linux-kernel - [PATCH V6 13/16] PCI: tegra194: Cleanup the exit path for endpoint mode

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Date:   Thu, 21 Jul 2022 19:50:49 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     <bhelgaas@...gle.com>, <lpieralisi@...nel.org>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <jingoohan1@...il.com>, <gustavo.pimentel@...opsys.com>
CC:     <kw@...ux.com>, <kishon@...com>, <linux-pci@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kthota@...dia.com>,
        <mmaddireddy@...dia.com>, <vidyas@...dia.com>, <sagar.tv@...il.com>
Subject: [PATCH V6 13/16] PCI: tegra194: Cleanup the exit path for endpoint mode

Cleanup the exit path during remove, shutdown calls for the endpoint
mode.

Signed-off-by: Vidya Sagar <vidyas@...dia.com>
---
V6:
* New addition in V6 based on Bjorn's review comment

 drivers/pci/controller/dwc/pcie-tegra194.c | 45 +++++++++++++++-------
 1 file changed, 31 insertions(+), 14 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index f82c70be72ef..39f7ae61fdc6 100644
--- 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 = {
-- 
2.17.1