/* change the clock source source = INTERNAL_QUARTZ or UER_SYNC  */
static void vxp_set_clock_source(struct vx_core *_chip, int source)
/* change the clock source source = INTERNAL_QUARTZ or UER_SYNC  */
static void vxp_set_clock_source(struct vx_core *_chip, int source)
{
	struct snd_vxpocket *chip = (struct snd_vxpocket *)_chip;
	if (source == INTERNAL_QUARTZ)
		chip->regCDSP &= ~VXP_CDSP_CLOCKIN_SEL_MASK;
	else
		chip->regCDSP |= VXP_CDSP_CLOCKIN_SEL_MASK;
	vx_outb(chip, CDSP, chip->regCDSP);
}