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    Subject[PATCH v3 07/15] PCI: aardvark: Add suspend to RAM support
    Date
    Add suspend and resume callbacks. The priority of these are
    "_noirq()", to workaround early access to the registers done by the
    PCI core through the ->read()/->write() callbacks at resume time.

    Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
    ---
    drivers/pci/controller/pci-aardvark.c | 45 ++++++++++++++++++++++++++-
    1 file changed, 44 insertions(+), 1 deletion(-)

    diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
    index 3fb14e37eb59..999bbe27761a 100644
    --- a/drivers/pci/controller/pci-aardvark.c
    +++ b/drivers/pci/controller/pci-aardvark.c
    @@ -1028,7 +1028,7 @@ static int advk_pcie_setup_clk(struct advk_pcie *pcie)
    return ret;
    }

    -static void __maybe_unused advk_pcie_disable_phy(struct advk_pcie *pcie)
    +static void advk_pcie_disable_phy(struct advk_pcie *pcie)
    {
    phy_power_off(pcie->phy);
    phy_exit(pcie->phy);
    @@ -1119,6 +1119,47 @@ static int advk_pcie_setup_reset_gpio(struct advk_pcie *pcie)
    return 0;
    }

    +static int __maybe_unused advk_pcie_suspend(struct device *dev)
    +{
    + struct advk_pcie *pcie = dev_get_drvdata(dev);
    +
    + advk_pcie_disable_phy(pcie);
    +
    + clk_disable_unprepare(pcie->clk);
    +
    + return 0;
    +}
    +
    +static int __maybe_unused advk_pcie_resume(struct device *dev)
    +{
    + struct advk_pcie *pcie = dev_get_drvdata(dev);
    + int ret;
    +
    + ret = clk_prepare_enable(pcie->clk);
    + if (ret)
    + return ret;
    +
    + ret = advk_pcie_enable_phy(pcie);
    + if (ret)
    + return ret;
    +
    + advk_pcie_setup_hw(pcie);
    +
    + advk_sw_pci_bridge_init(pcie);
    +
    + return 0;
    +}
    +
    +/*
    + * The PCI core will try to reconfigure the bus quite early in the resume path.
    + * We must use the _noirq() alternatives to ensure the controller is ready when
    + * the core uses the ->read()/->write() callbacks.
    + */
    +static const struct dev_pm_ops advk_pcie_dev_pm_ops = {
    + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(advk_pcie_suspend,
    + advk_pcie_resume)
    +};
    +
    static int advk_pcie_probe(struct platform_device *pdev)
    {
    struct device *dev = &pdev->dev;
    @@ -1133,6 +1174,7 @@ static int advk_pcie_probe(struct platform_device *pdev)

    pcie = pci_host_bridge_priv(bridge);
    pcie->pdev = pdev;
    + platform_set_drvdata(pdev, pcie);

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    pcie->base = devm_ioremap_resource(dev, res);
    @@ -1210,6 +1252,7 @@ static struct platform_driver advk_pcie_driver = {
    .driver = {
    .name = "advk-pcie",
    .of_match_table = advk_pcie_of_match_table,
    + .pm = &advk_pcie_dev_pm_ops,
    /* Driver unloading/unbinding currently not supported */
    .suppress_bind_attrs = true,
    },
    --
    2.19.1
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