Low Power Display on i.MX 93

1 Kudo

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://git@bitbucket.sw.nxp.com/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
- VDD_SOC@0.8V
- CM33@100MHz
- CM33@100MHz
- A55 suspend
- DDR retention
- WAKEUPMIX off
- NICMIX and MEDIAMIX on