[PATCH v7 7/9] PCI: mediatek: Add system PM support for MT2712 and MT7622
From: honghui.zhang at mediatek.com <hidden>
Date: 2018-10-15 05:45:03
Also in:
linux-devicetree, linux-mediatek, linux-pci, lkml
Subsystem:
pci native host bridge and endpoint drivers, pci subsystem, pcie driver for mediatek, the rest · Maintainers:
Lorenzo Pieralisi, Krzysztof Wilczyński, Manivannan Sadhasivam, Bjorn Helgaas, Ryder Lee, Linus Torvalds
From: Honghui Zhang <redacted> 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 <redacted> --- 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);
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2.6.4