Nouveau only ever outputs full-range RGB on HDMI. This series adds the
standard "Broadcast RGB" and "color format" connector properties on
Turing to Ada heads and selects the pixel encoding together with the
link depth: limited or full range RGB, and YCbCr 4:4:4, 4:2:2 and 4:2:0.
It applies on top of the HDMI Deep Color series v2 (base and
prerequisite ids below).
The hardware stage was already there. On NVC57D-class heads the final
colour conversion is HEAD_SET_PROCAMP plus the OCSC1 matrix and the
output clamp ranges; nouveau only wrote PROCAMP, hardcoded to RGB/VESA
under a TODO. The programming follows NVIDIA's open NVKMS on the same
classes (EvoSetProcAmpC5, EvoSetOCsc1C5, the YUV420PACKER head control).
The OCSC1 matrices are the ITU-R BT.601, BT.709 and BT.2020 coefficients
at limited-range scale; re-derived independently, they match NVIDIA's
register values to within 4 in the last place, and the patch uses
NVIDIA's values so the output is bit-identical to the proprietary driver
on the same hardware.
Selection policy follows drm_hdmi_state_helper.c, with amdgpu as the
reference consumer of the "color format" property: sink rules per
format (RGB/4:4:4 Deep Color bits, 4:2:2 up to 12 bpc in the 24-bit
container, 4:2:0 through its own bits), TMDS character rates from
drm_hdmi_compute_mode_clock(), "Automatic" picking RGB and falling back
to 4:2:0, explicit requests honoured or refused. YCbCr is limited range
with the CTA-861 default colorimetry (BT.709 above 576 lines, BT.601
below), declared in the AVI InfoFrame together with the pixel encoding.
One default changes: "Broadcast RGB" Automatic selects limited range for
CE video formats, as i915 and the HDMI helpers do. Today nouveau sends
full-range pixels there and can only declare that to sinks with a Video
Capability Data Block, so sinks without one apply their default limited
range to full-range data. "Full" restores the previous output.
1: NVC57D output CSC and clamp methods (class header)
2: program PROCAMP/OCSC1/clamps from head state (no functional change)
3: Broadcast RGB
4: color format with YCbCr 4:4:4 and 4:2:2
5: YCbCr 4:2:0 on GA102+, gated per head on the capability notifier
6: the same properties on DVI connectors, which carry HDMI to HDMI
sinks through passive adapters (reported by the automated review
of the Deep Color series v1)
Tested on a GA106 (RTX 3060) driving a Sony KDL-46HX855 (HDMI 1.4,
YCbCr 4:4:4 and 4:2:2, DC_30/DC_36/DC_Y444, 225 MHz, no VCDB), 25
configurations in two runs: RGB full, limited and automatic at 8/10/12
bpc; YCbCr 4:4:4 and 4:2:2 at 8/10/12 bpc; BT.601 at 576p/480p and
BT.709 from 720p; 640x480 held at 8 bpc; and side-by-side, top-and-
bottom and frame-packed 3D at 12 bpc with YCbCr 4:4:4, limited RGB and
YCbCr 4:2:2. Every frame carried colour bars over near-black and
near-white steps; the sink accepted each signal and displayed correct
colours and levels, and the driver's selection was logged per step.
Not tested here: 4:2:0 (the sink declares none) and DVI (the board has
no DVI port); both reuse the paths exercised above. Volta keeps its
current behaviour (NVKMS has no Volta display code to compare against)
and Blackwell (NVCA7D, same methods at a different stride) is left for
a follow-up. The class header additions are verbatim subsets of
NVIDIA's headers and carry their usual checkpatch style findings.
Normative chain: HDMI 1.4b section 6.5 (pixel encodings, General Control
Packet), HDMI 2.0 section 7.1 (YCbCr 4:2:0), CTA-861 (AVI InfoFrame
Y/C/Q/YQ fields, default colorimetry, the QS rule), ITU-R BT.601,
BT.709 and BT.2020. Bench harness and logs:
https://github.com/danielcamposramos/sony-bravia-linux (tools/stereo-modeset,
run27 and run28); curated public indexes:
https://github.com/danielcamposramos/awesome-linux-hdr and
https://github.com/danielcamposramos/awesome-stereoscopy.
AI partners were leveraged in the production of this work.
Daniel Campos Ramos (6):
drm/nouveau: add NVC57D output CSC and clamp range methods
drm/nouveau: program head output conversion for limited range and
YCbCr
drm/nouveau: add the Broadcast RGB property for HDMI
drm/nouveau: add HDMI YCbCr 4:4:4 and 4:2:2 output
drm/nouveau: add HDMI YCbCr 4:2:0 output on GA102 and later
drm/nouveau: expose HDMI output properties on DVI connectors
drivers/gpu/drm/nouveau/dispnv50/atom.h | 11 +
drivers/gpu/drm/nouveau/dispnv50/disp.c | 305 +++++++++++++++---
drivers/gpu/drm/nouveau/dispnv50/head.c | 19 ++
drivers/gpu/drm/nouveau/dispnv50/head.h | 3 +
drivers/gpu/drm/nouveau/dispnv50/headc57d.c | 112 +++++--
.../drm/nouveau/include/nvhw/class/clc57d.h | 34 ++
.../drm/nouveau/include/nvhw/class/clc673.h | 17 +
.../drm/nouveau/include/nvhw/class/clc67d.h | 16 +
drivers/gpu/drm/nouveau/nouveau_connector.c | 48 ++-
9 files changed, 488 insertions(+), 77 deletions(-)
create mode 100644 drivers/gpu/drm/nouveau/include/nvhw/class/clc673.h
create mode 100644 drivers/gpu/drm/nouveau/include/nvhw/class/clc67d.h
base-commit: 73ef663c75688168e31dbe9c585b939be410a945
prerequisite-patch-id: 6bd193908862475dd809b40037984747467236d6
prerequisite-patch-id: bf3b51b5393ef1c612930f4c474e6852372ca7db
prerequisite-patch-id: 22c3f84b6576853e9d3053d4e5a15a4bd37e6dcd
--
2.53.0
