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To let i.MX95 PCIe PM work fine, save and restore the LUT setting in suspend and resume operations. Signed-off-by: Richard Zhu --- drivers/pci/controller/dwc/pci-imx6.c | 47 +++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 1c8834fbcfd5..dc98a04c2956 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -137,6 +137,11 @@ struct imx_pcie_drvdata { const struct dw_pcie_host_ops *ops; }; +struct imx_lut_data { + u32 data1; + u32 data2; +}; + struct imx_pcie { struct dw_pcie *pci; struct gpio_desc *reset_gpiod; @@ -156,6 +161,8 @@ struct imx_pcie { struct regulator *vph; void __iomem *phy_base; + /* LUT data for pcie */ + struct imx_lut_data luts[IMX95_MAX_LUT]; /* power domain for pcie */ struct device *pd_pcie; /* power domain for pcie phy */ @@ -1507,6 +1514,42 @@ static void imx_pcie_msi_save_restore(struct imx_pcie *imx_pcie, bool save) } } +static void imx_pcie_lut_save(struct imx_pcie *imx_pcie) +{ + u32 data1, data2; + int i; + + for (i = 0; i < IMX95_MAX_LUT; i++) { + regmap_write(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_ACSCTRL, + IMX95_PEO_LUT_RWA | i); + regmap_read(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_DATA1, &data1); + regmap_read(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_DATA2, &data2); + if (data1 & IMX95_PE0_LUT_VLD) { + imx_pcie->luts[i].data1 = data1; + imx_pcie->luts[i].data2 = data2; + } else { + imx_pcie->luts[i].data1 = 0; + imx_pcie->luts[i].data2 = 0; + } + } +} + +static void imx_pcie_lut_restore(struct imx_pcie *imx_pcie) +{ + int i; + + for (i = 0; i < IMX95_MAX_LUT; i++) { + if ((imx_pcie->luts[i].data1 & IMX95_PE0_LUT_VLD) == 0) + continue; + + regmap_write(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_DATA1, + imx_pcie->luts[i].data1); + regmap_write(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_DATA2, + imx_pcie->luts[i].data2); + regmap_write(imx_pcie->iomuxc_gpr, IMX95_PE0_LUT_ACSCTRL, i); + } +} + static int imx_pcie_suspend_noirq(struct device *dev) { struct imx_pcie *imx_pcie = dev_get_drvdata(dev); @@ -1515,6 +1558,8 @@ static int imx_pcie_suspend_noirq(struct device *dev) return 0; imx_pcie_msi_save_restore(imx_pcie, true); + if (imx_check_flag(imx_pcie, IMX_PCIE_FLAG_HAS_LUT)) + imx_pcie_lut_save(imx_pcie); if (imx_check_flag(imx_pcie, IMX_PCIE_FLAG_BROKEN_SUSPEND)) { /* * The minimum for a workaround would be to set PERST# and to @@ -1559,6 +1604,8 @@ static int imx_pcie_resume_noirq(struct device *dev) if (ret) return ret; } + if (imx_check_flag(imx_pcie, IMX_PCIE_FLAG_HAS_LUT)) + imx_pcie_lut_restore(imx_pcie); imx_pcie_msi_save_restore(imx_pcie, false); return 0;