drm/msm: dpu: Move pm_runtime_(get|put) from vblank_enable

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

Reviewed-by: Jeykumar Sankaran <jsanka@codeaurora.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 2846506..f359994 100644 (file)
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -784,8 +784,6 @@ 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;
@@ -808,8 +806,6 @@ static void _dpu_crtc_vblank_enable_no_lock(
 
                        dpu_encoder_register_vblank_callback(enc, NULL, NULL);
                }
-
-               pm_runtime_put_sync(dev->dev);
        }
 }
 
@@ -918,6 +914,8 @@ 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,
@@ -933,6 +931,8 @@ 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);