linux-kernel - [PATCH v1] PCI: imx6: Keep the GPIO regulator always on

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Date:   Thu,  3 Nov 2022 14:08:18 +0800
From:   Richard Zhu <hongxing.zhu@....com>
To:     l.stach@...gutronix.de, bhelgaas@...gle.com,
        lorenzo.pieralisi@....com
Cc:     hongxing.zhu@....com, linux-pci@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de, linux-imx@....com
Subject: [PATCH v1] PCI: imx6: Keep the GPIO regulator always on

Since vpcie regulator is one GPIO regulator, used to control the
VPCIe_3V3 and power up remote PCIe EP device.

Some WIFI modules load their firmware once in probe, and can't be
powered off during suspend. Otherwise, these WIFI modules wouldn't be
functional anymore after resume back.

So, keep this regulator always on in the probe.

Fixes: a4bb720eeb1e ("PCI: imx6: Turn off regulator when system is in suspend mode")
Signed-off-by: Richard Zhu <hongxing.zhu@....com>
---
 drivers/pci/controller/dwc/pci-imx6.c | 24 ++++++++----------------
 1 file changed, 8 insertions(+), 16 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 2616585ca5f8..94a89bbf381d 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -926,22 +926,13 @@ static int imx6_pcie_host_init(struct dw_pcie_rp *pp)
 	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
 	int ret;
 
-	if (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_assert_core_reset(imx6_pcie);
 	imx6_pcie_init_phy(imx6_pcie);
 
 	ret = imx6_pcie_clk_enable(imx6_pcie);
 	if (ret) {
 		dev_err(dev, "unable to enable pcie clocks: %d\n", ret);
-		goto err_reg_disable;
+		return ret;
 	}
 
 	if (imx6_pcie->phy) {
@@ -974,9 +965,6 @@ static int imx6_pcie_host_init(struct dw_pcie_rp *pp)
 		phy_exit(imx6_pcie->phy);
 err_clk_disable:
 	imx6_pcie_clk_disable(imx6_pcie);
-err_reg_disable:
-	if (imx6_pcie->vpcie)
-		regulator_disable(imx6_pcie->vpcie);
 	return ret;
 }
 
@@ -991,9 +979,6 @@ static void imx6_pcie_host_exit(struct dw_pcie_rp *pp)
 		phy_exit(imx6_pcie->phy);
 	}
 	imx6_pcie_clk_disable(imx6_pcie);
-
-	if (imx6_pcie->vpcie)
-		regulator_disable(imx6_pcie->vpcie);
 }
 
 static const struct dw_pcie_host_ops imx6_pcie_host_ops = {
@@ -1263,6 +1248,13 @@ static int imx6_pcie_probe(struct platform_device *pdev)
 		if (PTR_ERR(imx6_pcie->vpcie) != -ENODEV)
 			return PTR_ERR(imx6_pcie->vpcie);
 		imx6_pcie->vpcie = NULL;
+	} else {
+		ret = regulator_enable(imx6_pcie->vpcie);
+		if (ret) {
+			dev_err(dev, "failed to enable vpcie regulator: %d\n",
+				ret);
+			return ret;
+		}
 	}
 
 	imx6_pcie->vph = devm_regulator_get_optional(&pdev->dev, "vph");
-- 
2.25.1