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[Why] The minimum value of the dst_y_prefetch_equ was not correct in prefetch calculation whice causes OPTC underflow. [How] Add the min operation of dst_y_prefetch_equ in prefetch calculation for legacy DML. Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> Signed-off-by: TungYu Lu <tungyu.lu@amd.com> Signed-off-by: Zaeem Mohamed <zaeem.mohamed@amd.com> Tested-by: Mark Broadworth <mark.broadworth@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>