PPAT - Power software Developer
3 days ago
PPAT – Power Software Developer
Experience: 4+ years
Key Responsibilities:
- Power Management Software Development
- Develop and optimise platform-specific power management features on SoCs (based on custom Oryon CPUs).
- Implement DVFS (Dynamic Voltage and Frequency Scaling), Sleep/Wake logic, and rail/clock gating across CPU, NPU, GPU, and DSP domains.
- Integrate with Power Management ICs (PMICs) and configure resource power managers (RPMh, RSC).
- Low Power Mode Enablement
- Enable platform deep sleep, suspend-to-idle, and system sleep states tailored for Always-On (AON) use cases.
- Validate retention/restore sequences of SoC subsystems and memory during low-power modes.
- Integrate SPMI-based communication with PMIC for power domain control.
- Thermal & Performance Scaling
- Develop and tune thermal mitigation policies using sensors and thermal zones.
- Interface with Battery Management System (BMS) and configure thermal trip points.
- Implement CPUFreq/DevFreq drivers with QoS-aware thermal throttling and performance caps.
- Power & Thermal Characterization
- Measure and optimize platform power (active and idle) using Trepn Profiler, QDART, QPST, and onboard fuel gauges.
- Perform power regression analysis across software releases and feature integrations.
- Work with system architects to define performance-per-watt KPIs for devices (AI laptops, edge compute systems).
- Firmware and Bootloader Integration
- Collaborate with UEFI/TF-A developers to manage early-stage power initialization.
- Coordinate with XBL, ABL, and UEFI teams for seamless handoff of power states to Linux/Windows OS.
- Debug & Bring-up Support
- Triage system-level power and thermal issues with QXDM, QPST, kernel logs, ftrace, trace32, JTAG.
- Work with silicon validation teams to debug board-level or SoC-level anomalies in power delivery or heat dissipation.
- Cross-Team Collaboration
- Partner with PMIC, platform, kernel, BSP, and thermal teams to co-design efficient power solutions.
- Support OEM/ODM partners in tuning and validating power features for commercial products (laptops, tablets).
- Contribute to system-level test plans and validations for power and thermal readiness at EVT/DVT stages.
Required Expertise:
- Qualcomm-Specific Knowledge
: RPMh, SPMI, TSENS, CPR (Core Power Reduction), Oryon CPUs, Hexagon DSPs, Adreno GPU, AI accelerators. - Tools
: QXDM, QPST, Trepn Profiler, QDART, Dragonboard/CRB. - OS & Driver Development
: C/C++ for Linux/Windows kernel (power/thermal subsystems), AOSP/Yocto PMIC & thermal drivers. - Power Profiling & Tuning
: Trepn, PowerTOP, ftrace, perf, RAPL-like interfaces. - Debugging
: Kernel/ADB/QXDM log analysis, JTAG, boot tracing, event timelines.
Preferred Qualifications:
- Experience with reference or commercial platforms.
- Linux on ARM64 & power management on ARM64 SoCs.
- Modern thermal management techniques for fanless laptops/ultrabooks.
- Exposure to AI performance-power optimisation (e.g., NPU scaling for LLM workloads).
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