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FROMLIST: PCI: qcom: Add D3cold support #461

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FROMLIST: PCI: qcom: Add D3cold support #461

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46 changes: 32 additions & 14 deletions drivers/pci/controller/dwc/pcie-qcom.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1308,13 +1308,17 @@ static int qcom_pcie_host_init(struct dw_pcie_rp *pp)
if (ret)
goto err_deinit;

ret = pci_pwrctrl_create_devices(pci->dev);
if (ret)
goto err_disable_phy;
if (!pci->suspended) {
ret = pci_pwrctrl_create_devices(pci->dev);
if (ret)
goto err_disable_phy;
}

ret = pci_pwrctrl_power_on_devices(pci->dev);
if (ret)
goto err_pwrctrl_destroy;
if (!pp->skip_pwrctrl_off) {
ret = pci_pwrctrl_power_on_devices(pci->dev);
if (ret)
goto err_pwrctrl_destroy;
}

if (pcie->cfg->ops->post_init) {
ret = pcie->cfg->ops->post_init(pcie);
Expand Down Expand Up @@ -1356,11 +1360,14 @@ static void qcom_pcie_host_deinit(struct dw_pcie_rp *pp)

qcom_pcie_perst_assert(pcie);

/*
* No need to destroy pwrctrl devices as this function only gets called
* during system suspend as of now.
*/
pci_pwrctrl_power_off_devices(pci->dev);
if (!pci->pp.skip_pwrctrl_off) {
/*
* No need to destroy pwrctrl devices as this function only gets called
* during system suspend as of now.
*/
pci_pwrctrl_power_off_devices(pci->dev);
}

qcom_pcie_phy_power_off(pcie);
pcie->cfg->ops->deinit(pcie);
}
Expand Down Expand Up @@ -2050,11 +2057,16 @@ static int qcom_pcie_resume_noirq(struct device *dev)
ret = icc_enable(pcie->icc_mem);
if (ret) {
dev_err(dev, "Failed to enable PCIe-MEM interconnect path: %d\n", ret);
return ret;
goto disable_icc_cpu;
}

/*
* Ignore -ENODEV & -EIO here since it is expected when no endpoint is
* connected to the PCIe link.
*/
ret = dw_pcie_resume_noirq(pcie->pci);
if (ret && (ret != -ETIMEDOUT))
return ret;
if (ret && ret != -ENODEV && ret != -EIO)
goto disable_icc_mem;
} else {
if (pm_suspend_target_state != PM_SUSPEND_MEM) {
ret = icc_enable(pcie->icc_cpu);
Expand All @@ -2069,6 +2081,12 @@ static int qcom_pcie_resume_noirq(struct device *dev)
qcom_pcie_icc_opp_update(pcie);

return 0;
disable_icc_mem:
icc_disable(pcie->icc_mem);
disable_icc_cpu:
icc_disable(pcie->icc_cpu);

return ret;
}

static const struct of_device_id qcom_pcie_match[] = {
Expand Down