diff options
Diffstat (limited to 'drivers/pci/controller/dwc/pci-imx6.c')
| -rw-r--r-- | drivers/pci/controller/dwc/pci-imx6.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 52906f999f2b..27aaa2a6bf39 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -80,6 +80,7 @@ struct imx6_pcie { struct clk *pcie; struct clk *pcie_aux; struct regmap *iomuxc_gpr; + u16 msi_ctrl; u32 controller_id; struct reset_control *pciephy_reset; struct reset_control *apps_reset; @@ -1178,6 +1179,26 @@ pm_turnoff_sleep: usleep_range(1000, 10000); } +static void imx6_pcie_msi_save_restore(struct imx6_pcie *imx6_pcie, bool save) +{ + u8 offset; + u16 val; + struct dw_pcie *pci = imx6_pcie->pci; + + if (pci_msi_enabled()) { + offset = dw_pcie_find_capability(pci, PCI_CAP_ID_MSI); + if (save) { + val = dw_pcie_readw_dbi(pci, offset + PCI_MSI_FLAGS); + imx6_pcie->msi_ctrl = val; + } else { + dw_pcie_dbi_ro_wr_en(pci); + val = imx6_pcie->msi_ctrl; + dw_pcie_writew_dbi(pci, offset + PCI_MSI_FLAGS, val); + dw_pcie_dbi_ro_wr_dis(pci); + } + } +} + static int imx6_pcie_suspend_noirq(struct device *dev) { struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev); @@ -1186,6 +1207,7 @@ static int imx6_pcie_suspend_noirq(struct device *dev) if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_SUPPORTS_SUSPEND)) return 0; + imx6_pcie_msi_save_restore(imx6_pcie, true); imx6_pcie_pm_turnoff(imx6_pcie); imx6_pcie_stop_link(imx6_pcie->pci); imx6_pcie_host_exit(pp); @@ -1205,6 +1227,7 @@ static int imx6_pcie_resume_noirq(struct device *dev) ret = imx6_pcie_host_init(pp); if (ret) return ret; + imx6_pcie_msi_save_restore(imx6_pcie, false); dw_pcie_setup_rc(pp); if (imx6_pcie->link_is_up) |