linux-kernel - [PATCH] PCI: tegra: Read "dbi" base address to program in application logic

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Date:   Thu, 26 Nov 2020 00:55:54 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     <lorenzo.pieralisi@....com>, <robh@...nel.org>,
        <bhelgaas@...gle.com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <jingoohan1@...il.com>, <kw@...ux.com>,
        <amanharitsh123@...il.com>, <gregkh@...uxfoundation.org>
CC:     <linux-pci@...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] PCI: tegra: Read "dbi" base address to program in application logic

PCIe controller in Tegra194 requires the "dbi" region base address to be
programmed in one of the application logic registers to enable CPU access
to the "dbi" region. But, commit a0fd361db8e5 ("PCI: dwc: Move "dbi",
"dbi2", and "addr_space" resource setup into common code") moved the code
that reads the whereabouts of "dbi" region to the common code causing the
existing code in pcie-tegra194.c file to program NULL in the application
logic registers. This is causing null pointer dereference when the "dbi"
registers are accessed. This issue is fixed by explicitly reading the
"dbi" base address from DT node.

Fixes: a0fd361db8e5 ("PCI: dwc: Move "dbi", "dbi2", and "addr_space" resource setup into common code")
Signed-off-by: Vidya Sagar <vidyas@...dia.com>
---
 drivers/pci/controller/dwc/pcie-tegra194.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index fa54d9aaa430..ac2225175087 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -1053,9 +1053,16 @@ static int tegra_pcie_enable_phy(struct tegra_pcie_dw *pcie)
 
 static int tegra_pcie_dw_parse_dt(struct tegra_pcie_dw *pcie)
 {
+	struct platform_device *pdev = to_platform_device(pcie->dev);
 	struct device_node *np = pcie->dev->of_node;
 	int ret;
 
+	pcie->dbi_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
+	if (!pcie->dbi_res) {
+		dev_err(pcie->dev, "Failed to find \"dbi\" region\n");
+		return -ENODEV;
+	}
+
 	ret = of_property_read_u32(np, "nvidia,aspm-cmrt-us", &pcie->aspm_cmrt);
 	if (ret < 0) {
 		dev_info(pcie->dev, "Failed to read ASPM T_cmrt: %d\n", ret);
-- 
2.17.1