Intel IPU4 Drivers Kernel Patch

Overview

This patch adds Intel IPU4 camera drivers to Linux kernel 6.6+. The drivers have been modernized to use current kernel APIs and integrate directly with the kernel build system.

What's Included

• Core IPU4 Driver: Main hardware interface
• ISYS Driver: Input system for camera data capture
• PSYS Driver: Processing system for image processing
• CRL Module: Camera sensor framework
• DW9714 Driver: VCM actuator support
• ACPI Support: Platform integration

Target Kernels

• Linux 6.6.0 and newer
• Tested on: 6.6.1
• Architecture: x86_64

Installation

1. Apply the Patch

cd /path/to/kernel-source
patch -p1 < intel-ipu4-drivers-kernel-6.6.patch

2. Configure Kernel

make menuconfig

Navigate to:

Device Drivers →
  Multimedia support →
    Media PCI Adapters →
      [M] Intel IPU4 camera drivers
    Media I2C Adapters →  
      [M] CRL module sensor framework
      [M] DW9714 VCM driver
    Media platform devices →
      [M] Intel IPU4 ACPI support

3. Build Kernel

make -j$(nproc)
make modules_install
make install

4. Load Modules

modprobe intel-ipu4
modprobe intel-ipu4-isys
modprobe intel-ipu4-psys
modprobe crlmodule
modprobe dw9714

Verification

# Check modules loaded
lsmod | grep -E "(intel-ipu4|crlmodule|dw9714)"

# Check device nodes
ls -la /dev/intel-ipu4*

# Check kernel messages
dmesg | grep -i ipu4

Configuration Options

• CONFIG_VIDEO_INTEL_IPU4: Main IPU4 driver
• CONFIG_VIDEO_INTEL_IPU4_DEBUG: Debug interface
• CONFIG_VIDEO_INTEL_IPU4_ACPI: ACPI support
• CONFIG_VIDEO_CRLMODULE: Sensor framework
• CONFIG_VIDEO_DW9714: VCM actuator

Hardware Support

This driver supports Intel platforms with IPU4 hardware, including:

• Intel Broxton platforms
• Various Intel camera-enabled systems

Modern Kernel Features Used

• timer_setup() API (replaces init_timer)
• Modern get_user_pages() API
• access_ok() without type parameter
• media_entity_pads_init() API
• class_create() without owner parameter
• Direct timestamp assignment for V4L2 buffers

Troubleshooting

1. Module not loading: Check dmesg for error messages
2. Device not found: Verify hardware compatibility
3. Permission denied: Check udev rules for device nodes
4. Build errors: Ensure all dependencies are enabled

Support

This is a modernized version of the Intel IPU4 drivers. For hardware-specific issues, consult your platform documentation.