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Ten thousand LCD panels passed Incoming Quality Control. Firmware injection began. Production stopped. During the development of our next-generation Automated Fare Collection (AFC) machines, we qualified multiple LCD vendors, designed a custom MIPI DSI touchscreen panel, developed display and peripheral drivers, and prepared for mass production. Everything worked—until firmware flashing began. Devices that previously functioned flawlessly suddenly booted to dead displays. The same firmware image now failed across the line. The root cause wasn’t firmware. It wasn’t hardware failure. It was a silent vendor-side change: the LCD panel driver IC had been swapped for a different silicon revision—without changing the panel model. The Linux DRM panel framework assumes static hardware described in the Device Tree. Manufacturing does not. MIPI DSI panel drivers are based on LCD model types not Display IC model types. This talk presents a real-world production failure and the redesign that followed: replacing static panel definitions with runtime detection of display controller ICs via MIPI DCS, dynamic initialization sequencing, and a more resilient driver architecture.
Ram is a Senior Software Engineer at JFrog R&D . Previously worked for startup companies like CallidusCloud (SAP Company), Konylabs. Loves Automation, Linux, openSource
Embedded Linux professional and electronics hobbyist with experience in Linux driver development, kernel programming, system software and Edge AI. Linux kernel contributor in device driver space. Enjoy working with hardware and technology space.
