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51 lines
1.5 KiB
Diff
51 lines
1.5 KiB
Diff
From 4612495fdf28d10224c4f713626a480e99e7f5da Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Thu, 3 Feb 2022 11:17:16 +0000
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Subject: [PATCH 715/828] dtoverlay: Reduce size of PCIE IB window in
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pcie-32-dma overlay
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The PCIE inbound window is rounded up to a power of 2, so the default
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of 3GB rounds up to 4GB starting at 0. This prohibits the MSI vector
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sitting at 0x0_fffffffc, and causes warnings from some subsystems
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(eg ahci) of a 64bit address on a 32bit configuration.
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Reduce the window down to 2GB to avoid this issue.
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https://github.com/raspberrypi/linux/issues/4848
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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.../dts/overlays/pcie-32bit-dma-overlay.dts | 20 +++++++++++++++++++
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1 file changed, 20 insertions(+)
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--- a/arch/arm/boot/dts/overlays/pcie-32bit-dma-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/pcie-32bit-dma-overlay.dts
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@@ -11,8 +11,28 @@
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fragment@0 {
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target-path = "/aliases";
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__overlay__ {
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+ /*
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+ * Removing this alias stops the firmware patching the
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+ * PCIE DT dma-ranges based on the detected chip
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+ * revision.
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+ */
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pcie0 = "";
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};
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};
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+ fragment@1 {
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+ target = <&pcie0>;
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+ __overlay__ {
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+ /*
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+ * The size of the range is rounded up to a power of 2,
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+ * so the range ends up being 0-4GB, and the MSI vector
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+ * gets pushed beyond 4GB.
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+ */
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+ #address-cells = <3>;
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+ #size-cells = <2>;
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+ dma-ranges = <0x02000000 0x0 0x00000000 0x0 0x00000000
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+ 0x0 0x80000000>;
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+ };
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+ };
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+
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};
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