[bug report] drm/amd/display: Add new sources for DCN6

[Dan Carpenter <error27@gmail.com>]

Hello Aurabindo Pillai,

Commit 7f7d7ea1fa51 ("drm/amd/display: Add new sources for DCN6")
from Jul 22, 2026 (linux-next), leads to the following Smatch static
checker warning:

	drivers/gpu/drm/amd/amdgpu/../display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn6_calcs_dchub.c:572 dcn6_calculate_flip_schedule()
	warn: duplicate check 'GPUVMEnable' (previous on line 570)

drivers/gpu/drm/amd/amdgpu/../display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn6_calcs_dchub.c
    566         DML_LOG_VERBOSE("DML::%s: VRatio = %f\n", __func__, VRatio);
    567 
    568         bool flip_enable = iflip_enable || (GPUVMEnable && (ihostvm_enable || iffbmm_enable));
    569 
    570         if (GPUVMEnable) {
                    ^^^^^^^^^^^

    571                 if (l->dual_plane) {
--> 572                         if (GPUVMEnable) {
                                    ^^^^^^^^^^^

    573                                 l->min_row_height = dpte_row_height;
    574                                 l->min_row_height_chroma = dpte_row_height_chroma;
    575                         } else {
    576                                 l->min_row_height = meta_row_height;
    577                                 l->min_row_height_chroma = meta_row_height_chroma;

Dead code.

    578                         }
    579                         l->min_row_time = math_min2(l->min_row_height * LineTime / VRatio, l->min_row_height_chroma * LineTime / VRatioChroma);
    580                 } else {
    581                         if (GPUVMEnable)
                                    ^^^^^^^^^^^

    582                                 l->min_row_height = dpte_row_height;
    583                         else
    584                                 l->min_row_height = meta_row_height;

More dead code.

    585 
    586                         l->min_row_time = l->min_row_height * LineTime / VRatio;
    587                 }
    588                 DML_LOG_VERBOSE("DML::%s: min_row_time = %f\n", __func__, l->min_row_time);
    589                 DML_ASSERT(l->min_row_time > 0);

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regards,
dan carpenter