From 2770d39f1052dcc9bb1ac4c103bcfcd5042558e0 Mon Sep 17 00:00:00 2001
From: Anton Bambura <jenneron@protonmail.com>
Date: Wed, 1 Nov 2023 03:54:36 +0200
Subject: [PATCH] soc-qcom-sc7180: set non-strict iommu for eMMC, SD card and
 USB (MR 4526)

[ci:skip-build]: already built successfully in CI
---
 .../00-sc7180-nonstrict-iommu.sh               | 18 ++++++++++++++++++
 device/community/soc-qcom-sc7180/APKBUILD      |  9 ++++++++-
 2 files changed, 26 insertions(+), 1 deletion(-)
 create mode 100644 device/community/soc-qcom-sc7180/00-sc7180-nonstrict-iommu.sh

diff --git a/device/community/soc-qcom-sc7180/00-sc7180-nonstrict-iommu.sh b/device/community/soc-qcom-sc7180/00-sc7180-nonstrict-iommu.sh
new file mode 100644
index 000000000..af491c259
--- /dev/null
+++ b/device/community/soc-qcom-sc7180/00-sc7180-nonstrict-iommu.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+# This script relaxes iommu for the devices, relaxing memory
+# protection, but we consider it a fine tradeoff because those
+# hardware blocks don't have firmware on them.
+
+# It Increases eMMC speed by 15% according to gnome disks benchmark
+# with sample size 1000 MiB and number of samples 2.
+
+iommus="
+	/sys/devices/platform/soc@0/7c4000.mmc/iommu_group/type
+	/sys/devices/platform/soc@0/8804000.mmc/iommu_group/type
+	/sys/devices/platform/soc@0/a6f8800.usb/a600000.usb/iommu_group/type
+"
+
+for iommu in $iommus; do
+	[ -f "$iommu" ] && echo "DMA-FQ" > "$iommu"
+done
diff --git a/device/community/soc-qcom-sc7180/APKBUILD b/device/community/soc-qcom-sc7180/APKBUILD
index fe5b437e4..97568020d 100644
--- a/device/community/soc-qcom-sc7180/APKBUILD
+++ b/device/community/soc-qcom-sc7180/APKBUILD
@@ -1,7 +1,7 @@
 # Maintainer: Jenneron <jenneron@protonmail.com>
 pkgname=soc-qcom-sc7180
 pkgdesc="Common package for Qualcomm Snapdragon 7cx devices"
-pkgver=1
+pkgver=1.1
 pkgrel=0
 url="https://postmarketos.org"
 license="BSD-3-Clause"
@@ -11,9 +11,13 @@ subpackages="
 	$pkgname-nonfree-firmware:nonfree_firmware
 	$pkgname-vulkan
 "
+source="00-sc7180-nonstrict-iommu.sh"
 
 package() {
 	mkdir -p "$pkgdir"
+
+	install -Dm755 "$srcdir"/00-sc7180-nonstrict-iommu.sh \
+		-t "$pkgdir"/usr/share/mkinitfs/hooks
 }
 
 nonfree_firmware() {
@@ -30,3 +34,6 @@ vulkan() {
 	mkdir "$subpkgdir"
 }
 
+sha512sums="
+8d76fc3ed580e5950bcb8561c08bf56c52b8693605dee04f174a49154e270b5ac6d4303bc00499864f30c352e9a0c06c449253e0b8ba974e3d85554f306c84fc  00-sc7180-nonstrict-iommu.sh
+"