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drm/vc4: Enable/Disable vblanks properly in crtc en/disable. 

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>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Mario Kleiner 2016-07-19 20:59:01 +02:00 committed by Eric Anholt
parent e538092cb1
commit e941f05d3c
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/vc4/vc4_crtc.c
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@ -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,