Apr 2019 – Mar 2022 · 2 yrs 11 mos · Bengaluru, Karnataka, India

• Fixed Display's DP MST to USB type-C connector's hotplug related issues in i915 display driver
• Exposure on DRM Subsystem w.r.t Display module, i915 Display frameworks & Display Panel(1080p@60Hz) bringups w.r.t connectors side(MIPI-DSI) ; IGT tests (kms_flip, kms_cursor_crc, kms_cursor_legacy, kms_sequence, kms_setmode, kms_vblank, test_display.c) for Display on SoC side.
• Bug fixing in Linux i915 GPU driver/IGT w.r.t Ring buffer Command Submissions to GPU - contributed to DRM i915(embargoed) & Open source for Server and Client products (Discrete GPU's - Ponte Vecchio(Xe-HPG)-2T, Arctic Sound(Xe-HPSDV)-2T, DG2(Xe-HPG), DG1(Xe-LPG)) for customers like Argonne, DELL etc.,
• Patches in Upstream Linux Kernel:
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/?qt=author&q=srinivasan+shanmugam&&?qt=author&q=srinivasan+s
• Patches at #intel-gfx:
• https://patchwork.freedesktop.org/series/69980/#rev5
• https://patchwork.freedesktop.org/patch/450059/?series=93706&rev=1
• Porting feature ”Dynamically power gating the EU’s on intel GPUs" for power saving benefit https://patchwork.freedesktop.org/series/69980/#rev5 on Comet Lake & Jasper Lake platforms– with power saving benefit of ~90mW for Chrome Workloads - Hangout & Youtube.
• Design analysis done for Porting "Zero-copy" feature in ChromeOS - to eliminate CPU processing (by avoiding memory copies using DMA-BUF in kernel driver - instead of using mmap & by sharing the same file descriptor - across various video paths - Camera capture, video encoding/decoding & rendering to Display & by avoiding intermediate color format conversion from 3 plane-I420 YUV to 2 plane-NV12 YUV) - highly exercised during Hangout video calls, with a benefit of reducing CPU load ~5-10% (on Eve) & power savings by ~100mW on CML & JSL.
• Ported FFmpeg tool in ChromeOS, for bringup of HW Video encoders & decoders (Vp9, H.264 & Vp8) up and running on JSL platform (Jira - CHRMOS-7374)

Oct 2018 – Mar 2019 · 5 mos · Berlin Metropolitan Area

•  Board bring-up - custom modifications in Linux Kernel 4.14 and U-boot on i.MX8M processor for inbuilt Computer based digital audio workstation - Traktor (Evaluation) product.
•  Creating Yocto meta layers, Custom Distro images by editing layers.conf, bblayers.conf & local.conf, adding recipes to layers for Customized Embedded Linux platform
•  Audio codec (I2S), Ethernet PHY, Wi-Fi and Bluetooth bringup of SoC connected Peripherals in Linux custom i.MX8M platform by modifying device tree configurations
•  Implemented Built-in Self-Tests using Python for SoC connected Peripherals - SD, eMMC, BT, Wi-Fi, USB-OTG - to measure performance - For Custom Board (x86- Apollolake) in factory production - Standalone MASCHINE MK3 product.
• https://github.com/SrinivasanShanmugam1311/Python-Skills-Linux-SoC-Peripheral-Selftests/tree/main/dvt2/self_tests/test_library
•  Reviewing other's pull requests related to platform software
•  C, shells (sh/bash), Python(beginners level), SVN, GIT

Oct 2014 – Jun 2018 · 3 yrs 8 mos · Bangalore, India

•  Board bring-up on custom hardware design - Linux Kernel 4.9 and U-boot on i.MX6ULL for IP Speaker Security systems (POE - Power over Ethernet) for Smart city and Building management (ASL– UK)
•  Added TLV320AIC Audio Codec driver & Machine driver Support on i.MX6ULL Custom Platform, fixed MCLK and Audio Routing issues in linux.
•  Bringup of NAND Flash on i.MX6ULL Custom Platform in linux
•  Creating Yocto meta layers, custom distro images, recipes for customized i.mx6ull embedded linux platform
•  Board bring-up on custom hardware design - Porting Linux Kernel 4.9 and U-boot on Xilinx Zynq 7000 processor based on custom hardware GNSS product for Highly Automated Driving (HAD) system (On-site- U-blox – Switzerland)
•  Measurement Engine Communication Protocol development via Linux SPI interface driver for GNSS chips manufactured by U-blox.
•  Board bring-up on custom hardware design - Linux kernel 3.14 and U-boot customization's on TI AM335x based Telecare product (On-site- Tunstall Health Care - UK)
•  Audio codecs bring-up (MAXIM-MAX9860, NXP-UDA1345TS) , Ethernet PHY (TI-DP83848) bring-up, Wi-Fi and Bluetooth (Wl1831) integration into the Linux custom AM3352 platform
•  Optimized Linux boot time, Power management optimization on SoC/CPU side, Implemented Secure boot & Signing Mechanism using private keys and public keys in u-boot & linux kernel for Custom Linux BSPs
•  Implemented Shell Scripts for Linux Security Hardening - For Avaya customer
•  C, shells (sh/bash), Yocto, Buildroot, SVN

May 2012 – Oct 2014 · 2 yrs 5 mos · Bangalore, India

•  Board bring-up on custom hardware design - Porting Linux kernel 2.6 and U-boot bootloader development - with custom modifications on Freescale I.MX28 based Infotainment product for Cruise - Designed for Clarion Corporation of America
•  Multichannel Audio codec (STA309A), SGTL5000 and Audio Amplifier( TDA7563B) bring-up on Freescale I.MX28 custom platform.
•  Enhancement and bring-up/Porting of 8MP OV8825 (Bayer-10bit) sensor for Primary camera and OV9740 (720p) for Secondary camera on Intel-XGOLD632 for Mobile product - For Intel Mobile Communications
•  LCD panel (innolux_at70_tn83) bring-up in Android Jellybean/Linux kernel 3.2.0 on TI-OMAP4430 for Mobile product
•  Porting Android Little kernel bootloader & mainline Linux kernel (3.0 to 3.3), init - custom Qualcomm-MSM8x55 SURF platform – Android ICS - Mobile Product
•  Created and set up from scratch the embedded Linux OS / BSP on ARM 920T (Buildroot, Busybox, kernel 2.6.28)

Aug 2011 – Apr 2012 · 8 mos · Bangalore, India

•  Board bring-up on custom hardware design - Porting Android BSP’s, Designed and Implemented Android based RFID Hand Held Reader product for Asset Tracking - Designed for IBM Solutions
•  Integrating the Wi-Fi module with I.MX53 QSB & building Android 2.3.4 & configuring FTDI USB-Serial driver in Linux kernel configuration file for receiving RFID Tag data from AS3992(AMS RFID reader) & transmitting the data through Wi-Fi module.
•  Configuring the Wi-Fi module through AT commands via UART interface in i.MX53 QSB.
•  Transmitting & Receiving the data through TCP/IP protocol between Redpine Wi-Fi module & Android i.MX535 QSB.
•  Developed application in C for the configured USB-Serial driver by using FTDI library according to the data sheet provided by FTDI chip.
•  Transmitting & Receiving the data through USB-Serial interface between AS3992(AMS RFID Reader) & Android i.MX535 QSB.