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dtoverlay: Reduce size of PCIE IB window in pcie-32-dma overlay

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The PCIE inbound window is rounded up to a power of 2, so the default
of 3GB rounds up to 4GB starting at 0. This prohibits the MSI vector
sitting at 0x0_fffffffc, and causes warnings from some subsystems
(eg ahci) of a 64bit address on a 32bit configuration.

Reduce the window down to 2GB to avoid this issue.

https://github.com/raspberrypi/linux/issues/4848

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
This commit is contained in:
Dave Stevenson
2022-02-03 11:17:16 +00:00
committed by Phil Elwell
parent 61d2b998e8
commit ee6a81c854
1 changed files with 18 additions and 0 deletions
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18
arch/arm/boot/dts/overlays/pcie-32bit-dma-overlay.dts
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@@ -11,8 +11,26 @@
fragment@0 {
target-path = "/aliases";
__overlay__ {
/*
* Removing this alias stops the firmware patching the
* PCIE DT dma-ranges based on the detected chip
* revision.
*/
pcie0 = "";
};
};
fragment@1 {
target = <&pcie0>;
__overlay__ {
/*
* The size of the range is rounded up to a power of 2,
* so the range ends up being 0-4GB, and the MSI vector
* gets pushed beyond 4GB.
*/
dma-ranges = <0x02000000 0x0 0x00000000 0x0 0x00000000
0x0 0x80000000>;
};
};
};