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arm64: tegra: Fix Tegra194 PCIe compatible string

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[ Upstream commit f9f711efd441ad0d22874be49986d92121862335 ]

If the kernel configuration option CONFIG_PCIE_DW_PLAT_HOST is enabled
then this can cause the kernel to incorrectly probe the generic
designware PCIe platform driver instead of the Tegra194 designware PCIe
driver. This causes a boot failure on Tegra194 because the necessary
configuration to access the hardware is not performed.

The order in which the compatible strings are populated in Device-Tree
is not relevant in this case, because the kernel will attempt to probe
the device as soon as a driver is loaded and if the generic designware
PCIe driver is loaded first, then this driver will be probed first.
Therefore, to fix this problem, remove the "snps,dw-pcie" string from
the compatible string as we never want this driver to be probe on
Tegra194.

Fixes: 2602c32f15e7 ("arm64: tegra: Add P2U and PCIe controller nodes to Tegra194 DT")
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jon Hunter 2020-02-14 13:53:53 +00:00 committed by Greg Kroah-Hartman
parent 5615f66bfd
commit d7b59cd020
2 changed files with 7 additions and 7 deletions
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2
Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt
View File

@ -118,7 +118,7 @@ Tegra194:
--------
pcie@14180000 {
compatible = "nvidia,tegra194-pcie", "snps,dw-pcie";
compatible = "nvidia,tegra194-pcie";
power-domains = <&bpmp TEGRA194_POWER_DOMAIN_PCIEX8B>;
reg = <0x00 0x14180000 0x0 0x00020000 /* appl registers (128K) */
0x00 0x38000000 0x0 0x00040000 /* configuration space (256K) */

12
arch/arm64/boot/dts/nvidia/tegra194.dtsi
View File

@ -1151,7 +1151,7 @@
};
pcie@14100000 {
compatible = "nvidia,tegra194-pcie", "snps,dw-pcie";
compatible = "nvidia,tegra194-pcie";
power-domains = <&bpmp TEGRA194_POWER_DOMAIN_PCIEX1A>;
reg = <0x00 0x14100000 0x0 0x00020000 /* appl registers (128K) */
0x00 0x30000000 0x0 0x00040000 /* configuration space (256K) */
@ -1197,7 +1197,7 @@
};
pcie@14120000 {
compatible = "nvidia,tegra194-pcie", "snps,dw-pcie";
compatible = "nvidia,tegra194-pcie";
power-domains = <&bpmp TEGRA194_POWER_DOMAIN_PCIEX1A>;
reg = <0x00 0x14120000 0x0 0x00020000 /* appl registers (128K) */
0x00 0x32000000 0x0 0x00040000 /* configuration space (256K) */
@ -1243,7 +1243,7 @@
};
pcie@14140000 {
compatible = "nvidia,tegra194-pcie", "snps,dw-pcie";
compatible = "nvidia,tegra194-pcie";
power-domains = <&bpmp TEGRA194_POWER_DOMAIN_PCIEX1A>;
reg = <0x00 0x14140000 0x0 0x00020000 /* appl registers (128K) */
0x00 0x34000000 0x0 0x00040000 /* configuration space (256K) */
@ -1289,7 +1289,7 @@
};
pcie@14160000 {
compatible = "nvidia,tegra194-pcie", "snps,dw-pcie";
compatible = "nvidia,tegra194-pcie";
power-domains = <&bpmp TEGRA194_POWER_DOMAIN_PCIEX4A>;
reg = <0x00 0x14160000 0x0 0x00020000 /* appl registers (128K) */
0x00 0x36000000 0x0 0x00040000 /* configuration space (256K) */
@ -1335,7 +1335,7 @@
};
pcie@14180000 {
compatible = "nvidia,tegra194-pcie", "snps,dw-pcie";
compatible = "nvidia,tegra194-pcie";
power-domains = <&bpmp TEGRA194_POWER_DOMAIN_PCIEX8B>;
reg = <0x00 0x14180000 0x0 0x00020000 /* appl registers (128K) */
0x00 0x38000000 0x0 0x00040000 /* configuration space (256K) */
@ -1381,7 +1381,7 @@
};
pcie@141a0000 {
compatible = "nvidia,tegra194-pcie", "snps,dw-pcie";
compatible = "nvidia,tegra194-pcie";
power-domains = <&bpmp TEGRA194_POWER_DOMAIN_PCIEX8A>;
reg = <0x00 0x141a0000 0x0 0x00020000 /* appl registers (128K) */
0x00 0x3a000000 0x0 0x00040000 /* configuration space (256K) */