drm/mipi-dbi: display a cropped region of an oversized framebuffer

.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 500+
+      - Raspberry Pi CM0
+      - 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 URL returned from `raspinfo | pastebinit` into this section.
+      Alternatively, 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/scripts/prune_stale_artifacts.sh

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+#!/usr/bin/env bash
+# Delete artifacts that exceed the retention periods defined in kernel-build.yml.
+# Parses build names and retention values directly from the workflow file, so
+# it stays correct as the matrix evolves.
+# Dry-run by default; set DRY_RUN=0 to actually delete.
+#
+# Prerequisites:
+#   - gh CLI authenticated (gh auth status)
+#   - jq installed
+#   - Token needs actions:write scope (or fine-grained Actions: Read and write)
+
+set -euo pipefail
+
+REPO="raspberrypi/linux"
+DRY_RUN="${DRY_RUN:-1}"
+TODAY_EPOCH=$(date -u +%s)
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+WORKFLOW_FILE="${SCRIPT_DIR}/../workflows/kernel-build.yml"
+
+# Extract build names and retention values from the workflow matrix.
+# Uses a minimal line-by-line parser: tracks the current '- name:' entry
+# and emits name=days when it encounters the matching 'retention:' field.
+declare -A RETENTION
+while IFS='=' read -r name days; do
+  RETENTION["${name}_build"]="$days"
+done < <(python3 - "$WORKFLOW_FILE" <<'EOF'
+import sys, re
+
+current_name = None
+with open(sys.argv[1]) as f:
+    for line in f:
+        m = re.match(r'\s+- name:\s+(\S+)', line)
+        if m:
+            current_name = m.group(1)
+            continue
+        m = re.match(r'\s+retention:\s+(\d+)', line)
+        if m and current_name:
+            print(f"{current_name}={m.group(1)}")
+            current_name = None
+EOF
+)
+
+if [[ ${#RETENTION[@]} -eq 0 ]]; then
+  echo "Error: no matrix entries with retention found in ${WORKFLOW_FILE}" >&2
+  exit 1
+fi
+
+echo "Retention policy from $(basename "$WORKFLOW_FILE"):"
+for name in $(echo "${!RETENTION[@]}" | tr ' ' '\n' | sort); do
+  echo "  ${name}: ${RETENTION[$name]} days"
+done
+echo ""
+
+IS_INTERACTIVE=0
+[[ -t 1 ]] && IS_INTERACTIVE=1
+
+deleted=0
+stale=0
+kept=0
+
+for artifact_name in "${!RETENTION[@]}"; do
+  max_age_days="${RETENTION[$artifact_name]}"
+  cutoff_epoch=$(( TODAY_EPOCH - max_age_days * 86400 ))
+
+  # Collect all stale IDs before deleting anything, so that deletions
+  # during iteration don't shift pages and cause artifacts to be missed.
+  stale_ids=()
+  stale_meta=()  # parallel array: "created_at age_days" per entry
+
+  page=1
+  while true; do
+    response=$(gh api \
+      "/repos/${REPO}/actions/artifacts?per_page=100&page=${page}&name=${artifact_name}")
+
+    items=$(echo "$response" | jq -c '.artifacts[]')
+    [[ -z "$items" ]] && break
+
+    while IFS= read -r item; do
+      id=$(echo "$item" | jq -r '.id')
+      created_at=$(echo "$item" | jq -r '.created_at')
+      created_epoch=$(date -u -d "$created_at" +%s)
+
+      age_days=$(( (TODAY_EPOCH - created_epoch) / 86400 ))
+      if (( created_epoch < cutoff_epoch )); then
+        stale_ids+=("$id")
+        stale_meta+=("${created_at} ${age_days}")
+        if [[ "$DRY_RUN" != "0" ]]; then
+          echo "STALE  id=$id  name=$artifact_name  created=$created_at  age=${age_days}d"
+        elif [[ "$IS_INTERACTIVE" == "1" ]]; then
+          echo -ne "\r  ${artifact_name}  age=${age_days}d      "
+        fi
+        (( stale++ )) || true
+      else
+        if [[ "$IS_INTERACTIVE" == "1" ]]; then
+          echo -ne "\r  ${artifact_name}  age=${age_days}d      "
+        fi
+        (( kept++ )) || true
+      fi
+    done <<< "$items"
+
+    item_count=$(echo "$response" | jq '.artifacts | length')
+    (( item_count < 100 )) && break
+    (( page++ ))
+  done
+
+  if [[ "$DRY_RUN" != "0" ]]; then
+    continue
+  fi
+
+  # End the progress line before printing deletion output
+  [[ "$IS_INTERACTIVE" == "1" && ${#stale_ids[@]} -gt 0 ]] && echo
+
+  for i in "${!stale_ids[@]}"; do
+    id="${stale_ids[$i]}"
+    created_at="${stale_meta[$i]% *}"
+    age_days="${stale_meta[$i]##* }"
+    gh api --method DELETE "/repos/${REPO}/actions/artifacts/${id}"
+    echo "DELETED  id=$id  name=$artifact_name  created=$created_at  age=${age_days}d"
+    (( deleted++ )) || true
+  done
+done
+
+echo ""
+if [[ "$DRY_RUN" != "0" ]]; then
+  echo "Done. Stale: $stale  Within-policy: $kept  (dry run)"
+else
+  echo "Done. Deleted: $deleted  Within-policy: $kept"
+fi

.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
+--ignore UNKNOWN_COMMIT_ID

.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 gnutls-dev
+      timeout-minutes: 15
+
+    - 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- bcm2709_defconfig
+        make ARCH=arm KERNEL=kernel CROSS_COMPILE=arm-linux-gnueabihf- dtbs
+        ${{env.UTILS_DIR}}/overlaycheck/overlaycheck -t