drm/i915: Disable/enable planes as the first/last thing during modeset on HSW

Refactor the plane enabling/disabling into helper functions and move
the calls to happen as the first thing during .crtc_disable, and the
last thing during .crtc_enable.

Those are the two clear points where we are sure that the pipe is
actually running regardless of the encoder type or hardware
generation.

v2: Made by Paulo:
  Remove the code touching everything but the Haswell functions. We
  need this change on Haswell right now since it fixes a FIFO underrun
  that we get on pipe A while we enable pipe B (see the workaround
  notes on the Haswell mode set sequence documentation). We can bring
  back the code to gens 2-7 later, once they're tested.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@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 99efbe51d7ce4d8ddd83b5be19eea01cfbe7e525..521df12da86f6ca16e1eff030b9d223380dddd60 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3453,6 +3453,47 @@ static bool hsw_crtc_supports_ips(struct intel_crtc *crtc)
        return HAS_IPS(crtc->base.dev) && crtc->pipe == PIPE_A;
 }
 
+static void haswell_crtc_enable_planes(struct drm_crtc *crtc)
+{
+       struct drm_device *dev = crtc->dev;
+       struct drm_i915_private *dev_priv = dev->dev_private;
+       struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+       int pipe = intel_crtc->pipe;
+       int plane = intel_crtc->plane;
+
+       intel_enable_plane(dev_priv, plane, pipe);
+       intel_enable_planes(crtc);
+       intel_crtc_update_cursor(crtc, true);
+
+       hsw_enable_ips(intel_crtc);
+
+       mutex_lock(&dev->struct_mutex);
+       intel_update_fbc(dev);
+       mutex_unlock(&dev->struct_mutex);
+}
+
+static void haswell_crtc_disable_planes(struct drm_crtc *crtc)
+{
+       struct drm_device *dev = crtc->dev;
+       struct drm_i915_private *dev_priv = dev->dev_private;
+       struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+       int pipe = intel_crtc->pipe;
+       int plane = intel_crtc->plane;
+
+       intel_crtc_wait_for_pending_flips(crtc);
+       drm_vblank_off(dev, pipe);
+
+       /* FBC must be disabled before disabling the plane on HSW. */
+       if (dev_priv->fbc.plane == plane)
+               intel_disable_fbc(dev);
+
+       hsw_disable_ips(intel_crtc);
+
+       intel_crtc_update_cursor(crtc, false);
+       intel_disable_planes(crtc);
+       intel_disable_plane(dev_priv, plane, pipe);
+}
+
 static void haswell_crtc_enable(struct drm_crtc *crtc)
 {
        struct drm_device *dev = crtc->dev;
@@ -3460,7 +3501,6 @@ static void haswell_crtc_enable(struct drm_crtc *crtc)
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_encoder *encoder;
        int pipe = intel_crtc->pipe;
-       int plane = intel_crtc->plane;
 
        WARN_ON(!crtc->enabled);
 
@@ -3496,24 +3536,17 @@ static void haswell_crtc_enable(struct drm_crtc *crtc)
        intel_update_watermarks(crtc);
        intel_enable_pipe(dev_priv, pipe,
                          intel_crtc->config.has_pch_encoder, false);
-       intel_enable_plane(dev_priv, plane, pipe);
-       intel_enable_planes(crtc);
-       intel_crtc_update_cursor(crtc, true);
-
-       hsw_enable_ips(intel_crtc);
 
        if (intel_crtc->config.has_pch_encoder)
                lpt_pch_enable(crtc);
 
-       mutex_lock(&dev->struct_mutex);
-       intel_update_fbc(dev);
-       mutex_unlock(&dev->struct_mutex);
-
        for_each_encoder_on_crtc(dev, crtc, encoder) {
                encoder->enable(encoder);
                intel_opregion_notify_encoder(encoder, true);
        }
 
+       haswell_crtc_enable_planes(crtc);
+
        /*
         * There seems to be a race in PCH platform hw (at least on some
         * outputs) where an enabled pipe still completes any pageflip right
@@ -3620,30 +3653,18 @@ static void haswell_crtc_disable(struct drm_crtc *crtc)
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_encoder *encoder;
        int pipe = intel_crtc->pipe;
-       int plane = intel_crtc->plane;
        enum transcoder cpu_transcoder = intel_crtc->config.cpu_transcoder;
 
        if (!intel_crtc->active)
                return;
 
+       haswell_crtc_disable_planes(crtc);
+
        for_each_encoder_on_crtc(dev, crtc, encoder) {
                intel_opregion_notify_encoder(encoder, false);
                encoder->disable(encoder);
        }
 
-       intel_crtc_wait_for_pending_flips(crtc);
-       drm_vblank_off(dev, pipe);
-
-       /* FBC must be disabled before disabling the plane on HSW. */
-       if (dev_priv->fbc.plane == plane)
-               intel_disable_fbc(dev);
-
-       hsw_disable_ips(intel_crtc);
-
-       intel_crtc_update_cursor(crtc, false);
-       intel_disable_planes(crtc);
-       intel_disable_plane(dev_priv, plane, pipe);
-
        if (intel_crtc->config.has_pch_encoder)
                intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_A, false);
        intel_disable_pipe(dev_priv, pipe);