HSYNC_START
HSYNC_START(hsync_start - 1) | HSYNC_END(hsync_end - 1));
HSYNC_START(adjusted_mode->crtc_hsync_start - 1) |
HSYNC_START(656 - 1) | HSYNC_END(752 - 1));
(HSYNC_START & 0x07F8) >> 3);
(HSYNC_START & 0x0007) << 4 |