_LUT)) {
>  		pp->bridge->enable_device = imx_pcie_enable_device;
>  		pp->bridge->disable_device = imx_pcie_disable_device;
> @@ -1222,7 +1212,7 @@ static int imx_pcie_host_init(struct dw_pcie_rp *pp)
>  	ret = imx_pcie_clk_enable(imx_pcie);
>  	if (ret) {
>  		dev_err(dev, "unable to enable pcie clocks: %d\n", ret);
> -		goto err_reg_disable;
> +		return ret;
>  	}
>  
>  	if (imx_pcie->phy) {
> @@ -1269,9 +1259,6 @@ static int imx_pcie_host_init(struct dw_pcie_rp *pp)
>  	phy_exit(imx_pcie->phy);
>  err_clk_disable:
>  	imx_pcie_clk_disable(imx_pcie);
> -err_reg_disable:
> -	if (imx_pcie->vpcie)
> -		regulator_disable(imx_pcie->vpcie);
>  	return ret;
>  }
>  
> @@ -1286,9 +1273,6 @@ static void imx_pcie_host_exit(struct dw_pcie_rp *pp)
>  		phy_exit(imx_pcie->phy);
>  	}
>  	imx_pcie_clk_disable(imx_pcie);
> -
> -	if (imx_pcie->vpcie)
> -		regulator_disable(imx_pcie->vpcie);
>  }
>  
>  static void imx_pcie_host_post_init(struct dw_pcie_rp *pp)
> @@ -1739,12 +1723,9 @@ static int imx_pcie_probe(struct platform_device *pdev)
>  	pci->max_link_speed = 1;
>  	of_property_read_u32(node, "fsl,max-link-speed", &pci->max_link_speed);
>  
> -	imx_pcie->vpcie = devm_regulator_get_optional(&pdev->dev, "vpcie");
> -	if (IS_ERR(imx_pcie->vpcie)) {
> -		if (PTR_ERR(imx_pcie->vpcie) != -ENODEV)
> -			return PTR_ERR(imx_pcie->vpcie);
> -		imx_pcie->vpcie = NULL;
> -	}
> +	ret = devm_regulator_get_enable_optional(&pdev->dev, "vpcie");
> +	if (ret < 0 && ret != -ENODEV)
> +		return dev_err_probe(dev, ret, "failed to enable vpcie");
>  
>  	imx_pcie->vph = devm_regulator_get_optional(&pdev->dev, "vph");
>  	if (IS_ERR(imx_pcie->vph)) {
> -- 
> 2.37.1
> 

-- 
மணிவண்ணன் சதாசிவம்
Re: [PATCH v2] PCI: imx6: Enable the vpcie regulator when fetch it
Posted by Frank Li 7 months, 3 weeks ago 
On Thu, Jun 19, 2025 at 03:24:38PM +0800, Richard Zhu wrote:
> Enable the vpcie regulator at probe time and keep it enabled for the
> entire PCIe controller lifecycle. This ensures support for outbound
> wake-up mechanism such as WAKE# signaling.
>
> Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>

Reviewed-by: Frank Li <Frank.Li@nxp.com>

> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 27 ++++-----------------------
>  1 file changed, 4 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 5a38cfaf989b..7cab4bcfae56 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -159,7 +159,6 @@ struct imx_pcie {
>  	u32			tx_deemph_gen2_6db;
>  	u32			tx_swing_full;
>  	u32			tx_swing_low;
> -	struct regulator	*vpcie;
>  	struct regulator	*vph;
>  	void __iomem		*phy_base;
>
> @@ -1198,15 +1197,6 @@ static int imx_pcie_host_init(struct dw_pcie_rp *pp)
>  	struct imx_pcie *imx_pcie = to_imx_pcie(pci);
>  	int ret;
>
> -	if (imx_pcie->vpcie) {
> -		ret = regulator_enable(imx_pcie->vpcie);
> -		if (ret) {
> -			dev_err(dev, "failed to enable vpcie regulator: %d\n",
> -				ret);
> -			return ret;
> -		}
> -	}
> -
>  	if (pp->bridge && imx_check_flag(imx_pcie, IMX_PCIE_FLAG_HAS_LUT)) {
>  		pp->bridge->enable_device = imx_pcie_enable_device;
>  		pp->bridge->disable_device = imx_pcie_disable_device;
> @@ -1222,7 +1212,7 @@ static int imx_pcie_host_init(struct dw_pcie_rp *pp)
>  	ret = imx_pcie_clk_enable(imx_pcie);
>  	if (ret) {
>  		dev_err(dev, "unable to enable pcie clocks: %d\n", ret);
> -		goto err_reg_disable;
> +		return ret;
>  	}
>
>  	if (imx_pcie->phy) {
> @@ -1269,9 +1259,6 @@ static int imx_pcie_host_init(struct dw_pcie_rp *pp)
>  	phy_exit(imx_pcie->phy);
>  err_clk_disable:
>  	imx_pcie_clk_disable(imx_pcie);
> -err_reg_disable:
> -	if (imx_pcie->vpcie)
> -		regulator_disable(imx_pcie->vpcie);
>  	return ret;
>  }
>
> @@ -1286,9 +1273,6 @@ static void imx_pcie_host_exit(struct dw_pcie_rp *pp)
>  		phy_exit(imx_pcie->phy);
>  	}
>  	imx_pcie_clk_disable(imx_pcie);
> -
> -	if (imx_pcie->vpcie)
> -		regulator_disable(imx_pcie->vpcie);
>  }
>
>  static void imx_pcie_host_post_init(struct dw_pcie_rp *pp)
> @@ -1739,12 +1723,9 @@ static int imx_pcie_probe(struct platform_device *pdev)
>  	pci->max_link_speed = 1;
>  	of_property_read_u32(node, "fsl,max-link-speed", &pci->max_link_speed);
>
> -	imx_pcie->vpcie = devm_regulator_get_optional(&pdev->dev, "vpcie");
> -	if (IS_ERR(imx_pcie->vpcie)) {
> -		if (PTR_ERR(imx_pcie->vpcie) != -ENODEV)
> -			return PTR_ERR(imx_pcie->vpcie);
> -		imx_pcie->vpcie = NULL;
> -	}
> +	ret = devm_regulator_get_enable_optional(&pdev->dev, "vpcie");
> +	if (ret < 0 && ret != -ENODEV)
> +		return dev_err_probe(dev, ret, "failed to enable vpcie");
>
>  	imx_pcie->vph = devm_regulator_get_optional(&pdev->dev, "vph");
>  	if (IS_ERR(imx_pcie->vph)) {
> --
> 2.37.1
>

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