linux-kernel - [PATCH V2 4/5] PCI: tegra: Don't allow suspend when Tegra PCIe is in EP mode

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Date:   Sun, 6 Jun 2021 13:52:03 +0530
From:   Om Prakash Singh <omp@...dia.com>
To:     <kw@...ux.com>, <helgaas@...nel.org>, <vidyas@...dia.com>,
        <lorenzo.pieralisi@....com>, <bhelgaas@...gle.com>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>
CC:     <linux-tegra@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kthota@...dia.com>,
        <mmaddireddy@...dia.com>, Om Prakash Singh <omp@...dia.com>
Subject: [PATCH V2 4/5] 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.

Signed-off-by: Om Prakash Singh <omp@...dia.com>
---

Changes in V2:
	- Update return value and error log as per comment from Krzysztof Wilczyński

 drivers/pci/controller/dwc/pcie-tegra194.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index 64ec0da31b5b..ae4c0a29818d 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -2276,6 +2276,11 @@ 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, "Suspend is not supported in EP mode");
+		return -ENOTSUPP;
+	}
+
 	if (!pcie->link_state)
 		return 0;
 
-- 
2.17.1