drm/amd/display: Only use ODM2:1 policy for high pixel rate displays

We only gain a benefit of using the ODM2:1 dynamic policy if it allow us
to decrease DISPCLK to use the VMIN freq.  If the display config can
already achieve VMIN DISPCLK freq without ODM2:1, don't apply the
policy.

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/dcn32/dcn32_resource.c

@@ -1872,6 +1872,7 @@ int dcn32_populate_dml_pipes_from_context(
 				context->stream_status[0].plane_count <= 1 &&
 				!dc_is_hdmi_signal(res_ctx->pipe_ctx[i].stream->signal) &&
 				is_h_timing_divisible_by_2(res_ctx->pipe_ctx[i].stream) &&
+				pipe->stream->timing.pix_clk_100hz * 100 > DCN3_2_VMIN_DISPCLK_HZ &&
 				dc->debug.enable_single_display_2to1_odm_policy) {
 			pipes[pipe_cnt].pipe.dest.odm_combine_policy = dm_odm_combine_policy_2to1;
 		}

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h

@@ -37,6 +37,7 @@
 #define DCN3_2_MBLK_WIDTH 128
 #define DCN3_2_MBLK_HEIGHT_4BPE 128
 #define DCN3_2_MBLK_HEIGHT_8BPE 64
+#define DCN3_2_VMIN_DISPCLK_HZ 717000000
 
 #define TO_DCN32_RES_POOL(pool)\
 	container_of(pool, struct dcn32_resource_pool, base)