2014-08-14 12:06 GMT-03:00 Paulo Zanoni <przan...@gmail.com>: > From: Paulo Zanoni <paulo.r.zan...@intel.com> > > If we're runtime suspended and try to use the plane interfaces, we > will get a lot of WARNs saying we did the wrong thing. > > We need to get runtime PM references to pin the objects, and to > change the fences. The pin functions are the ideal places for > this, but intel_crtc_cursor_set_obj() doesn't call them, so we also > have to add get/put calls inside it. There is no problem if we runtime > suspend right after these functions are finished, because the > registers written are forwarded to system memory. > > Note: for a complete fix of the cursor-dpms test case, we also need > the patch named "drm/i915: Don't try to enable cursor from setplane > when crtc is disabled". > > v2: - Narrow the put/get calls on intel_crtc_cursor_set_obj() (Daniel) > v3: - Make get/put also surround the fence and unpin calls (Daniel and > Ville). > - Merge all the plane changes into a single patch since they're > the same fix. > - Add the comment requested by Daniel. > v4: - Remove spurious whitespace (Ville). > v5: - Remove intel_crtc_update_cursor() chunk since Ville did an > equivalent fix in another patch (Ville). > v6: - Remove unpin chunk: it will be on a separate patch (Ville, > Chris, Daniel). > > Testcase: igt/pm_rpm/cursor > Testcase: igt/pm_rpm/cursor-dpms > Testcase: igt/pm_rpm/legacy-planes > Testcase: igt/pm_rpm/legacy-planes-dpms > Testcase: igt/pm_rpm/universal-planes > Testcase: igt/pm_rpm/universal-planes-dpms > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=81645
And now we also have a report from QA: Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=82603 > Cc: sta...@vger.kernel.org > Signed-off-by: Paulo Zanoni <paulo.r.zan...@intel.com> > --- > drivers/gpu/drm/i915/intel_display.c | 27 +++++++++++++++++++++++++++ > 1 file changed, 27 insertions(+) > > > I talked with Daniel and we agreed to leave any possible fixes related with > the > "unpin" functions to separate patches, possibly requiring separate IGT test > cases. > > diff --git a/drivers/gpu/drm/i915/intel_display.c > b/drivers/gpu/drm/i915/intel_display.c > index 3813526..17bc661 100644 > --- a/drivers/gpu/drm/i915/intel_display.c > +++ b/drivers/gpu/drm/i915/intel_display.c > @@ -2149,6 +2149,15 @@ intel_pin_and_fence_fb_obj(struct drm_device *dev, > if (need_vtd_wa(dev) && alignment < 256 * 1024) > alignment = 256 * 1024; > > + /* > + * Global gtt pte registers are special registers which actually > forward > + * writes to a chunk of system memory. Which means that there is no > risk > + * that the register values disappear as soon as we call > + * intel_runtime_pm_put(), so it is correct to wrap only the > + * pin/unpin/fence and not more. > + */ > + intel_runtime_pm_get(dev_priv); > + > dev_priv->mm.interruptible = false; > ret = i915_gem_object_pin_to_display_plane(obj, alignment, pipelined); > if (ret) > @@ -2166,12 +2175,14 @@ intel_pin_and_fence_fb_obj(struct drm_device *dev, > i915_gem_object_pin_fence(obj); > > dev_priv->mm.interruptible = true; > + intel_runtime_pm_put(dev_priv); > return 0; > > err_unpin: > i915_gem_object_unpin_from_display_plane(obj); > err_interruptible: > dev_priv->mm.interruptible = true; > + intel_runtime_pm_put(dev_priv); > return ret; > } > > @@ -8201,6 +8212,7 @@ static int intel_crtc_cursor_set_obj(struct drm_crtc > *crtc, > uint32_t width, uint32_t height) > { > struct drm_device *dev = crtc->dev; > + struct drm_i915_private *dev_priv = dev->dev_private; > struct intel_crtc *intel_crtc = to_intel_crtc(crtc); > enum pipe pipe = intel_crtc->pipe; > unsigned old_width, stride; > @@ -8231,6 +8243,16 @@ static int intel_crtc_cursor_set_obj(struct drm_crtc > *crtc, > > /* we only need to pin inside GTT if cursor is non-phy */ > mutex_lock(&dev->struct_mutex); > + > + /* > + * Global gtt pte registers are special registers which actually > forward > + * writes to a chunk of system memory. Which means that there is no > risk > + * that the register values disappear as soon as we call > + * intel_runtime_pm_put(), so it is correct to wrap only the > + * pin/unpin/fence and not more. > + */ > + intel_runtime_pm_get(dev_priv); > + > if (!INTEL_INFO(dev)->cursor_needs_physical) { > unsigned alignment; > > @@ -8280,6 +8302,10 @@ static int intel_crtc_cursor_set_obj(struct drm_crtc > *crtc, > > i915_gem_track_fb(intel_crtc->cursor_bo, obj, > INTEL_FRONTBUFFER_CURSOR(pipe)); > + > + if (obj) > + intel_runtime_pm_put(dev_priv); > + > mutex_unlock(&dev->struct_mutex); > > old_width = intel_crtc->cursor_width; > @@ -8301,6 +8327,7 @@ static int intel_crtc_cursor_set_obj(struct drm_crtc > *crtc, > fail_unpin: > i915_gem_object_unpin_from_display_plane(obj); > fail_locked: > + intel_runtime_pm_put(dev_priv); > mutex_unlock(&dev->struct_mutex); > fail: > drm_gem_object_unreference_unlocked(&obj->base); > -- > 2.0.1 > -- Paulo Zanoni _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
