On 11/30/25 5:01 AM, Chaoyi Chen wrote: > On 11/29/2025 5:50 PM, Cristian Ciocaltea wrote: >> Hi Chaoyi, >> >> On 11/29/25 5:49 AM, Chaoyi Chen wrote: >>> Hello Cristian, >>> >>> On 11/28/2025 5:44 PM, Cristian Ciocaltea wrote: >>>> The precision was something I initially looked into for CRC verification, >>>> in the >>>> context of the related IGT test. But since I've added the VKMS support, I >>>> think >>>> we should not worry about that anymore. >>>> >>>> Moreover, as already pointed out in [1], only RK3576 supports CRC >>>> generation at >>>> display controller level, and that is not particularly useful because it >>>> doesn't >>> >>> I believe you can get the CRTC CRC on the RK3576, even when only the >>> background is visible and all plane is disabled. Feel free to let me >>> know if you run into any issues :) >> >> Yes, CRTC CRC works on RK3576 for the planes, but not for the background, >> i.e. >> the CRC is not updated when setting a different background color. Unless >> there's a way to change this default behavior, which I'm not aware of. >> >> My current understanding is that the background color is applied at a later >> stage in the display pipeline, *after* blending the planes and computing CRC. >> > > Which CRTC are you using? If you're using VP0, you might run into this > problem. Please try VP1 instead.
Yeah, that's VP0 as there's only one HDMI output port on my Radxa ROCK 4D board. I'll check if it's possible to switch to VP1.
