Patch "drm/amd/display: Uninitialized variables causing 4k60 UCLK to stay at DPM1 and not DPM0" has been added to the 6.1-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

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

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amd-display-uninitialized-variables-causing-4k60.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 76cb7dc726e88b229d539ba1fafcd7edbe6a83df
Author: Samson Tam <samson.tam@xxxxxxx>
Date:   Mon Dec 5 11:08:40 2022 -0500

    drm/amd/display: Uninitialized variables causing 4k60 UCLK to stay at DPM1 and not DPM0
    
    [ Upstream commit f3c23bea598ab7e8e4b8c5ca66598921310f718e ]
    
    [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 <aurabindo.pillai@xxxxxxx>
    Signed-off-by: Samson Tam <samson.tam@xxxxxxx>
    Reviewed-by: Aric Cyr <aric.cyr@xxxxxxx>
    Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Cc: stable@xxxxxxxxxxxxxxx # 6.0.x, 6.1.x
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c b/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c
index 5af601cff1a0..b53feeaf5cf1 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c
+++ b/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;