[RFC PATCH 29/40] drm/amd/display: add CRTC shaper TF support

[Melissa Wen]

Inspired by regamma TF, follow similar steps to add TF + 1D LUT for
shaper func. Reuse gamma_tf property, since the driver doesn't support
shaper and out gamma at the same time. We could rename gamma_tf, if
necessary to avoid misunderstandings, or add a specific property for
shaper lut.

Signed-off-by: Melissa Wen <mwen at igalia.com>
---
 .../drm/amd/display/amdgpu_dm/amdgpu_dm_color.c  | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
index 6e7271065a56..6a233380f284 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
@@ -470,19 +470,22 @@ static void amdgpu_dm_atomic_lut3d(const struct drm_color_lut *drm_lut,
 }
 
 static int amdgpu_dm_atomic_shaper_lut(const struct drm_color_lut *shaper_lut,
+				       bool has_rom,
+				       enum dc_transfer_func_predefined tf,
 				       uint32_t shaper_size,
 				       struct dc_transfer_func *func_shaper)
 {
 	int ret = 0;
 
-	if (shaper_size) {
+	if (shaper_size || tf != TRANSFER_FUNCTION_LINEAR) {
 		/* If DRM shaper LUT is set, we assume a linear color space
 		 * (linearized by DRM degamma 1D LUT or not)
 		 */
 		func_shaper->type = TF_TYPE_DISTRIBUTED_POINTS;
-		func_shaper->tf = TRANSFER_FUNCTION_LINEAR;
+		func_shaper->tf = tf;
+		func_shaper->sdr_ref_white_level = 80; /* hardcoded for now */
 
-		ret = __set_output_tf(func_shaper, shaper_lut, shaper_size, false);
+		ret = __set_output_tf(func_shaper, shaper_lut, shaper_size, has_rom);
 	} else {
 		func_shaper->type = TF_TYPE_BYPASS;
 		func_shaper->tf = TRANSFER_FUNCTION_LINEAR;
@@ -509,12 +512,14 @@ static int amdgpu_dm_atomic_shaper_lut3d(struct dc *dc,
 					 struct dc_stream_state *stream,
 					 const struct drm_color_lut *drm_shaper_lut,
 					 uint32_t drm_shaper_size,
+					 bool has_rom,
+					 enum dc_transfer_func_predefined tf,
 					 const struct drm_color_lut *drm_lut3d,
 					 uint32_t drm_lut3d_size)
 {
 	struct dc_3dlut *lut3d_func;
 	struct dc_transfer_func *func_shaper;
-	bool acquire = drm_shaper_size || drm_lut3d_size;
+	bool acquire = drm_shaper_size || drm_lut3d_size || tf != TRANSFER_FUNCTION_LINEAR;
 
 	lut3d_func = (struct dc_3dlut *)stream->lut3d_func;
 	func_shaper = (struct dc_transfer_func *)stream->func_shaper;
@@ -536,7 +541,7 @@ static int amdgpu_dm_atomic_shaper_lut3d(struct dc *dc,
 
 	amdgpu_dm_atomic_lut3d(drm_lut3d, drm_lut3d_size, lut3d_func);
 
-	return amdgpu_dm_atomic_shaper_lut(drm_shaper_lut,
+	return amdgpu_dm_atomic_shaper_lut(drm_shaper_lut, has_rom, tf,
 					   drm_shaper_size, func_shaper);
 }
 
@@ -735,6 +740,7 @@ int amdgpu_dm_update_crtc_color_mgmt(struct dm_crtc_state *crtc,
 		shaper_size = shaper_lut != NULL ? shaper_size : 0;
 		r = amdgpu_dm_atomic_shaper_lut3d(adev->dm.dc, ctx, stream,
 						  shaper_lut, shaper_size,
+						  has_rom, tf,
 						  lut3d, lut3d_size);
 		if (r) {
 			DRM_DEBUG_DRIVER("Failed on shaper/3D LUTs setup\n");
-- 
2.39.2