drm/i915: Move vblank evasion to commit (v4)

Move the vblank evasion up from the low-level, hw-specific
update_plane() handlers to the general plane commit operation.
Everything inside commit should now be non-sleeping, so this brings us
closer to how vblank evasion will behave once we move over to atomic.

v2:
 - Restore lost intel_crtc->active check on vblank evasion

v3:
 - Replace assert_pipe_enabled() in intel_disable_primary_hw_plane()
   with an intel_crtc->active test; it turns out assert_pipe_enabled()
   grabs some mutexes and can sleep, which we can't do with interrupts
   disabled.

v4:
 - Equivalent to v2; v3 change is now squashed into an earlier patch
   of the series.  (Ander).

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 260b91c4cbbf..b7c59d56c3a6 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11864,6 +11864,12 @@ static void intel_begin_crtc_commit(struct drm_crtc *crtc)
                 intel_update_watermarks(crtc);
 
         intel_runtime_pm_get(dev_priv);
+
+        /* Perform vblank evasion around commit operation */
+        if (intel_crtc->active)
+                intel_crtc->atomic.evade =
+                        intel_pipe_update_start(intel_crtc,
+                                                &intel_crtc->atomic.start_vbl_count);
 }
 
 static void intel_finish_crtc_commit(struct drm_crtc *crtc)
@@ -11873,6 +11879,10 @@ static void intel_finish_crtc_commit(struct drm_crtc *crtc)
         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
         struct drm_plane *p;
 
+        if (intel_crtc->atomic.evade)
+                intel_pipe_update_end(intel_crtc,
+                                      intel_crtc->atomic.start_vbl_count);
+
         intel_runtime_pm_put(dev_priv);
 
         if (intel_crtc->atomic.wait_vblank)