linux-kernel - [PATCH v2 2/5] PCI: imx6: Add the error propagation from host

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Date:   Mon, 13 Sep 2021 13:41:07 +0800
From:   Richard Zhu <hongxing.zhu@....com>
To:     l.stach@...gutronix.de, bhelgaas@...gle.com,
        lorenzo.pieralisi@....com
Cc:     linux-pci@...r.kernel.org, linux-imx@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de, Richard Zhu <hongxing.zhu@....com>
Subject: [PATCH v2 2/5] PCI: imx6: Add the error propagation from host_init

Since there is error return check of the host_init callback, add error
check to imx6_pcie_deassert_core_reset() function, and change the
function type accordingly.

Signed-off-by: Richard Zhu <hongxing.zhu@....com>
---
 drivers/pci/controller/dwc/pci-imx6.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 64260b91c474..d3479f646c4f 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -527,24 +527,24 @@ static void imx7d_pcie_wait_for_phy_pll_lock(struct imx6_pcie *imx6_pcie)
 		dev_err(dev, "PCIe PLL lock timeout\n");
 }
 
-static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
+static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
 {
 	struct dw_pcie *pci = imx6_pcie->pci;
 	struct device *dev = pci->dev;
-	int ret;
+	int ret, err;
 
 	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;
+			return ret;
 		}
 	}
 
-	ret = imx6_pcie_clk_enable(imx6_pcie);
-	if (ret) {
-		dev_err(dev, "unable to enable pcie clocks\n");
+	err = imx6_pcie_clk_enable(imx6_pcie);
+	if (err) {
+		dev_err(dev, "unable to enable pcie clocks: %d\n", err);
 		goto err_clks;
 	}
 
@@ -599,7 +599,7 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
 		break;
 	}
 
-	return;
+	return 0;
 
 err_clks:
 	if (imx6_pcie->vpcie && regulator_is_enabled(imx6_pcie->vpcie) > 0) {
@@ -608,6 +608,7 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
 			dev_err(dev, "failed to disable vpcie regulator: %d\n",
 				ret);
 	}
+	return err;
 }
 
 static void imx6_pcie_configure_type(struct imx6_pcie *imx6_pcie)
@@ -858,11 +859,18 @@ static int imx6_pcie_start_link(struct dw_pcie *pci)
 static int imx6_pcie_host_init(struct pcie_port *pp)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct device *dev = pci->dev;
 	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
+	int ret;
 
 	imx6_pcie_assert_core_reset(imx6_pcie);
 	imx6_pcie_init_phy(imx6_pcie);
-	imx6_pcie_deassert_core_reset(imx6_pcie);
+	ret = imx6_pcie_deassert_core_reset(imx6_pcie);
+	if (ret < 0) {
+		dev_err(dev, "pcie host init failed: %d.\n", ret);
+		return ret;
+	}
+
 	imx6_setup_phy_mpll(imx6_pcie);
 
 	return 0;
-- 
2.25.1