[PATCH v2 17/24] drm/msm: dpu: Move pm_runtime_(get|put) from vblank_enable

Sean Paul
2018-11-16T18:42:27Z

There are 4 times that _dpu_crtc_vblank_enable_no_lock() is called:

1- crtc enable
2- crtc disable
3- crtc vblank enable
4- crtc vblank disable

When we enable or disable the crtc, we call drm_crtc_vblank_on and
drm_crtc_vblank_off respectively. That will gate vblank enables and
disables to only being called when the crtc is active. That means that
we can just enable/disable pm runtime in crtc enable/disable. This will
be beneficial in trying to eliminate blocking calls from the vblank call
chain.

Changes in v2:
- None

Signed-off-by: Sean Paul <seanpaul@chromium.org>
---
drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index cd0a0bea4335..c49aaf412b6e 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -769,8 +769,6 @@ static void _dpu_crtc_vblank_enable_no_lock(
struct drm_encoder *enc;

if (enable) {
- pm_runtime_get_sync(dev->dev);
-
list_for_each_entry(enc, &dev->mode_config.encoder_list, head) {
if (enc->crtc != crtc)
continue;
@@ -793,8 +791,6 @@ static void _dpu_crtc_vblank_enable_no_lock(

dpu_encoder_register_vblank_callback(enc, NULL, NULL);
}
-
- pm_runtime_put_sync(dev->dev);
}
}

@@ -891,6 +887,8 @@ static void dpu_crtc_disable(struct drm_crtc *crtc)
crtc->state->event = NULL;
spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
}
+
+ pm_runtime_put_sync(crtc->dev->dev);
}

static void dpu_crtc_enable(struct drm_crtc *crtc,
@@ -906,6 +904,8 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
}
priv = crtc->dev->dev_private;

+ pm_runtime_get_sync(crtc->dev->dev);
+
DRM_DEBUG_KMS("crtc%d\n", crtc->base.id);
dpu_crtc = to_dpu_crtc(crtc);