02-07-2019, 03:22 PM
(02-06-2019, 02:46 PM)chithanh Wrote: <...>
However, I looked in the RK3399 datasheet (v1.8) afterwards, and while DP indeed supports 4K@60Hz, the eDP PHY is reported as limited to 2.7 Gbps/lane. That would not be sufficient for 4K/UHD, maybe barely for WQHD+. Can I get some clarification what is the maximum bandwidth/resolution for the internal panel?
Point 1.2.13 of this document? https://github.com/rockchip-linux/docs/b...180529.pdf
The exact quote is "Up to 4 physical lanes of 2.7/1.62 Gbps/lane"
If all 4 lanes were hooked up that's 10.8gbit/s which is enough for 75Hz 2560x1440, see https://en.wikipedia.org/wiki/DisplayPor...ncy_limits
The other reasonable number of lanes to have hooked would be 2 and that could support 60Hz 1920x1080 so that's also an option.
I agree that clarification from Pine is needed as to the number of displayport lanes hooked up but I don't think 4K is a possibility for the internal panel. Ah well.