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    Subject[PATCH v8 7/9] PCI: mediatek: Add system PM support for MT2712 and MT7622
    Date
    From: Honghui Zhang <honghui.zhang@mediatek.com>

    In order to reduce the PCIe power consuming while system suspend,
    the physical layer should be gated. And the PCIe link should be
    re-established and the related control register values should be
    re-initialized after system resume.

    Register suspend_noirq & resume_noirq callback functions to allow
    PCIe to come up after resume from RAM.

    Signed-off-by: Honghui Zhang <honghui.zhang@mediatek.com>
    Acked-by: Ryder Lee <ryder.lee@mediatek.com>
    ---
    drivers/pci/controller/pcie-mediatek.c | 50 ++++++++++++++++++++++++++++++++++
    1 file changed, 50 insertions(+)

    diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
    index d3f4694..42cf2a4 100644
    --- a/drivers/pci/controller/pcie-mediatek.c
    +++ b/drivers/pci/controller/pcie-mediatek.c
    @@ -1168,6 +1168,55 @@ static int mtk_pcie_probe(struct platform_device *pdev)
    return err;
    }

    +static int __maybe_unused mtk_pcie_suspend_noirq(struct device *dev)
    +{
    + struct mtk_pcie *pcie = dev_get_drvdata(dev);
    + struct mtk_pcie_port *port;
    +
    + if (list_empty(&pcie->ports))
    + return 0;
    +
    + list_for_each_entry(port, &pcie->ports, list) {
    + clk_disable_unprepare(port->pipe_ck);
    + clk_disable_unprepare(port->obff_ck);
    + clk_disable_unprepare(port->axi_ck);
    + clk_disable_unprepare(port->aux_ck);
    + clk_disable_unprepare(port->ahb_ck);
    + clk_disable_unprepare(port->sys_ck);
    + phy_power_off(port->phy);
    + phy_exit(port->phy);
    + }
    +
    + clk_disable_unprepare(pcie->free_ck);
    +
    + return 0;
    +}
    +
    +static int __maybe_unused mtk_pcie_resume_noirq(struct device *dev)
    +{
    + struct mtk_pcie *pcie = dev_get_drvdata(dev);
    + struct mtk_pcie_port *port, *tmp;
    +
    + if (list_empty(&pcie->ports))
    + return 0;
    +
    + clk_prepare_enable(pcie->free_ck);
    +
    + list_for_each_entry_safe(port, tmp, &pcie->ports, list)
    + mtk_pcie_enable_port(port);
    +
    + /* In case of EP was removed while system suspend. */
    + if (list_empty(&pcie->ports))
    + clk_disable_unprepare(pcie->free_ck);
    +
    + return 0;
    +}
    +
    +static const struct dev_pm_ops mtk_pcie_pm_ops = {
    + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_pcie_suspend_noirq,
    + mtk_pcie_resume_noirq)
    +};
    +
    static const struct mtk_pcie_soc mtk_pcie_soc_v1 = {
    .ops = &mtk_pcie_ops,
    .startup = mtk_pcie_startup_port,
    @@ -1200,6 +1249,7 @@ static struct platform_driver mtk_pcie_driver = {
    .name = "mtk-pcie",
    .of_match_table = mtk_pcie_ids,
    .suppress_bind_attrs = true,
    + .pm = &mtk_pcie_pm_ops,
    },
    };
    builtin_platform_driver(mtk_pcie_driver);
    --
    2.6.4
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