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| author | Phil Edworthy <phil.edworthy@renesas.com> | 2016-01-05 13:00:30 +0000 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-01-11 08:46:33 -0600 |
| commit | de1be9a8897cb35bee7617da8b6ddd7d144db332 (patch) | |
| tree | cea15b01e0b6a768f48b9b61d570443be881fdc7 /drivers/pci | |
| parent | 049f419399e937e333bf121b7b234888d804a25e (diff) | |
| download | linux-de1be9a8897cb35bee7617da8b6ddd7d144db332.tar.gz linux-de1be9a8897cb35bee7617da8b6ddd7d144db332.tar.bz2 linux-de1be9a8897cb35bee7617da8b6ddd7d144db332.zip | |
PCI: rcar: Add runtime PM support to pcie-rcar
If runtime PM is enabled in the kernel config, simply enable the clocks
once during probe.
Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/host/pcie-rcar.c | 44 |
1 files changed, 32 insertions, 12 deletions
diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index c72c0ae31feb..f157b50ee42b 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -26,6 +26,7 @@ #include <linux/of_platform.h> #include <linux/pci.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/slab.h> #define DRV_NAME "rcar-pcie" @@ -994,32 +995,51 @@ static int rcar_pcie_probe(struct platform_device *pdev) if (err) return err; - if (IS_ENABLED(CONFIG_PCI_MSI)) { - err = rcar_pcie_enable_msi(pcie); - if (err < 0) { - dev_err(&pdev->dev, - "failed to enable MSI support: %d\n", - err); - return err; - } - } - of_id = of_match_device(rcar_pcie_of_match, pcie->dev); if (!of_id || !of_id->data) return -EINVAL; hw_init_fn = of_id->data; + pm_runtime_enable(pcie->dev); + err = pm_runtime_get_sync(pcie->dev); + if (err < 0) { + dev_err(pcie->dev, "pm_runtime_get_sync failed\n"); + goto err_pm_disable; + } + /* Failure to get a link might just be that no cards are inserted */ err = hw_init_fn(pcie); if (err) { dev_info(&pdev->dev, "PCIe link down\n"); - return 0; + err = 0; + goto err_pm_put; } data = rcar_pci_read_reg(pcie, MACSR); dev_info(&pdev->dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f); - return rcar_pcie_enable(pcie); + if (IS_ENABLED(CONFIG_PCI_MSI)) { + err = rcar_pcie_enable_msi(pcie); + if (err < 0) { + dev_err(&pdev->dev, + "failed to enable MSI support: %d\n", + err); + goto err_pm_put; + } + } + + err = rcar_pcie_enable(pcie); + if (err) + goto err_pm_put; + + return 0; + +err_pm_put: + pm_runtime_put(pcie->dev); + +err_pm_disable: + pm_runtime_disable(pcie->dev); + return err; } static struct platform_driver rcar_pcie_driver = { |