drm/amd/display: Update DML formula

[why]
This is to update SW DML implementation.
Reviewed-by: NDmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Reviewed-by: NAriel Bernstein <Eric.Bernstein@amd.com>
Acked-by: NAlex Hung <alex.hung@amd.com>
Signed-off-by: NCharlene Liu <Charlene.Liu@amd.com>
Tested-by: NMark Broadworth <mark.broadworth@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dml/dcn31/display_mode_vba_31.c

@@ -1052,7 +1052,8 @@ static bool CalculatePrefetchSchedule(
 	else
 		bytes_pp = myPipe->BytePerPixelY + myPipe->BytePerPixelC;
 	/*rev 99*/
-	prefetch_bw_pr = dml_min(1, bytes_pp * myPipe->PixelClock / (double) myPipe->DPPPerPlane);
+	prefetch_bw_pr = bytes_pp * myPipe->PixelClock / (double) myPipe->DPPPerPlane;
+	prefetch_bw_pr = dml_min(1, myPipe->VRatio) * prefetch_bw_pr;
 	max_Tsw = dml_max(PrefetchSourceLinesY, PrefetchSourceLinesC) * LineTime;
 	prefetch_sw_bytes = PrefetchSourceLinesY * swath_width_luma_ub * myPipe->BytePerPixelY + PrefetchSourceLinesC * swath_width_chroma_ub * myPipe->BytePerPixelC;
 	prefetch_bw_oto = dml_max(bytes_pp * myPipe->PixelClock / myPipe->DPPPerPlane, prefetch_sw_bytes / (dml_max(PrefetchSourceLinesY, PrefetchSourceLinesC) * LineTime));

drivers/gpu/drm/amd/display/dc/dml/dcn314/display_mode_vba_314.c

@@ -1074,7 +1074,8 @@ static bool CalculatePrefetchSchedule(
 	else
 		bytes_pp = myPipe->BytePerPixelY + myPipe->BytePerPixelC;
 	/*rev 99*/
-	prefetch_bw_pr = dml_min(1, bytes_pp * myPipe->PixelClock / (double) myPipe->DPPPerPlane);
+	prefetch_bw_pr = bytes_pp * myPipe->PixelClock / (double) myPipe->DPPPerPlane;
+	prefetch_bw_pr = dml_min(1, myPipe->VRatio) * prefetch_bw_pr;
 	max_Tsw = dml_max(PrefetchSourceLinesY, PrefetchSourceLinesC) * LineTime;
 	prefetch_sw_bytes = PrefetchSourceLinesY * swath_width_luma_ub * myPipe->BytePerPixelY + PrefetchSourceLinesC * swath_width_chroma_ub * myPipe->BytePerPixelC;
 	prefetch_bw_oto = dml_max(bytes_pp * myPipe->PixelClock / myPipe->DPPPerPlane, prefetch_sw_bytes / (dml_max(PrefetchSourceLinesY, PrefetchSourceLinesC) * LineTime));