Low Power Display on i.MX 93

[#1]

• Hardware
  • i.MX 93 EVK​
  • TFT LCD 480x272 RGB888 (NV3047E, parallel)​
• Condition
  • A55 off​
  • DDR self-refresh​
  • OCRAM for framebuffer, TCM for code/data​
  • LCDIF on with parallel interface​
  • M33 update panel content each second​
  • 255KB single frame buffer(RGB565) (fit in OCRAM: 0x20480000 ~ 0x204DFFFF)​
• Code
  • Bitbucket：ssh://[email protected]/mpucnse/imx93-cm33-usecase.git​
  • Branch: imx93_sdk_2.14.1-lcd_on_ocram​
  • Demo code: imx93-cm33-usecase/boards/mcimx93evk/demo_apps/lcd_on_ocram​
  • DTS: imx93-cm33-usecase/boards/mcimx93evk/demo_apps/lcd_on_ocram/dts​
• Working Flow

• ​Test Flow
  • In uboot console,​
    1. setenv mmcargs $mmcargs clk-imx93.mcore_booted​
    2. setenv fdtfile imx93-11x11-evk-lcd_panel.dtb​
    3. fatload mmc 1:1 0x80000000 sdk20-app.bin;cp.b 0x80000000 0x201e0000 0x10000;bootaux 0x1ffe0000 0​
    4. boot​
  • In kernel console,​
    1. echo mem > /sys/power/state​
    2. start the power test
• Power Consumption
  • SoC power: 94.4mW​
  • [email protected]​
  • CM33@100MHz​
  • CM33@100MHz​
  • A55 suspend​
  • DDR retention​
  • WAKEUPMIX off​
  • NICMIX and MEDIAMIX on​

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