cm4核接lvds屏显示图片有锯齿

[957992093]

   您好：

         使用IMX8Q的cm4核外接lvds双通道屏，显示出现锯齿，怀疑是lvds通道的奇偶像素设置反了，请问那个寄存器是设置奇偶像素位的？

[smarter]

Hi jimmychan,

    Use this patch, my camera work well at m4 side,but it not work well at Android 9.2.3.5 auto car config, in this config , evs is used . my issue log is :

arm-smmu 51400000.iommu: Unhandled context fault: fsr=0x402, iova=0xaebbc000, fsynr=0x30001, cb=0

I check it ,the problem  is something wrong with  resource  dpr-channel@570f0000,  remove it at scfw and mcu sdk , this log is not exist. but camera image display is go bad. how can I resolve this issue?

[957992093]

感谢您的回复：

   我们也发现不是奇偶像素问题，当lvds从单路模式改成split模式dpu需要有什么样的更改呢，我们配置的分辨率是1920实际显示的是他的2倍宽度，那么另外一半的像素数据从哪里获取的呢，还是dpu需要配置相应寄存器修改。

   谢谢！

[jimmychan]

Since Android is OK for the display, I think the issue is caused by only one LVDS port had sent out data.

Note: When turning on split mode, only PHY clock should be divided by 2, others clocks need to be kept unchanged.

For your reference. Attached a reference patch for iMX8QM MEK.

[957992093]

8qm，现在我们发现用这种方式填充完后显示的是紫色，不是红蓝相间，请问dpu需要配置那个寄存器么，实现双lvds显示，请直接回答问题，谢谢！

[jimmychan]

On iMX8QM, for dual channel LVDS panel, port 0 is for first pixel and port 1 is for second pixel, it can't be switched.

So customer should connect the correct LVDS port between panel and iMX8QM.

[957992093]

您好：

   我使用的是android9.0_2.1版本系统里的sdk，板子是我们自己的，现在android端显示正常没有锯齿，cm4核端显示出现锯齿，不知道锯齿产生是那个寄存器设置问题，用得芯片是imx8q b0版本，请问怎么设置lvds屏显示的奇偶通道，还有什么原因能导致图像显示有锯齿。

[jimmychan]

i.MX8qxp? or i.MX8qm?

[jimmychan]

Could you tell me which board are you using?

Which version SDK or BSP are you using?

What is the part number of the i.MX8 you used?