We are introducing DRM 3D LUT property to DM color pipeline in the next
patch, but so far, only for atomic interface. By checking
.set_output_transfer_func in DC drivers with MPC 3D LUT support, we can
verify that regamma is only programmed when 3D LUT programming fails. As
a groundwork to introduce 3D LUT programming and better understand each
step, detach atomic regamma programming from the crtc colocr updating
code.
Signed-off-by: Melissa Wen <mwen@xxxxxxxxxx>
---
.../amd/display/amdgpu_dm/amdgpu_dm_color.c | 52 ++++++++++++-------
1 file changed, 33 insertions(+), 19 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 b54ef1392895..54d95745f0f0 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
@@ -291,6 +291,36 @@ static int __set_output_tf(struct dc_transfer_func *func,
return res ? 0 : -ENOMEM;
}
+static int amdgpu_dm_set_atomic_regamma(struct dc_stream_state *stream,
+ const struct drm_color_lut *regamma_lut,
+ uint32_t regamma_size)
+{
+ int ret = 0;
+
+ if (regamma_size) {
+ /* CRTC RGM goes into RGM LUT.
+ *
+ * Note: here there is no implicit sRGB regamma. We are using
+ * degamma calculation from color module to calculate the curve
+ * from a linear base.
+ */
+ stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
+ stream->out_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;
+
+ ret = __set_output_tf(stream->out_transfer_func, regamma_lut,
+ regamma_size);
+ } else {
+ /*
+ * No CRTC RGM means we can just put the block into bypass
+ * since we don't have any plane level adjustments using it.
+ */
+ stream->out_transfer_func->type = TF_TYPE_BYPASS;
+ stream->out_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;
+ }
+
+ return ret;
+}
+
/**
* __set_input_tf - calculates the input transfer function based on expected
* input space.
@@ -438,27 +468,11 @@ int amdgpu_dm_update_crtc_color_mgmt(struct dm_crtc_state *crtc)
regamma_size, has_rom);
if (r)
return r;
- } else if (has_regamma) {
- /* CRTC RGM goes into RGM LUT.
- *
- * Note: here there is no implicit sRGB regamma. We are using
- * degamma calculation from color module to calculate the curve
- * from a linear base.
- */
- stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
- stream->out_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;
-
- r = __set_output_tf(stream->out_transfer_func, regamma_lut,
- regamma_size);
+ } else {
+ regamma_size = has_regamma ? regamma_size : 0;
+ r = amdgpu_dm_set_atomic_regamma(stream, regamma_lut, regamma_size);
if (r)
return r;
- } else {
- /*
- * No CRTC RGM means we can just put the block into bypass
- * since we don't have any plane level adjustments using it.
- */
- stream->out_transfer_func->type = TF_TYPE_BYPASS;
- stream->out_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;
}
/*
--
2.35.1
