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Merge branch 'remotes/lorenzo/pci/imx6'

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- Allow host controller driver to probe successfully (as other drivers do)
  even if link is currently down (Fabio Estevam)

- Enable i.MX6QP PCIe power management (Richard Zhu)

- Invoke PHY exit function after PHY power off (Richard Zhu)

- Assert i.MX8MM CLKREQ# even if no device present to avoid boot hangs
  (Richard Zhu)

* remotes/lorenzo/pci/imx6:
  PCI: imx6: Assert i.MX8MM CLKREQ# even if no device present
  PCI: imx6: Invoke the PHY exit function after PHY power off
  PCI: imx6: Enable i.MX6QP PCIe power management support
  PCI: imx6: Allow to probe when dw_pcie_wait_for_link() fails
This commit is contained in:
Bjorn Helgaas 2022-03-22 17:16:24 -05:00
commit f409855492
1 changed files with 6 additions and 13 deletions
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19
drivers/pci/controller/dwc/pci-imx6.c
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@ -453,10 +453,6 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
case IMX7D:
break;
case IMX8MM:
ret = clk_prepare_enable(imx6_pcie->pcie_aux);
if (ret)
dev_err(dev, "unable to enable pcie_aux clock\n");
break;
case IMX8MQ:
ret = clk_prepare_enable(imx6_pcie->pcie_aux);
if (ret) {
@ -809,9 +805,7 @@ static int imx6_pcie_start_link(struct dw_pcie *pci)
/* Start LTSSM. */
imx6_pcie_ltssm_enable(dev);
ret = dw_pcie_wait_for_link(pci);
if (ret)
goto err_reset_phy;
dw_pcie_wait_for_link(pci);
if (pci->link_gen == 2) {
/* Allow Gen2 mode after the link is up. */
@ -847,11 +841,7 @@ static int imx6_pcie_start_link(struct dw_pcie *pci)
}
/* Make sure link training is finished as well! */
ret = dw_pcie_wait_for_link(pci);
if (ret) {
dev_err(dev, "Failed to bring link up!\n");
goto err_reset_phy;
}
dw_pcie_wait_for_link(pci);
} else {
dev_info(dev, "Link: Gen2 disabled\n");
}
@ -923,6 +913,7 @@ static void imx6_pcie_pm_turnoff(struct imx6_pcie *imx6_pcie)
/* Others poke directly at IOMUXC registers */
switch (imx6_pcie->drvdata->variant) {
case IMX6SX:
case IMX6QP:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX6SX_GPR12_PCIE_PM_TURN_OFF,
IMX6SX_GPR12_PCIE_PM_TURN_OFF);
@ -983,6 +974,7 @@ static int imx6_pcie_suspend_noirq(struct device *dev)
case IMX8MM:
if (phy_power_off(imx6_pcie->phy))
dev_err(dev, "unable to power off PHY\n");
phy_exit(imx6_pcie->phy);
break;
default:
break;
@ -1252,7 +1244,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
[IMX6QP] = {
.variant = IMX6QP,
.flags = IMX6_PCIE_FLAG_IMX6_PHY |
IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE |
IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
.dbi_length = 0x200,
},
[IMX7D] = {