drm/amd/display: Uninitialized variables causing 4k60 UCLK to stay at DPM1 and not DPM0

[ Upstream commit f3c23be ]

[Why]
SwathSizePerSurfaceY[] and SwathSizePerSurfaceC[] values are uninitialized
 because we are using += instead of = operator.

[How]
Assign values in loop with = operator.

Acked-by: Aurabindo Pillai <[email protected]>
Signed-off-by: Samson Tam <[email protected]>
Reviewed-by: Aric Cyr <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Cc: [email protected] # 6.0.x, 6.1.x
Signed-off-by: Sasha Levin <[email protected]>

Author: Samson Tam

drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c

@@ -6257,12 +6257,12 @@ bool dml32_CalculateDETSwathFillLatencyHiding(unsigned int NumberOfActiveSurface
 	double SwathSizePerSurfaceC[DC__NUM_DPP__MAX];
 	bool NotEnoughDETSwathFillLatencyHiding = false;
 
-	/* calculate sum of single swath size for all pipes in bytes*/
+	/* calculate sum of single swath size for all pipes in bytes */
 	for (k = 0; k < NumberOfActiveSurfaces; k++) {
-		SwathSizePerSurfaceY[k] += SwathHeightY[k] * SwathWidthY[k] * BytePerPixelInDETY[k] * NumOfDPP[k];
+		SwathSizePerSurfaceY[k] = SwathHeightY[k] * SwathWidthY[k] * BytePerPixelInDETY[k] * NumOfDPP[k];
 
 		if (SwathHeightC[k] != 0)
-			SwathSizePerSurfaceC[k] += SwathHeightC[k] * SwathWidthC[k] * BytePerPixelInDETC[k] * NumOfDPP[k];
+			SwathSizePerSurfaceC[k] = SwathHeightC[k] * SwathWidthC[k] * BytePerPixelInDETC[k] * NumOfDPP[k];
 		else
 			SwathSizePerSurfaceC[k] = 0;