PCI: tegra: Don't allow suspend when Tegra PCIe is in EP mode

When Tegra PCIe is in endpoint mode it should be available for root port.
PCIe link up by root port fails if it is in suspend state. So, don't allow
Tegra to suspend when endpoint mode is enabled.

Bug 200715162
Change-Id: I11f8f0c2f4e293535646147c81f2486791f51dbe
Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Signed-off-by: Om Prakash Singh <omp@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2509192
Reviewed-by: Vidya Sagar <vidyas@nvidia.com>
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/pci/dwc/pcie-tegra.c b/drivers/pci/dwc/pcie-tegra.c
index 210c96162..923cf7c30 100644
--- a/drivers/pci/dwc/pcie-tegra.c
+++ b/drivers/pci/dwc/pcie-tegra.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017 - 2020, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2017 - 2021, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -4591,6 +4591,11 @@ 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, "Tegra PCIe is in EP mode, suspend not allowed");
+                return -EPERM;
+        }
+
         if (!pcie->link_state && pcie->power_down_en)
                 return 0;