drm/amd/display: Bypass gamma set if not standard type

If non-standard gamma type detected set identity matrix flag
so that we can bypass the gamma mode.

Signed-off-by: John Barberiz <jbarberi@amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dc_hw_types.h

@@ -436,6 +436,8 @@ struct dc_gamma {
 
 	/* private to DC core */
 	struct dc_context *ctx;
+
+	bool is_identity;
 };
 
 /* Used by both ipp amd opp functions*/

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

@@ -900,7 +900,9 @@ static bool dcn10_set_input_transfer_func(struct pipe_ctx *pipe_ctx,
 	if (plane_state->in_transfer_func)
 		tf = plane_state->in_transfer_func;
 
-	if (plane_state->gamma_correction && dce_use_lut(plane_state->format))
+	if (plane_state->gamma_correction->is_identity)
+		dpp_base->funcs->dpp_set_degamma(dpp_base, IPP_DEGAMMA_MODE_BYPASS);
+	else if (plane_state->gamma_correction && dce_use_lut(plane_state->format))
 		dpp_base->funcs->dpp_program_input_lut(dpp_base, plane_state->gamma_correction);
 
 	if (tf == NULL)