drm/i915: Reduce the time we hold struct mutex in intel_pipe_set_base()

We don't need to hold struct_mutex all through intel_pipe_set_base(),
just need to hold it while pinning/unpinning the buffers.

So reduce the struct_mutext usage in intel_pipe_set_base() just like we
did for the sprite code in:
 commit 82284b6becdbef6d8cd3fb43e8698510833a5129
 Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
 Date:   Tue Oct 1 18:02:12 2013 +0300

    drm/i915: Reduce the time we hold struct mutex in sprite update_plane code

The FBC and PSR locking is still entirely fubar. That stuff was
previouly done while holding struct_mutex, so leave it there for now.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index e71dda5feab2..8c3746f7b523 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2477,8 +2477,8 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
         ret = intel_pin_and_fence_fb_obj(dev,
                                          to_intel_framebuffer(fb)->obj,
                                          NULL);
+        mutex_unlock(&dev->struct_mutex);
         if (ret != 0) {
-                mutex_unlock(&dev->struct_mutex);
                 DRM_ERROR("pin & fence failed\n");
                 return ret;
         }
@@ -2516,6 +2516,7 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
 
         ret = dev_priv->display.update_plane(crtc, fb, x, y);
         if (ret) {
+                mutex_lock(&dev->struct_mutex);
                 intel_unpin_fb_obj(to_intel_framebuffer(fb)->obj);
                 mutex_unlock(&dev->struct_mutex);
                 DRM_ERROR("failed to update base address\n");
@@ -2530,9 +2531,12 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
         if (old_fb) {
                 if (intel_crtc->active && old_fb != fb)
                         intel_wait_for_vblank(dev, intel_crtc->pipe);
+                mutex_lock(&dev->struct_mutex);
                 intel_unpin_fb_obj(to_intel_framebuffer(old_fb)->obj);
+                mutex_unlock(&dev->struct_mutex);
         }
 
+        mutex_lock(&dev->struct_mutex);
         intel_update_fbc(dev);
         intel_edp_psr_update(dev);
         mutex_unlock(&dev->struct_mutex);