Add missing drm_crtc_vblank_on/off() calls so vblank irq handling/updating/timestamping never runs with a crtc shut down or during its shutdown/startup, as that causes large jumps in vblank count and trouble for compositors.
Signed-off-by: Mario Kleiner mario.kleiner.de@gmail.com Cc: Eric Anholt eric@anholt.net --- drivers/gpu/drm/vc4/vc4_crtc.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c index 7ffdad5..2682f07 100644 --- a/drivers/gpu/drm/vc4/vc4_crtc.c +++ b/drivers/gpu/drm/vc4/vc4_crtc.c @@ -475,6 +475,9 @@ static void vc4_crtc_disable(struct drm_crtc *crtc) int ret; require_hvs_enabled(dev);
+ /* Disable vblank irq handling before crtc is disabled. */ + drm_crtc_vblank_off(crtc); + CRTC_WRITE(PV_V_CONTROL, CRTC_READ(PV_V_CONTROL) & ~PV_VCONTROL_VIDEN); ret = wait_for(!(CRTC_READ(PV_V_CONTROL) & PV_VCONTROL_VIDEN), 1); @@ -525,6 +528,9 @@ static void vc4_crtc_enable(struct drm_crtc *crtc) /* Turn on the pixel valve, which will emit the vstart signal. */ CRTC_WRITE(PV_V_CONTROL, CRTC_READ(PV_V_CONTROL) | PV_VCONTROL_VIDEN); + + /* Enable vblank irq handling after crtc is started. */ + drm_crtc_vblank_on(crtc); }
static bool vc4_crtc_mode_fixup(struct drm_crtc *crtc,