[PATCH] drm/sun4i: mixer: fix scanline for V3s and D1

[benlypan at gmail.com]

Hi Jernej!

> Which SDK? All SDKs that I have or found on internet don't mention YUV nor RGB
> scanline limit. That doesn't mean there is none, I'm just unable to verify
> your claim. Did you test this by yourself? Also, please make YUV scanline
> change separate patch with fixes tag.

Here is the code about scanline config for V3s:
https://github.com/Tina-Linux/tina-v3s-linux-4.9/blob/master/drivers/video/fbdev/sunxi/disp2/disp/de/lowlevel_sun8iw8/de_feat.c#L55
https://github.com/Tina-Linux/tina-v3s-linux-4.9/blob/master/drivers/video/fbdev/sunxi/disp2/disp/de/lowlevel_sun8iw8/de_rtmx.c#L1212

And here is for D1:
https://gitlab.com/weidongshan/tina-d1-h/-/blob/main/lichee/linux-5.4/drivers/video/fbdev/sunxi/disp2/disp/de/lowlevel_v2x/de_feat.c#L182
https://gitlab.com/weidongshan/tina-d1-h/-/blob/main/lichee/linux-5.4/drivers/video/fbdev/sunxi/disp2/disp/de/lowlevel_v2x/de_rtmx.c#L1588

I was tested it on V3s. Without this patch, the plane will not display
correctly if src_w large than 1024, for both YUV and RGB. I don't have a
device with D1, so D1 is not tested. But according to the SDK code of D1,
the scanline value of mixer1 is 1024.

I'm new to submitting patches, So may I ask a question? If there is no
problem with this patch, what I need to do is to send new patches as you
suggested?

Best regards,
Genfu Pan