diff mbox series

[RFC,v2,08/18] drm/amd/display: add comments to describe DM crtc color mgmt behavior

Message ID 20230109143846.1966301-9-mwen@igalia.com (mailing list archive)
State New, archived
Headers show
Series Add DRM CRTC 3D LUT interface | expand

Commit Message

Melissa Wen Jan. 9, 2023, 2:38 p.m. UTC 
Describe some expected behavior of the AMD DM color mgmt programming.

Signed-off-by: Melissa Wen <mwen@igalia.com>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)
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Patch

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 10a29d131424..b54ef1392895 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
@@ -428,12 +428,23 @@  int amdgpu_dm_update_crtc_color_mgmt(struct dm_crtc_state *crtc)
 		stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
 		stream->out_transfer_func->tf = TRANSFER_FUNCTION_SRGB;
 
+		/* Note: even if we pass has_rom as parameter here, we never
+		 * actually use ROM because the color module only takes the ROM
+		 * path if transfer_func->type == PREDEFINED.
+		 *
+		 * See more in mod_color_calculate_regamma_params()
+		 */
 		r = __set_legacy_tf(stream->out_transfer_func, regamma_lut,
 				    regamma_size, has_rom);
 		if (r)
 			return r;
 	} else if (has_regamma) {
-		/* If atomic regamma, CRTC RGM goes into RGM LUT. */
+		/* 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;