[PATCH 05/25] drm/amd/display: add support for chroma offset

[Rodrigo Siqueira]

From: Samson Tam <samson....@amd.com>

[Why]
Adding support for chroma subsampling offset (cositing) in scaler
calculations to adjust reference point where we determine post-scaling
chroma value in YUV420 surfaces.

[How]
Add support for cositing options: NONE, LEFT and TOPLEFT Add debug
option force_cositing and set default to TOPLEFT to maintain same
behaviour as without offset support.

Reviewed-by: Jun Lei <jun....@amd.com>
Acked-by: Rodrigo Siqueira <rodrigo.sique...@amd.com>
Signed-off-by: Samson Tam <samson....@amd.com>
---
 drivers/gpu/drm/amd/display/dc/dc.h          | 3 +++
 drivers/gpu/drm/amd/display/dc/dc_hw_types.h | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dc.h 
b/drivers/gpu/drm/amd/display/dc/dc.h
index 54534df73e83..188f2d401124 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -1003,6 +1003,7 @@ struct dc_debug_options {
        unsigned int static_screen_wait_frames;
        bool force_chroma_subsampling_1tap;
        bool disable_422_left_edge_pixel;
+       unsigned int force_cositing;
 };
 
 struct gpu_info_soc_bounding_box_v1_0;
@@ -1285,6 +1286,7 @@ struct dc_plane_state {
        struct tg_color visual_confirm_color;
 
        bool is_statically_allocated;
+       enum chroma_cositing cositing;
 };
 
 struct dc_plane_info {
@@ -1303,6 +1305,7 @@ struct dc_plane_info {
        int  global_alpha_value;
        bool input_csc_enabled;
        int layer_index;
+       enum chroma_cositing cositing;
 };
 
 #include "dc_stream.h"
diff --git a/drivers/gpu/drm/amd/display/dc/dc_hw_types.h 
b/drivers/gpu/drm/amd/display/dc/dc_hw_types.h
index 465e15f57f93..2ad7f60805f5 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_hw_types.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_hw_types.h
@@ -738,6 +738,13 @@ enum scanning_type {
        SCANNING_TYPE_UNDEFINED
 };
 
+enum chroma_cositing {
+       CHROMA_COSITING_NONE,
+       CHROMA_COSITING_LEFT,
+       CHROMA_COSITING_TOPLEFT,
+       CHROMA_COSITING_COUNT
+};
+
 struct dc_crtc_timing_flags {
        uint32_t INTERLACE :1;
        uint32_t HSYNC_POSITIVE_POLARITY :1; /* when set to 1,
-- 
2.43.0