sti_vtg_get_line_number
y = sti_vtg_get_line_number(*mode, 0);
y = sti_vtg_get_line_number(*mode, mode->vdisplay - 1);
y = sti_vtg_get_line_number(*mode, dst_y);
ydo = sti_vtg_get_line_number(*mode, dst_y);
yds = sti_vtg_get_line_number(*mode, dst_y + dst_h - 1);
ymin = sti_vtg_get_line_number(hdmi->mode, 0);
ymax = sti_vtg_get_line_number(hdmi->mode, hdmi->mode.vdisplay - 1);
ydo = sti_vtg_get_line_number(*mode, 0);
yds = sti_vtg_get_line_number(*mode, mode->vdisplay - 1);
ydo = sti_vtg_get_line_number(*mode, 0);
yds = sti_vtg_get_line_number(*mode, mode->vdisplay - 1);
ydo = sti_vtg_get_line_number(*mode, dst_y);
yds = sti_vtg_get_line_number(*mode, dst_y + dst_h - 1);
u32 ystart = sti_vtg_get_line_number(*mode, 0);
u32 ystop = sti_vtg_get_line_number(*mode, mode->vdisplay - 1);
u32 sti_vtg_get_line_number(struct drm_display_mode mode, int y);