linux-kernel - [PATCH v13 14/15] PCI: imx6: Do not hide phy driver callbacks and refine the error handling

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Date:   Fri, 17 Jun 2022 18:31:13 +0800
From:   Richard Zhu <hongxing.zhu@....com>
To:     l.stach@...gutronix.de, bhelgaas@...gle.com, robh+dt@...nel.org,
        broonie@...nel.org, lorenzo.pieralisi@....com, festevam@...il.com,
        francesco.dolcini@...adex.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 v13 14/15] PCI: imx6: Do not hide phy driver callbacks and refine the error handling

- Move the phy_power_on() to host_init and resume functions from
  imx6_pcie_clk_enable().
- Move the phy_init() to host_init and resume functions from
  imx6_pcie_deassert_core_reset().

Refine the error handling in imx6_pcie_host_init() accordingly.

Signed-off-by: Richard Zhu <hongxing.zhu@....com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
 drivers/pci/controller/dwc/pci-imx6.c | 35 +++++++++++++++++----------
 1 file changed, 22 insertions(+), 13 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index abce427f5d3f..363bfc4742cf 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -639,14 +639,6 @@ static int imx6_pcie_clk_enable(struct imx6_pcie *imx6_pcie)
 		goto err_ref_clk;
 	}
 
-	switch (imx6_pcie->drvdata->variant) {
-	case IMX8MM:
-		if (phy_power_on(imx6_pcie->phy))
-			dev_err(dev, "unable to power on PHY\n");
-		break;
-	default:
-		break;
-	}
 	/* allow the clocks to stabilize */
 	usleep_range(200, 500);
 	return 0;
@@ -723,10 +715,6 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
 	case IMX8MQ:
 		reset_control_deassert(imx6_pcie->pciephy_reset);
 		break;
-	case IMX8MM:
-		if (phy_init(imx6_pcie->phy))
-			dev_err(dev, "waiting for phy ready timeout!\n");
-		break;
 	case IMX7D:
 		reset_control_deassert(imx6_pcie->pciephy_reset);
 
@@ -762,6 +750,7 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
 		usleep_range(200, 500);
 		break;
 	case IMX6Q:		/* Nothing to do */
+	case IMX8MM:
 		break;
 	}
 
@@ -904,12 +893,20 @@ static int imx6_pcie_host_init(struct pcie_port *pp)
 
 	imx6_pcie_assert_core_reset(imx6_pcie);
 	imx6_pcie_init_phy(imx6_pcie);
+	if (imx6_pcie->phy) {
+		ret = phy_power_on(imx6_pcie->phy);
+		if (ret) {
+			dev_err(dev, "pcie phy power up failed.\n");
+			return 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;
+			goto err_phy_off;
 		}
 	}
 
@@ -919,13 +916,25 @@ static int imx6_pcie_host_init(struct pcie_port *pp)
 		goto err_reg_disable;
 	}
 
+	if (imx6_pcie->phy) {
+		ret = phy_init(imx6_pcie->phy);
+		if (ret) {
+			dev_err(dev, "waiting for phy ready timeout!\n");
+			goto err_phy_init;
+		}
+	}
 	imx6_setup_phy_mpll(imx6_pcie);
 
 	return 0;
 
+err_phy_init:
+	imx6_pcie_clk_disable(imx6_pcie);
 err_reg_disable:
 	if (imx6_pcie->vpcie)
 		regulator_disable(imx6_pcie->vpcie);
+err_phy_off:
+	if (imx6_pcie->phy)
+		phy_power_off(imx6_pcie->phy);
 	return ret;
 }
 
-- 
2.25.1