Variable TPreMargin is not effectively used in the function, so delete it.

drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn32/display_mode_vba_util_32.c:3478:10:
 warning: variable ‘TPreMargin’ set but not used.

Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=3144
Reported-by: Abaci Robot <ab...@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.ch...@linux.alibaba.com>
---
 .../gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.c | 2 --
 1 file changed, 2 deletions(-)

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 d967264e25cf..7f840c20d213 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
@@ -3475,7 +3475,6 @@ bool dml32_CalculatePrefetchSchedule(
        double  min_Lsw;
        double  Tsw_est1 = 0;
        double  Tsw_est3 = 0;
-       double  TPreMargin = 0;
 
        if (v->GPUVMEnable == true && v->HostVMEnable == true)
                HostVMDynamicLevelsTrips = v->HostVMMaxNonCachedPageTableLevels;
@@ -3703,7 +3702,6 @@ bool dml32_CalculatePrefetchSchedule(
        dst_y_prefetch_equ = dml_floor(4.0 * (dst_y_prefetch_equ + 0.125), 1) / 
4.0;
        Tpre_rounded = dst_y_prefetch_equ * LineTime;
 
-       TPreMargin = Tpre_rounded - TPreReq;
 #ifdef __DML_VBA_DEBUG__
        dml_print("DML::%s: dst_y_prefetch_equ: %f (after round)\n", __func__, 
dst_y_prefetch_equ);
        dml_print("DML::%s: LineTime: %f\n", __func__, LineTime);
-- 
2.20.1.7.g153144c

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