PCI: tegra194: Clean up the exit path for Endpoint mode

Clean up the exit path during .remove() and .shutdown() calls when in
Endpoint mode.

Link: https://lore.kernel.org/r/20220721142052.25971-14-vidyas@nvidia.com
Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index f82c70be72ef9680ef623ff604d1b0a6f861a747..39f7ae61fdc669517fd41332e452e43750c328a9 100644 (file)
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -2145,12 +2145,18 @@ static int tegra_pcie_dw_remove(struct platform_device *pdev)
 {
        struct tegra_pcie_dw *pcie = platform_get_drvdata(pdev);
 
-       if (!pcie->link_state)
-               return 0;
+       if (pcie->mode == DW_PCIE_RC_TYPE) {
+               if (!pcie->link_state)
+                       return 0;
+
+               debugfs_remove_recursive(pcie->debugfs);
+               tegra_pcie_deinit_controller(pcie);
+               pm_runtime_put_sync(pcie->dev);
+       } else {
+               disable_irq(pcie->pex_rst_irq);
+               pex_ep_event_pex_rst_assert(pcie);
+       }
 
-       debugfs_remove_recursive(pcie->debugfs);
-       tegra_pcie_deinit_controller(pcie);
-       pm_runtime_put_sync(pcie->dev);
        pm_runtime_disable(pcie->dev);
        tegra_bpmp_put(pcie->bpmp);
        if (pcie->pex_refclk_sel_gpiod)
@@ -2164,6 +2170,11 @@ static int tegra_pcie_dw_suspend_late(struct device *dev)
        struct tegra_pcie_dw *pcie = dev_get_drvdata(dev);
        u32 val;
 
+       if (pcie->mode == DW_PCIE_EP_TYPE) {
+               dev_err(dev, "Failed to Suspend as Tegra PCIe is in EP mode\n");
+               return -EPERM;
+       }
+
        if (!pcie->link_state)
                return 0;
 
@@ -2251,18 +2262,24 @@ static void tegra_pcie_dw_shutdown(struct platform_device *pdev)
 {
        struct tegra_pcie_dw *pcie = platform_get_drvdata(pdev);
 
-       if (!pcie->link_state)
-               return;
+       if (pcie->mode == DW_PCIE_RC_TYPE) {
+               if (!pcie->link_state)
+                       return;
 
-       debugfs_remove_recursive(pcie->debugfs);
-       tegra_pcie_downstream_dev_to_D0(pcie);
+               debugfs_remove_recursive(pcie->debugfs);
+               tegra_pcie_downstream_dev_to_D0(pcie);
 
-       disable_irq(pcie->pci.pp.irq);
-       if (IS_ENABLED(CONFIG_PCI_MSI))
-               disable_irq(pcie->pci.pp.msi_irq);
+               disable_irq(pcie->pci.pp.irq);
+               if (IS_ENABLED(CONFIG_PCI_MSI))
+                       disable_irq(pcie->pci.pp.msi_irq);
 
-       tegra_pcie_dw_pme_turnoff(pcie);
-       tegra_pcie_unconfig_controller(pcie);
+               tegra_pcie_dw_pme_turnoff(pcie);
+               tegra_pcie_unconfig_controller(pcie);
+               pm_runtime_put_sync(pcie->dev);
+       } else {
+               disable_irq(pcie->pex_rst_irq);
+               pex_ep_event_pex_rst_assert(pcie);
+       }
 }
 
 static const struct tegra_pcie_dw_of_data tegra_pcie_dw_rc_of_data = {