Driver - Hisilicon Kirin 980

Technical Report: HiSilicon Kirin 980 Driver Architecture & Software Support

Subject: Analysis of Driver Support, Structure, and Availability for the HiSilicon Kirin 980 SoC Date: October 26, 2023 Target Audience: Developers, Mobile Technicians, and System Integrators

3. Kernel Source Availability

• Partial GPL releases exist for some Kirin 980 devices (e.g., Huawei P30 Pro, Mate 20 Pro).
• Notable missing components (binary blobs):
  • NPU firmware & driver
  • GPU kernel-side interface (mostly user-space blob)
  • Camera ISP tuning and algorithms
  • Secure world (Trusted Core) drivers

Method C: eRecovery Mode

• Turn off the phone → Connect to power + USB → Hold Volume Up + Power → Select "Download latest firmware and recover." This re-flashes the latest vendor image.

Issue 3: VoLTE or Wi-Fi Calling Not Working

• Cause: Modem driver mismatch (especially after cross-flashing firmware).
• Fix: Re-flash the correct modem_ram.img and modem_fw.img using IDT (Image Download Tool) or fastboot (if unlocked). Requires bootloader unlock.

4. Connectivity and Integrated Modems

• While some Kirin variants contain integrated modems, driver stacks vary by model and distribution (baseband firmwares often closed-source).
  • Modem drivers handle shared memory, protocol bridges (e.g., QMI-like), and secure control channels. Modem reset and power sequencing become critical for robust operation.
• WLAN/BT and GNSS are typically separate chips but integrated on shared busses (SDIO, SPI, USB); host drivers must coordinate power management and RF coexistence.