On Thu, 2018-05-31 at 10:05 +0800, Ryder Lee wrote:
> On Wed, 2018-05-30 at 10:35 +0800, honghui.zhang@xxxxxxxxxxxx wrote:
> > From: Honghui Zhang <honghui.zhang@xxxxxxxxxxxx>
> >
> > The MTCMOS of PCIe Host for MT2712 will be off when system suspend, and all
> > the internel control register will be reset after system resume. The PCIe
> > link should be re-established and the related control register values should
> > be re-set after system resume.
> >
> > Signed-off-by: Honghui Zhang <honghui.zhang@xxxxxxxxxxxx>
> > CC: Ryder Lee <ryder.lee@xxxxxxxxxxxx>
> > ---
> > drivers/pci/host/pcie-mediatek.c | 82 ++++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 82 insertions(+)
> >
> > diff --git a/drivers/pci/host/pcie-mediatek.c b/drivers/pci/host/pcie-mediatek.c
> > index dabf1086..60f98d92 100644
> > --- a/drivers/pci/host/pcie-mediatek.c
> > +++ b/drivers/pci/host/pcie-mediatek.c
> > @@ -132,12 +132,14 @@ struct mtk_pcie_port;
> > /**
> > * struct mtk_pcie_soc - differentiate between host generations
> > * @need_fix_class_id: whether this host's class ID needed to be fixed or not
> > + * @pm_support: whether the host's MTCMOS will be off when suspend
> > * @ops: pointer to configuration access functions
> > * @startup: pointer to controller setting functions
> > * @setup_irq: pointer to initialize IRQ functions
> > */
> > struct mtk_pcie_soc {
> > bool need_fix_class_id;
> > + bool pm_support;
> > struct pci_ops *ops;
> > int (*startup)(struct mtk_pcie_port *port);
> > int (*setup_irq)(struct mtk_pcie_port *port, struct device_node *node);
> > @@ -1179,12 +1181,91 @@ static int mtk_pcie_probe(struct platform_device *pdev)
> > return err;
> > }
> >
> > +static int __maybe_unused mtk_pcie_suspend_noirq(struct device *dev)
> > +{
> > + struct platform_device *pdev;
> > + struct mtk_pcie *pcie;
> > + struct mtk_pcie_port *port;
> > + const struct mtk_pcie_soc *soc;
> > +
> > + pdev = to_platform_device(dev);
> > + pcie = platform_get_drvdata(pdev);
>
> How about this -
> struct mtk_pcie *pcie = dev_get_drvdata(dev);
Yes, I forgot that, thanks very much for your reminder.
>
> > + soc = pcie->soc;
> > + if (!soc->pm_support)
> > + return 0;
> > +
> > + list_for_each_entry(port, &pcie->ports, list) {
> > + clk_disable_unprepare(port->ahb_ck);
> > + clk_disable_unprepare(port->sys_ck);
> > + phy_power_off(port->phy);
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int __maybe_unused mtk_pcie_resume_noirq(struct device *dev)
> > +{
> > + struct platform_device *pdev;
> > + struct mtk_pcie *pcie;
> > + struct mtk_pcie_port *port;
> > + const struct mtk_pcie_soc *soc;
> > + int ret;
> > +
> > + pdev = to_platform_device(dev);
> > + pcie = platform_get_drvdata(pdev);
>
> struct mtk_pcie *pcie = dev_get_drvdata(dev);
thanks.
>
> > + soc = pcie->soc;
> > + if (!soc->pm_support)
> > + return 0;
> > +
> > + list_for_each_entry(port, &pcie->ports, list) {
> > + ret = phy_power_on(port->phy);
> > + if (ret) {
> > + dev_err(dev, "could not power on phy\n");
> > + return ret;
> > + }
> > + ret = clk_prepare_enable(port->sys_ck);
> > + if (ret) {
> > + dev_err(dev, "enable sys clock error\n");
> > + phy_power_off(port->phy);
> > + return ret;
> > + }
> > +
> > + ret = clk_prepare_enable(port->ahb_ck);
> > + if (ret) {
> > + dev_err(dev, "enable ahb clock error\n");
> > + phy_power_off(port->phy);
> > + clk_disable_unprepare(port->sys_ck);
> > + return ret;
> > + }
> > +
> > + ret = soc->startup(port);
> > + if (ret) {
> > + dev_err(dev, "pcie linkup failed\n");
> > + phy_power_off(port->phy);
> > + clk_disable_unprepare(port->sys_ck);
> > + clk_disable_unprepare(port->ahb_ck);
> > + return ret;
> > + }
> > +
> > + if (IS_ENABLED(CONFIG_PCI_MSI))
> > + mtk_pcie_enable_msi(port);
> > + }
> > +
> > + return 0;
> > +}
> > +
>
>
>
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