drm/amd/display: Only consider pixle rate div policy for DCN32+

[Why and How]
- Only consider pixel rate div policy for DCN32+
Reviewed-by: Martin Leung <Martin.Leung@amd.com>
Acked-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Alvin Lee <Alvin.Lee2@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn314/dcn314_hwseq.c

@@ -343,7 +343,6 @@ unsigned int dcn314_calculate_dccg_k1_k2_values(struct pipe_ctx *pipe_ctx, unsig
 {
 	struct dc_stream_state *stream = pipe_ctx->stream;
 	unsigned int odm_combine_factor = 0;
-	struct dc *dc = pipe_ctx->stream->ctx->dc;
 	bool two_pix_per_container = false;
 
 	two_pix_per_container = optc2_is_two_pixels_per_containter(&stream->timing);
@@ -364,7 +363,7 @@ unsigned int dcn314_calculate_dccg_k1_k2_values(struct pipe_ctx *pipe_ctx, unsig
 		} else {
 			*k1_div = PIXEL_RATE_DIV_BY_1;
 			*k2_div = PIXEL_RATE_DIV_BY_4;
-			if ((odm_combine_factor == 2) || dc->debug.enable_dp_dig_pixel_rate_div_policy)
+			if (odm_combine_factor == 2)
 				*k2_div = PIXEL_RATE_DIV_BY_2;
 		}
 	}
@@ -384,21 +383,10 @@ void dcn314_set_pixels_per_cycle(struct pipe_ctx *pipe_ctx)
 		return;
 
 	odm_combine_factor = get_odm_config(pipe_ctx, NULL);
-	if (optc2_is_two_pixels_per_containter(&pipe_ctx->stream->timing) || odm_combine_factor > 1
-		|| dcn314_is_dp_dig_pixel_rate_div_policy(pipe_ctx))
+	if (optc2_is_two_pixels_per_containter(&pipe_ctx->stream->timing) || odm_combine_factor > 1)
 		pix_per_cycle = 2;
 
 	if (pipe_ctx->stream_res.stream_enc->funcs->set_input_mode)
 		pipe_ctx->stream_res.stream_enc->funcs->set_input_mode(pipe_ctx->stream_res.stream_enc,
 				pix_per_cycle);
 }
-
-bool dcn314_is_dp_dig_pixel_rate_div_policy(struct pipe_ctx *pipe_ctx)
-{
-	struct dc *dc = pipe_ctx->stream->ctx->dc;
-
-	if (dc_is_dp_signal(pipe_ctx->stream->signal) && !is_dp_128b_132b_signal(pipe_ctx) &&
-		dc->debug.enable_dp_dig_pixel_rate_div_policy)
-		return true;
-	return false;
-}

drivers/gpu/drm/amd/display/dc/dcn314/dcn314_hwseq.h

@@ -41,6 +41,4 @@ unsigned int dcn314_calculate_dccg_k1_k2_values(struct pipe_ctx *pipe_ctx, unsig
 
 void dcn314_set_pixels_per_cycle(struct pipe_ctx *pipe_ctx);
 
-bool dcn314_is_dp_dig_pixel_rate_div_policy(struct pipe_ctx *pipe_ctx);
-
 #endif /* __DC_HWSS_DCN314_H__ */

drivers/gpu/drm/amd/display/dc/dcn314/dcn314_init.c

@@ -146,7 +146,6 @@ static const struct hwseq_private_funcs dcn314_private_funcs = {
 	.setup_hpo_hw_control = dcn31_setup_hpo_hw_control,
 	.calculate_dccg_k1_k2_values = dcn314_calculate_dccg_k1_k2_values,
 	.set_pixels_per_cycle = dcn314_set_pixels_per_cycle,
-	.is_dp_dig_pixel_rate_div_policy = dcn314_is_dp_dig_pixel_rate_div_policy,
 };
 
 void dcn314_hw_sequencer_construct(struct dc *dc)