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arm64: dts: qcom: sc7180: Add EL2 overlay for WoA devices

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WoA devices using sc7180 use android firmware to boot, which notably
includes QHEE hypervisor. This means that, so far, Linux-based OS could
only boot in EL1 on those devices.

However Windows can replace QHEE upon boot with it's own hypervisor, and
with the use of tools such as "slbounce", it's possible to do the same
for Linux-based OS, in which case some modifications to the DT are
necessary to facilitate the absence of QHEE services.

Add a EL2-specific DT overlay and apply it to sc7180 WoA devices to
create -el2.dtb for each of them alongside "normal" dtb.

Signed-off-by: Nikita Travkin <nikita@trvn.ru>
Link: https://lore.kernel.org/r/20250503-sc-el2-overlays-v2-1-24e9b4572e15@trvn.ru
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
This commit is contained in:
Nikita Travkin
2025-05-06 22:26:35 -07:00
committed by Bjorn Andersson
parent 635d0c8edf
commit 0d95f64be4
2 changed files with 24 additions and 1 deletions
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arch/arm64/boot/dts/qcom/Makefile
+2 -1
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@@ -138,7 +138,8 @@ dtb-$(CONFIG_ARCH_QCOM) += sa8295p-adp.dtb
dtb-$(CONFIG_ARCH_QCOM) += sa8540p-ride.dtb
dtb-$(CONFIG_ARCH_QCOM) += sa8775p-ride.dtb
dtb-$(CONFIG_ARCH_QCOM) += sa8775p-ride-r3.dtb
dtb-$(CONFIG_ARCH_QCOM) += sc7180-acer-aspire1.dtb
sc7180-acer-aspire1-el2-dtbs := sc7180-acer-aspire1.dtb sc7180-el2.dtbo
dtb-$(CONFIG_ARCH_QCOM) += sc7180-acer-aspire1.dtb sc7180-acer-aspire1-el2.dtb
dtb-$(CONFIG_ARCH_QCOM) += sc7180-idp.dtb
dtb-$(CONFIG_ARCH_QCOM) += sc7180-trogdor-coachz-r1.dtb
dtb-$(CONFIG_ARCH_QCOM) += sc7180-trogdor-coachz-r1-lte.dtb
arch/arm64/boot/dts/qcom/sc7180-el2.dtso
+22
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@@ -0,0 +1,22 @@
// SPDX-License-Identifier: BSD-3-Clause
/*
* sc7180 specific modifications required to boot in EL2.
*/
/dts-v1/;
/plugin/;
/* We can't and don't need to use zap shader in EL2 as linux can zap the gpu on it's own. */
&gpu {
zap-shader {
status = "disabled";
};
};
/* Venus can be used in EL2 if booted similarly to ChromeOS devices. */
&venus {
video-firmware {
iommus = <&apps_smmu 0x0c42 0x0>;
};
};