Backport HEVC decoder as submitted to linux-media as v2

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: "Bug report"
+description: Create a report to help us fix your issue
+body:
+- type: markdown
+  attributes:
+    value: |
+      **Is this the right place for my bug report?**
+      This repository contains the Linux kernel used on the Raspberry Pi.
+      If you believe that the issue you are seeing is kernel-related, this is the right place.
+      If not, we have other repositories for the GPU firmware at [github.com/raspberrypi/firmware](https://github.com/raspberrypi/firmware) and Raspberry Pi userland applications at [github.com/raspberrypi/userland](https://github.com/raspberrypi/userland).
+
+      If you have problems with the Raspbian distribution packages, report them in the [github.com/RPi-Distro/repo](https://github.com/RPi-Distro/repo).
+      If you simply have a question, then [the Raspberry Pi forums](https://www.raspberrypi.org/forums) are the best place to ask it.
+
+- type: textarea
+  id: description
+  attributes:
+    label: Describe the bug
+    description: |
+      Add a clear and concise description of what you think the bug is.
+  validations:
+    required: true
+
+- type: textarea
+  id: reproduce
+  attributes:
+    label: Steps to reproduce the behaviour
+    description: |
+      List the steps required to reproduce the issue.
+  validations:
+    required: true
+
+- type: dropdown
+  id: model
+  attributes:
+    label: Device (s)
+    description: On which device you are facing the bug?
+    multiple: true
+    options:
+      - Raspberry Pi Zero
+      - Raspberry Pi Zero W / WH
+      - Raspberry Pi Zero 2 W
+      - Raspberry Pi 1 Mod. A
+      - Raspberry Pi 1 Mod. A+
+      - Raspberry Pi 1 Mod. B
+      - Raspberry Pi 1 Mod. B+
+      - Raspberry Pi 2 Mod. B
+      - Raspberry Pi 2 Mod. B v1.2
+      - Raspberry Pi 3 Mod. A+
+      - Raspberry Pi 3 Mod. B
+      - Raspberry Pi 3 Mod. B+
+      - Raspberry Pi 4 Mod. B
+      - Raspberry Pi 400
+      - Raspberry Pi 5
+      - Raspberry Pi 500
+      - Raspberry Pi CM1
+      - Raspberry Pi CM3
+      - Raspberry Pi CM3 Lite
+      - Raspberry Pi CM3+
+      - Raspberry Pi CM3+ Lite
+      - Raspberry Pi CM4
+      - Raspberry Pi CM4 Lite
+      - Raspberry Pi CM5
+      - Raspberry Pi CM5 Lite
+      - Other
+  validations:
+    required: true
+
+- type: textarea
+  id: system
+  attributes:
+    label: System
+    description: |
+      Copy and paste the results of the raspinfo command in to this section.
+      Alternatively, copy and paste a pastebin link, or add answers to the following questions:
+      * Which OS and version (`cat /etc/rpi-issue`)?
+      * Which firmware version (`vcgencmd version`)?
+      * Which kernel version (`uname -a`)?
+  validations:
+    required: true
+
+- type: textarea
+  id: logs
+  attributes:
+    label: Logs
+    description: |
+      If applicable, add the relevant output from `dmesg` or similar.
+
+- type: textarea
+  id: additional
+  attributes:
+    label: Additional context
+    description: |
+      Add any other relevant context for the problem.
+

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: "⛔ Question"
+    url: https://forums.raspberrypi.com
+    about: "Please do not use GitHub for asking questions. If you simply have a question, then the Raspberry Pi forums are the best place to ask it. Thanks in advance for helping us keep the issue tracker clean!"
+  - name: "⛔ Problems with Raspberry Pi OS packages"
+    url: https://github.com/RPi-Distro/repo
+    about: "If you have problems with a Raspberry Pi OS package, please report them at https://github.com/RPi-Distro/repo."
+

.github/workflows/checkpatch.yml

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+name: Advisory checkpatch review
+on: [pull_request]
+
+jobs:
+  review:
+    name: checkpatch review
+    runs-on: ubuntu-latest
+    steps:
+    - name: 'Calculate PR commits + 1'
+      run: echo "PR_FETCH_DEPTH=$(( ${{ github.event.pull_request.commits }} + 1 ))" >> $GITHUB_ENV
+    - uses: actions/checkout@v4
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+        fetch-depth: ${{ env.PR_FETCH_DEPTH }}
+    - name: Copy checkpatch.conf
+      run: cp ${{github.workspace}}/.github/workflows/ci_checkpatch.conf ${{github.workspace}}/.checkpatch.conf
+    - name: Run checkpatch review
+      uses: webispy/checkpatch-action@v9

.github/workflows/ci_checkpatch.conf

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+--no-tree
+--ignore FILE_PATH_CHANGES
+--ignore GIT_COMMIT_ID
+--ignore SPDX_LICENSE_TAG

.github/workflows/dtoverlaycheck.yml

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+name: Pi dtoverlay checks
+
+on:
+  pull_request:
+    paths-ignore:
+      - '.github/**'
+    branches: [ "rpi-*" ]
+  push:
+    paths-ignore:
+      - '.github/**'
+    branches: [ "rpi-*" ]
+  workflow_dispatch:
+
+env:
+  UTILS_DIR: "${{github.workspace}}/utils"
+
+jobs:
+  dtoverlaycheck:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Install toolchain
+      run: |
+        sudo apt update
+        sudo apt-get install gcc-arm-linux-gnueabihf libfdt-dev device-tree-compiler
+      timeout-minutes: 10
+
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 1
+        clean: true
+
+    - name: overlaycheck
+      run: |
+        git clone https://github.com/raspberrypi/utils ${{env.UTILS_DIR}}
+        cd ${{env.UTILS_DIR}}
+        pwd
+        mkdir build
+        cd build
+        pwd
+        cmake ..
+        make -j4
+        sudo make install
+        cd ${{github.workspace}}
+        pwd
+        make ARCH=arm KERNEL=kernel CROSS_COMPILE=arm-linux-gnueabihf- bcm2711_defconfig
+        make ARCH=arm KERNEL=kernel CROSS_COMPILE=arm-linux-gnueabihf- dtbs
+        ${{env.UTILS_DIR}}/overlaycheck/overlaycheck

.github/workflows/kernel-build.yml

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+name: Pi kernel build tests
+
+on:
+  pull_request:
+    paths-ignore:
+      - '.github/**'
+    branches: [ "rpi-*" ]
+  push:
+    paths-ignore:
+      - '.github/**'
+    branches: [ "rpi-*" ]
+  workflow_dispatch:
+
+env:
+  NUM_JOBS: 6
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - name: bcm2835
+            arch: arm
+            defconfig: bcm2835_defconfig
+            kernel: kernel
+
+          - name: arm64
+            arch: arm64
+            defconfig: defconfig
+            kernel: kernel8
+
+          - name: bcmrpi
+            arch: arm
+            defconfig: bcmrpi_defconfig
+            kernel: kernel
+
+          - name: bcm2709
+            arch: arm
+            defconfig: bcm2709_defconfig
+            kernel: kernel7
+
+          - name: bcm2711
+            arch: arm
+            defconfig: bcm2711_defconfig
+            kernel: kernel7l
+
+          - name: bcm2711_arm64
+            arch: arm64
+            defconfig: bcm2711_defconfig
+            kernel: kernel8
+
+          - name: bcm2712
+            arch: arm64
+            defconfig: bcm2712_defconfig
+            kernel: kernel_2712
+
+    steps:
+    - name: Update install
+      run:
+        sudo apt-get update
+
+    - name: Install toolchain
+      run:
+        if [[ "${{matrix.arch}}" == "arm64" ]]; then
+          sudo apt-get install gcc-aarch64-linux-gnu;
+        else
+          sudo apt-get install gcc-arm-linux-gnueabihf;
+        fi
+      timeout-minutes: 5
+
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 1
+        clean: true
+
+    - name: Build kernel ${{matrix.name}}
+      run: |
+        mkdir ${{github.workspace}}/build
+        export ARCH=${{matrix.arch}}
+        if [[ "$ARCH" == "arm64" ]]; then
+          export CROSS_COMPILE=aarch64-linux-gnu-
+          export DTS_SUBDIR=broadcom
+          export IMAGE=Image.gz
+        else
+          export CROSS_COMPILE=arm-linux-gnueabihf-
+          export DTS_SUBDIR=broadcom
+          export IMAGE=zImage
+        fi
+        make O=${{github.workspace}}/build ${{matrix.defconfig}}
+        scripts/config --file ${{github.workspace}}/build/.config --set-val CONFIG_WERROR y
+        make O=${{github.workspace}}/build -j ${{env.NUM_JOBS}} $IMAGE modules dtbs
+        mkdir -p ${{github.workspace}}/install/boot/overlays
+        make O=${{github.workspace}}/build INSTALL_MOD_PATH=${{github.workspace}}/install modules_install
+        cp ${{github.workspace}}/build/arch/${ARCH}/boot/dts/${DTS_SUBDIR}/*.dtb ${{github.workspace}}/install/boot/
+        cp ${{github.workspace}}/build/arch/${ARCH}/boot/dts/overlays/*.dtb* ${{github.workspace}}/install/boot/overlays/
+        cp ${{github.workspace}}/arch/${ARCH}/boot/dts/overlays/README ${{github.workspace}}/install/boot/overlays/
+        cp ${{github.workspace}}/build/arch/${ARCH}/boot/$IMAGE ${{github.workspace}}/install/boot/${{matrix.kernel}}.img
+
+    - name: Tar build
+      run: tar -cvf ${{matrix.name}}_build.tar -C ${{github.workspace}}/install .
+
+    - name: Upload results
+      uses: actions/upload-artifact@v4
+      with:
+        name: ${{matrix.name}}_build
+        path: ${{matrix.name}}_build.tar
+        retention-days: 90

.github/workflows/kunit.yml

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+name: KUnit Tests
+
+on:
+  pull_request:
+    branches: [ "rpi-*"]
+
+  push:
+    branches: [ "rpi-*"]
+
+jobs:
+  core:
+    name: Generic DRM/KMS Unit Tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Run Generic DRM Tests
+        run: |
+          echo Skipping ./tools/testing/kunit/kunit.py run \
+              --kunitconfig=drivers/gpu/drm/tests
+
+  vc4-arm:
+    name: VC4 Unit Tests on ARM
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y gcc-arm-linux-gnueabihf qemu-system-arm
+
+      - name: Run VC4 Tests
+        run: |
+          ./tools/testing/kunit/kunit.py run \
+              --kunitconfig=drivers/gpu/drm/vc4/tests \
+              --cross_compile=arm-linux-gnueabihf- --arch=arm
+
+  vc4-arm64:
+    name: VC4 Unit Tests on ARM64
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y gcc-aarch64-linux-gnu qemu-system-arm
+
+      - name: Run VC4 Tests
+        run: |
+          ./tools/testing/kunit/kunit.py run \
+              --kunitconfig=drivers/gpu/drm/vc4/tests \
+              --cross_compile=aarch64-linux-gnu- --arch=arm64