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_dcn5_calcs_dchub.c:82
dcn5_calculate_byte_per_pixel_and_block_sizes()
warn: duplicate check 'SourcePixelFormat == 17' (previous on line 77)
drivers/gpu/drm/amd/amdgpu/../display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn5_calcs_dchub.c
45 void dcn5_calculate_byte_per_pixel_and_block_sizes(
46 enum dml2_source_format_class SourcePixelFormat,
47 enum dml2_swizzle_mode SurfaceTiling,
48 unsigned int pitch_y,
49 unsigned int pitch_c,
50
51 // Output
52 unsigned int *BytePerPixelY,
53 unsigned int *BytePerPixelC,
54 double *BytePerPixelDETY,
55 double *BytePerPixelDETC,
56 unsigned int *BlockHeight256BytesY,
57 unsigned int *BlockHeight256BytesC,
58 unsigned int *BlockWidth256BytesY,
59 unsigned int *BlockWidth256BytesC,
60 unsigned int *MacroTileHeightY,
61 unsigned int *MacroTileHeightC,
62 unsigned int *MacroTileWidthY,
63 unsigned int *MacroTileWidthC,
64 bool *surf_linear128_l,
65 bool *surf_linear128_c)
66 {
67 *BytePerPixelDETY = 0;
68 *BytePerPixelDETC = 0;
69 *BytePerPixelY = 0;
70 *BytePerPixelC = 0;
71
72 if (SourcePixelFormat == dml2_444_64) {
73 *BytePerPixelDETY = 8;
74 *BytePerPixelDETC = 0;
75 *BytePerPixelY = 8;
76 *BytePerPixelC = 0;
77 } else if (SourcePixelFormat == dml2_444_32 || SourcePixelFormat
== dml2_rgbe || SourcePixelFormat == dml2_422_packed_10 || SourcePixelFormat ==
dml2_422_packed_12) {
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
78 *BytePerPixelDETY = 4;
79 *BytePerPixelDETC = 0;
80 *BytePerPixelY = 4;
81 *BytePerPixelC = 0;
--> 82 } else if (SourcePixelFormat == dml2_422_packed_10) {
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dead code.
83 *BytePerPixelDETY = (double)(8.0 / 3);
84 *BytePerPixelDETC = 0;
85 *BytePerPixelY = 4;
86 *BytePerPixelC = 0;
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regards,
dan carpenter
