PV_CONTROL
CRTC_WRITE(PV_CONTROL, CRTC_READ(PV_CONTROL) & ~PV_CONTROL_EN);
CRTC_WRITE(PV_CONTROL, CRTC_READ(PV_CONTROL) | PV_CONTROL_FIFO_CLR);
CRTC_WRITE(PV_CONTROL, PV_CONTROL_FIFO_CLR |
if (!(CRTC_READ(PV_CONTROL) & PV_CONTROL_EN))
encoder_sel = VC4_GET_FIELD(CRTC_READ(PV_CONTROL), PV_CONTROL_CLK_SELECT);
VC4_REG32(PV_CONTROL),
CRTC_WRITE(PV_CONTROL, CRTC_READ(PV_CONTROL) | PV_CONTROL_EN);