Hi Satyajit, That makes sense for the 8-bit normalization. Thank you for testing the patch on your equipment.
On Mon, Aug 10, 2026 at 12:05 PM <[email protected]> wrote: > > Hi Nathan, > > Thanks for catching the normalization issue. > > I initially used 8-bit normalization because the mode I was debugging was > 3840x2160@60 YCbCr 4:4:4 at 8 bpc, and I incorrectly tied the CSC > normalization to the output link bit depth. Your 10-bit normalization is > correct. > > I built and tested your first patch, "[PATCH 1/2] drm/amd/display: fix > BT.2020 YCbCr limited output CSC matrix", on Navi33 / DCN 3.2.1 over HDMI to > an LG CX with BT.2020/PQ HDR. The limited-range path works correctly with the > corrected matrix and fixes the incorrect HDR levels and color I was seeing > with the original matrix. > > I also confirmed that the resulting amdgpu module contains the corrected > limited-range coefficients from that patch. My hardware testing was limited > to the DCN limited-range path. > > Tested-by: Satyajit Roy [email protected] > > Thanks, > Satyajit
