tree: git://people.freedesktop.org/~agd5f/linux.git drm-next-4.18-wip head: 5d404d3139a4624892a12683240abfae931ee849 commit: 2852a36199784540a872f42fa6dc7d8d51eee0d8 [43/120] drm/amd/display: Add vline IRQ programming for DCN

smatch warnings: drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_optc.c:127 get_start_vline() warn: unsigned 'vertical_line_start' is never less than zero.

vim +/vertical_line_start +127 drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_optc.c

95 96 static uint32_t get_start_vline(struct timing_generator *optc, const struct dc_crtc_timing *dc_crtc_timing) 97 { 98 struct dc_crtc_timing patched_crtc_timing; 99 uint32_t vesa_sync_start; 100 uint32_t asic_blank_end; 101 uint32_t interlace_factor; 102 uint32_t vertical_line_start; 103 104 patched_crtc_timing = *dc_crtc_timing; 105 optc1_apply_front_porch_workaround(optc, &patched_crtc_timing); 106 107 vesa_sync_start = patched_crtc_timing.h_addressable + 108 patched_crtc_timing.h_border_right + 109 patched_crtc_timing.h_front_porch; 110 111 asic_blank_end = patched_crtc_timing.h_total - 112 vesa_sync_start - 113 patched_crtc_timing.h_border_left; 114 115 interlace_factor = patched_crtc_timing.flags.INTERLACE ? 2 : 1; 116 117 vesa_sync_start = patched_crtc_timing.v_addressable + 118 patched_crtc_timing.v_border_bottom + 119 patched_crtc_timing.v_front_porch; 120 121 asic_blank_end = (patched_crtc_timing.v_total - 122 vesa_sync_start - 123 patched_crtc_timing.v_border_top) 124 * interlace_factor; 125 126 vertical_line_start = asic_blank_end - optc->dlg_otg_param.vstartup_start + 1;

127 if (vertical_line_start < 0) {

128 ASSERT(0); 129 vertical_line_start = 0; 130 } 131 132 return vertical_line_start; 133 } 134

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