RK3588 MIPI Panel Debugging: RK3588-MIPI-DSI Panel Configuration
1. Introduction
- This article explains parameter configuration of MIPI panel debugging based on the RK3588.
2. Environment
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Hardware:
ArmSoM-W3 RK3588 dev board, MIPI-DSI panel (ArmSoM official accessory) -
Software:
OS: ArmSoM-W3 Debian11
3. Panel Parameter on DTS Configuration
- The timing sequence parameters for panel are as follows:
Signal Timing
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DTS Configuration：
disp_timings1: display-timings { native-mode = <&dsi1_timing0>; dsi1_timing0: timing0 { clock-frequency = <159400000>; hactive = <1200>; vactive = <1920>; hfront-porch = <80>; hsync-len = <1>; hback-porch = <60>; vfront-porch = <35>; vsync-len = <1>; vback-porch = <25>; hsync-active = <0>; vsync-active = <0>; de-active = <0>; pixelclk-active = <1>; }; };Analysis：
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Hactive:Horizontal active pixels
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Vactive:Vertical active pixels
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Horizontal total period Htotal = Hactive + hfront-porch +hsync-len + hback-porch
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Vertical total period Vtotal = Vactive + vfront-porch + vsync-len + vback-porch
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Clock-Frequency：It provided to the LCD , usually specified in the panel datasheet, which can also be calculated.
clock-frequency = Horizontal total * Vertical total * Frame rate：clock-frequency = （hactive + hfront + hsync-len + hback）* (vactive + vfront + vsync-len + vback) * fps -
Term analysis:
hactive: Horizontal resolution vactive: Vertical resolution hsync-len: Horizontal sync pulse width hback-porch: Back porch after HS pulse hfront-porch: Front porch before HS pulse vsync-len: Vertical sync pulse width vback-porch: Back porch after VS pulse vfront-porch: Front porch before VS pulse de-active: DE signal polarity hsync-active: HS signal polarity vsync-active: VS signal polarity hback-porch/hfront-porch/hsync-len: Horizontal sync signals vback-porch/vfront-porch/vsync-len: Vertical sync signals