mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-11 12:44:49 -04:00
Code Issues Packages Projects Releases Wiki Activity

PCI: tegra: Read "dbi" base address to program in application logic

Browse Source 
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 a0fd361db8 ("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.

Link: https://lore.kernel.org/r/20201125192554.5401-1-vidyas@nvidia.com
Fixes: a0fd361db8 ("PCI: dwc: Move "dbi", "dbi2", and "addr_space" resource setup into common code")
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Vidya Sagar
2020-11-26 00:55:54 +05:30
committed by Lorenzo Pieralisi
parent 369b868f4a
commit d5353c00cf
1 changed files with 7 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/pci/controller/dwc/pcie-tegra194.c
View File

@@ -1063,9 +1063,16 @@ 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);