[PATCH v4 1/6] PCI: rcar: Pull bus clock enable/disable from rcar_pcie_get_resources()

[Marek Vasut]

The rcar_pcie_get_resources() is another misnomer with a side effect.
The function does not only get resources, but also enables/disables bus
clock. This is forgotten in the probe() function though and if anything
in probe() fails after rcar_pcie_get_resources() is called, the bus
clock are never disabled.

This patch pulls the clock handling out of the rcar_pcie_get_resources()
and enables clock after all the resources were requested. Moreover, this
patch also always disables the clock in case of failure.

Signed-off-by: Marek Vasut <marek.vasut+rene...@gmail.com>
Cc: Geert Uytterhoeven <geert+rene...@glider.be>
Cc: Lorenzo Pieralisi <lorenzo.pieral...@arm.com>
Cc: Phil Edworthy <phil.edwor...@renesas.com>
Cc: Simon Horman <horms+rene...@verge.net.au>
Cc: Wolfram Sang <w...@the-dreams.de>
Cc: linux-renesas-soc@vger.kernel.org
---
V2: No change
V3: No change
V4: Rebase on top of Lorenzo's pci/rcar, fix up the rebase breakage
    induced by patches therein
---
 drivers/pci/host/pcie-rcar.c | 33 ++++++++++++++++-----------------
 1 file changed, 16 insertions(+), 17 deletions(-)

diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c
index 8d161563bce8..0879880f7975 100644
--- a/drivers/pci/host/pcie-rcar.c
+++ b/drivers/pci/host/pcie-rcar.c
@@ -946,32 +946,22 @@ static int rcar_pcie_get_resources(struct rcar_pcie *pcie)
                dev_err(dev, "cannot get pcie bus clock\n");
                return PTR_ERR(pcie->bus_clk);
        }
-       err = clk_prepare_enable(pcie->bus_clk);
-       if (err)
-               return err;
 
        i = irq_of_parse_and_map(dev->of_node, 0);
        if (!i) {
                dev_err(dev, "cannot get platform resources for msi 
interrupt\n");
-               err = -ENOENT;
-               goto err_map_reg;
+               return -ENOENT;
        }
        pcie->msi.irq1 = i;
 
        i = irq_of_parse_and_map(dev->of_node, 1);
        if (!i) {
                dev_err(dev, "cannot get platform resources for msi 
interrupt\n");
-               err = -ENOENT;
-               goto err_map_reg;
+               return -ENOENT;
        }
        pcie->msi.irq2 = i;
 
        return 0;
-
-err_map_reg:
-       clk_disable_unprepare(pcie->bus_clk);
-
-       return err;
 }
 
 static int rcar_pcie_inbound_ranges(struct rcar_pcie *pcie,
@@ -1115,22 +1105,28 @@ static int rcar_pcie_probe(struct platform_device *pdev)
                goto err_pm_put;
        }
 
+       err = clk_prepare_enable(pcie->bus_clk);
+       if (err) {
+               dev_err(dev, "failed to enable bus clock: %d\n", err);
+               goto err_pm_put;
+       }
+
        err = rcar_pcie_parse_map_dma_ranges(pcie, dev->of_node);
        if (err)
-               goto err_pm_put;
+               goto err_clk_disable;
 
        phy_init_fn = of_device_get_match_data(dev);
        err = phy_init_fn(pcie);
        if (err) {
                dev_err(dev, "failed to init PCIe PHY\n");
-               goto err_pm_put;
+               goto err_clk_disable;
        }
 
        /* Failure to get a link might just be that no cards are inserted */
        if (rcar_pcie_hw_init(pcie)) {
                dev_info(dev, "PCIe link down\n");
                err = -ENODEV;
-               goto err_pm_put;
+               goto err_clk_disable;
        }
 
        data = rcar_pci_read_reg(pcie, MACSR);
@@ -1142,16 +1138,19 @@ static int rcar_pcie_probe(struct platform_device *pdev)
                        dev_err(dev,
                                "failed to enable MSI support: %d\n",
                                err);
-                       goto err_pm_put;
+                       goto err_clk_disable;
                }
        }
 
        err = rcar_pcie_enable(pcie);
        if (err)
-               goto err_pm_put;
+               goto err_clk_disable;
 
        return 0;
 
+err_clk_disable:
+       clk_disable_unprepare(pcie->bus_clk);
+
 err_pm_put:
        pm_runtime_put(dev);
 
-- 
2.16.2