[PATCH 7.2.y] drm/amd/display: Propagate HDMI RGB quantization selectability

[Sasha Levin <sashal@kernel.org>]

From: Satyajit Roy <sroy14@alum.utk.edu>

[ Upstream commit bdcd0411d7d186225a52458fd42bb70d54ca917a ]

DC uses dc_edid_caps.qs_bit when constructing the HDMI AVI InfoFrame
quantization-range field. Although DRM parses the sink capability into
drm_display_info, DM never copies it into the DC EDID capabilities. The
field therefore remains zero and the AVI quantization range stays at its
default value.

Copy rgb_quant_range_selectable for HDMI sinks and extend the existing
EDID-capability KUnit test to cover it.

Fixes: 6eb4c13a3845 ("drm/amd/display: Support "Broadcast RGB" drm property")
Signed-off-by: Satyajit Roy <sroy14@alum.utk.edu>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 892659399f64642e33072562a11ec1b2e7bd2263)
Cc: stable@vger.kernel.org
[ Omitted KUnit test additions because amdgpu_dm_helpers_test.c and its supporting infrastructure are absent. ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index 41aa8f9bb152b..fe5b97e6f9603 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -197,6 +197,7 @@ enum dc_edid_status dm_helpers_parse_edid_caps(
 	edid_caps->edid_hdmi = connector->display_info.is_hdmi;
 
 	if (edid_caps->edid_hdmi) {
+		edid_caps->qs_bit = connector->display_info.rgb_quant_range_selectable;
 		populate_hdmi_info_from_connector(link->dc->config.enable_frl, &connector->display_info.hdmi, edid_caps);
 		drm_dbg_driver(connector->dev, "%s: HDMI_FRL [%s] max_frl_rate %d\n", __func__, connector->name, edid_caps->max_frl_rate);
 		if (edid_caps->frl_dsc_support)
-- 
2.53.0