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PCI: mediatek: Add system PM support for MT2712 and MT7622

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In order to reduce the PCIe power consumption in system suspend,
the PCI bus physical layer should be gated. On system resume, the PCIe
link should be re-established and the related control register values
should be restored.

Define suspend_noirq & resume_noirq callback functions to implement
PM system syspend hooks for the PCI host controller.

Signed-off-by: Honghui Zhang <honghui.zhang@mediatek.com>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Ryder Lee <ryder.lee@mediatek.com>
This commit is contained in:
Honghui Zhang 2018-10-15 16:08:58 +08:00 committed by Lorenzo Pieralisi
parent 3828d60fd2
commit 97d2932fee
1 changed files with 50 additions and 0 deletions
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50
drivers/pci/controller/pcie-mediatek.c
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@ -1168,6 +1168,55 @@ put_resources:
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);