VIDEO_VBLK_LINES
dsi_reg_wr(ctx, VIDEO_VBLK_LINES, VFP_LINES, 0, vm->vfront_porch);
dsi_reg_wr(ctx, VIDEO_VBLK_LINES, VBP_LINES, 10, vm->vback_porch);
dsi_reg_wr(ctx, VIDEO_VBLK_LINES, VSA_LINES, 20, vm->vsync_len);