drm/i915: Keep vblank interrupts enabled while enabling/disabling planes

Because of the upcoming vblank interrupt driven watermark update
mechanism we will have use for vblank interrupts during plane
enabling/disabling. So don't call drm_vblank_off() until planes
are off, and call drm_vblank_on() just before we start to enable
the planes.

v2: Pimp commit message (Paulo)

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 90f4f05c3000c26be070e65f017def4c359e0cc5..18da083717b9f1439eaf04c7e96c40dee6114ebd 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3885,6 +3885,8 @@ static void intel_crtc_enable_planes(struct drm_crtc *crtc)
        int pipe = intel_crtc->pipe;
        int plane = intel_crtc->plane;
 
+       drm_vblank_on(dev, pipe);
+
        intel_enable_primary_hw_plane(dev_priv, plane, pipe);
        intel_enable_planes(crtc);
        /* The fixup needs to happen before cursor is enabled */
@@ -3910,7 +3912,6 @@ static void intel_crtc_disable_planes(struct drm_crtc *crtc)
        int plane = intel_crtc->plane;
 
        intel_crtc_wait_for_pending_flips(crtc);
-       drm_crtc_vblank_off(crtc);
 
        if (dev_priv->fbc.plane == plane)
                intel_disable_fbc(dev);
@@ -3921,6 +3922,8 @@ static void intel_crtc_disable_planes(struct drm_crtc *crtc)
        intel_crtc_update_cursor(crtc, false);
        intel_disable_planes(crtc);
        intel_disable_primary_hw_plane(dev_priv, plane, pipe);
+
+       drm_vblank_off(dev, pipe);
 }
 
 static void ironlake_crtc_enable(struct drm_crtc *crtc)
@@ -3999,8 +4002,6 @@ static void ironlake_crtc_enable(struct drm_crtc *crtc)
                cpt_verify_modeset(dev, intel_crtc->pipe);
 
        intel_crtc_enable_planes(crtc);
-
-       drm_crtc_vblank_on(crtc);
 }
 
 /* IPS only exists on ULT machines and is tied to pipe A. */
@@ -4114,8 +4115,6 @@ static void haswell_crtc_enable(struct drm_crtc *crtc)
         * to change the workaround. */
        haswell_mode_set_planes_workaround(intel_crtc);
        intel_crtc_enable_planes(crtc);
-
-       drm_crtc_vblank_on(crtc);
 }
 
 static void ironlake_pfit_disable(struct intel_crtc *crtc)
@@ -4625,8 +4624,6 @@ static void valleyview_crtc_enable(struct drm_crtc *crtc)
 
        intel_crtc_enable_planes(crtc);
 
-       drm_crtc_vblank_on(crtc);
-
        /* Underruns don't raise interrupts, so check manually. */
        i9xx_check_fifo_underruns(dev);
 }
@@ -4719,8 +4716,6 @@ static void i9xx_crtc_enable(struct drm_crtc *crtc)
        if (IS_GEN2(dev))
                intel_set_cpu_fifo_underrun_reporting(dev, pipe, true);
 
-       drm_crtc_vblank_on(crtc);
-
        /* Underruns don't raise interrupts, so check manually. */
        i9xx_check_fifo_underruns(dev);
 }