[PATCH 05/22] arm64: dts: qcom: lemans: Reserve low IOVA range for Iris

Iris VPU reserves IOVA addresses below 0x25800000 (600MB), primarily for
secure non-pixel buffers. DMA into that range, from any other stream id
would triggers unhandled SMMU page faults that cause spontaneous device
reboots. This is readily reproduced with one or more browser tabs
driving multiple concurrent video decode streams.

Add a reserved-memory IOVA reservation node covering [0, 0x25800000]
and reference it from the Iris node so the IOMMU layer keeps DMA
allocations above that boundary.

Fixes: 7bc95052c64f ("arm64: dts: qcom: sa8775p: add support for video node")
Cc: [email protected]
Signed-off-by: Vikash Garodia <[email protected]>
---
 arch/arm64/boot/dts/qcom/lemans.dtsi | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/lemans.dtsi b/arch/arm64/boot/dts/qcom/lemans.dtsi
index 695eae1b7256911e656ab1ecdd92aca135d92f39..da0326fe244850f92e080e648722b4aa0037da7b 100644
--- a/arch/arm64/boot/dts/qcom/lemans.dtsi
+++ b/arch/arm64/boot/dts/qcom/lemans.dtsi
@@ -862,6 +862,17 @@ cpucp_fw_mem: cpucp-fw@db200000 {
 			reg = <0x0 0xdb200000 0x0 0x100000>;
 			no-map;
 		};
+
+		/*
+		 * The Iris VPU reserves IOVA below 0x25800000 (600MB),
+		 * primarily for non-pixel buffers using different Stream IDs.
+		 * DMA into that range triggers unhandled SMMU faults and
+		 * spontaneous reboots, so reserve it to keep IOMMU
+		 * allocations above this boundary.
+		 */
+		iris_iova: iris-iova {
+			iommu-addresses = <&iris 0x0 0x0 0x0 0x25800000>;
+		};
 	};
 
 	smp2p-adsp {
@@ -4957,7 +4968,7 @@ &config_noc SLAVE_VENUS_CFG QCOM_ICC_TAG_ACTIVE_ONLY>,
 			interconnect-names = "cpu-cfg",
 					     "video-mem";
 
-			memory-region = <&pil_video_mem>;
+			memory-region = <&pil_video_mem>, <&iris_iova>;
 
 			resets = <&gcc GCC_VIDEO_AXI0_CLK_ARES>;
 			reset-names = "bus";

-- 
2.34.1