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DS90UB941AS-Q1: 941 948 pg都有显示，现在关掉pg，直接使用外部dsi clk data，无显示

jianlin fu
Part Number: DS90UB941AS-Q1

941 948 pg都有显示，现在关掉pg，直接使用外部dsi clk data，无显示，

发现941没有检测到dsi clk和pclk，使用外部dsi，941有什么特地的配置吗？

下面是941 948 reg dump：

dsi.txt
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34 00 00 9a 00 00 58 00 00 01 9d 04 03 30 00 00
00 00 00 8f 00 00 fe 9e 7f 7f 01 00 00 00 01 00
03 00 25 00 00 00 00 00 01 20 20 a0 00 00 a5 5a
00 09 00 05 0c 00 00 00 00 00 00 00 00 00 81 02
10 90 00 00 00 00 00 00 00 00 00 00 00 00 00 8c
16 00 00 00 02 10 00 02 00 00 92 01 07 06 44 00
22 02 00 00 10 00 00 00 00 00 00 00 00 00 20 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 82 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 82 00 78 00 00 44 40 00 00 00 00 02 ff 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 82 00 68 08 00 00 00 00 00 00 00 02 00 00
5f 55 42 39 34 31 00 00 00 00 00 00 00 00 00 00
//948
58 04 00 f0 fe 9e 00 34 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 01 00 00 22 13 53 09
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

  • 0
    TI__Guru**** 295050 points

    您好，关掉PG。使用外部DSI data，不显示，那么是否用示波器测量下948的输出是否有波形？

    或者948输入是否有波形？

  • 0 回复 Kailyn Chen

    现在关掉pg，直接用外部dsi clk 和video，目前941也都检测dsi信号正常，pclk也有，948也lock，但是没有显示，实际测试dsi video也是有的，这块还要排查哪些？目前验证最简硬件配置：dsi-941-948-1920*720panel，single link模式，目前dsi ia reg都是用默认值，有没有这种配置下的r参考eg setting？谢谢。

  • 0 回复 jianlin fu
    TI__Guru**** 295050 points

    您读取下状态寄存器0x1C的值看看是多少？如果0x1C的值都正常，那应该不是941或948的问题。

  • 0 回复 Kailyn Chen

    948 0x1c 值为0x23,全部941 、948 reg dump如下

    7838.dsi.txt
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    34 00 00 9a 00 00 58 00 00 01 0a 00 67 30 00 00
    00 00 00 8f 00 00 fe 9e 7f 7f 01 00 00 00 01 00
    03 00 25 00 00 00 00 00 01 20 20 a0 00 00 a5 5a
    00 09 00 05 0c 00 00 00 00 00 00 00 00 00 81 02
    10 90 00 00 00 00 00 00 00 00 00 00 00 00 00 8c
    16 00 00 00 02 10 00 02 00 00 d9 01 07 06 44 71
    22 02 00 00 10 00 00 00 00 00 00 00 00 00 20 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 82 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00 00 82 00 78 00 00 44 40 00 00 00 00 02 ff 00
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00 00 82 00 68 08 00 00 00 00 00 00 00 02 00 00
    5f 55 42 39 34 31 00 00 00 00 00 00 00 00 00 00
    //948
    58 04 00 f0 fe 9e 00 34 00 00 00 00 00 00 00 00
    00 00 00 00 00 00 00 00 00 01 00 00 23 13 53 09
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

  • 0 回复 Kailyn Chen

    你好，上面寄存有问题吗？现在只是背光亮了，dsi发的test bar没有显示

  • 0 回复 jianlin fu
    TI__Guru**** 295050 points

    0x1C 的值是0x23，可以bit5=1 读取的是dual link  mode，而bit4是0， 又为single link mode，这里矛盾了。 硬件您是怎么接的？

    另外就是bit3=0，: I2S PLL controller not locked。

  • +1 回复 Kailyn Chen

    941 dout0 -> 948 D0-D7 -> panel,所以对于948 receiver 是single link mode,transmitter 是duallink OpenLDI,

    我这样理解对吗? 这个寄存器941 内部pg正常显示也是0x23.

    I2S因为我们没有用到音频,这个有关系吗?请帮忙再检查下941 948 dump寄存器,谢谢

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