From: Maarten Lankhorst Date: Wed, 24 Feb 2016 10:24:26 +0000 (+0100) Subject: drm/i915: Kill off intel_crtc->atomic.wait_vblank, v6. X-Git-Tag: v4.6-rc1~61^2~20^2~8 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=e8861675c5ccaf3991c3def7cf537eda8f244cb9;p=linux.git drm/i915: Kill off intel_crtc->atomic.wait_vblank, v6. Currently we perform our own wait in post_plane_update, but the atomic core performs another one in wait_for_vblanks. This means that 2 vblanks are done when a fb is changed, which is a bit overkill. Merge them by creating a helper function that takes a crtc mask for the planes to wait on. The broadwell vblank workaround may look gone entirely but this is not the case. pipe_config->wm_changed is set to true when any plane is turned on, which forces a vblank wait. Changes since v1: - Removing the double vblank wait on broadwell moved to its own commit. Changes since v2: - Move out POWER_DOMAIN_MODESET handling to its own commit. Changes since v3: - Do not wait for vblank on legacy cursor updates. (Ville) - Move broadwell vblank workaround comment to page_flip_finished. (Ville) Changes since v4: - Compile fix, legacy_cursor_flip -> *_update. Changes since v5: - Kill brackets. - Add WARN_ON when wait_for_vblanks fails. - Remove extra newlines. - Split the checks whether vblank is needed to a separate function, with comments why a vblank is needed. Signed-off-by: Maarten Lankhorst Link: http://patchwork.freedesktop.org/patch/msgid/56CD84DA.5030507@linux.intel.com Reviewed-by: Paulo Zanoni --- diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c index 4625f8a9ba12..8e579a8505ac 100644 --- a/drivers/gpu/drm/i915/intel_atomic.c +++ b/drivers/gpu/drm/i915/intel_atomic.c @@ -97,6 +97,7 @@ intel_crtc_duplicate_state(struct drm_crtc *crtc) crtc_state->disable_lp_wm = false; crtc_state->disable_cxsr = false; crtc_state->wm_changed = false; + crtc_state->fb_changed = false; return &crtc_state->base; } diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 9a18613a41e8..2e883eded122 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -4792,9 +4792,6 @@ static void intel_post_plane_update(struct intel_crtc *crtc) to_intel_crtc_state(crtc->base.state); struct drm_device *dev = crtc->base.dev; - if (atomic->wait_vblank) - intel_wait_for_vblank(dev, crtc->pipe); - intel_frontbuffer_flip(dev, atomic->fb_bits); crtc->wm.cxsr_allowed = true; @@ -10941,6 +10938,12 @@ static bool page_flip_finished(struct intel_crtc *crtc) if (INTEL_INFO(dev)->gen < 5 && !IS_G4X(dev)) return true; + /* + * BDW signals flip done immediately if the plane + * is disabled, even if the plane enable is already + * armed to occur at the next vblank :( + */ + /* * A DSPSURFLIVE check isn't enough in case the mmio and CS flips * used the same base address. In that case the mmio flip might @@ -11818,6 +11821,9 @@ int intel_plane_atomic_calc_changes(struct drm_crtc_state *crtc_state, if (!was_visible && !visible) return 0; + if (fb != old_plane_state->base.fb) + pipe_config->fb_changed = true; + turn_off = was_visible && (!visible || mode_changed); turn_on = visible && (!was_visible || mode_changed); @@ -11832,11 +11838,8 @@ int intel_plane_atomic_calc_changes(struct drm_crtc_state *crtc_state, pipe_config->wm_changed = true; /* must disable cxsr around plane enable/disable */ - if (plane->type != DRM_PLANE_TYPE_CURSOR) { - if (is_crtc_enabled) - intel_crtc->atomic.wait_vblank = true; + if (plane->type != DRM_PLANE_TYPE_CURSOR) pipe_config->disable_cxsr = true; - } } else if (intel_wm_need_update(plane, plane_state)) { pipe_config->wm_changed = true; } @@ -11850,14 +11853,6 @@ int intel_plane_atomic_calc_changes(struct drm_crtc_state *crtc_state, intel_crtc->atomic.post_enable_primary = turn_on; intel_crtc->atomic.update_fbc = true; - /* - * BDW signals flip done immediately if the plane - * is disabled, even if the plane enable is already - * armed to occur at the next vblank :( - */ - if (turn_on && IS_BROADWELL(dev)) - intel_crtc->atomic.wait_vblank = true; - break; case DRM_PLANE_TYPE_CURSOR: break; @@ -11870,13 +11865,11 @@ int intel_plane_atomic_calc_changes(struct drm_crtc_state *crtc_state, */ if (IS_IVYBRIDGE(dev) && needs_scaling(to_intel_plane_state(plane_state)) && - !needs_scaling(old_plane_state)) { - to_intel_crtc_state(crtc_state)->disable_lp_wm = true; - } else if (turn_off && !mode_changed) { - intel_crtc->atomic.wait_vblank = true; + !needs_scaling(old_plane_state)) + pipe_config->disable_lp_wm = true; + else if (turn_off && !mode_changed) intel_crtc->atomic.update_sprite_watermarks |= 1 << i; - } break; } @@ -13410,6 +13403,71 @@ static int intel_atomic_prepare_commit(struct drm_device *dev, return ret; } +static void intel_atomic_wait_for_vblanks(struct drm_device *dev, + struct drm_i915_private *dev_priv, + unsigned crtc_mask) +{ + unsigned last_vblank_count[I915_MAX_PIPES]; + enum pipe pipe; + int ret; + + if (!crtc_mask) + return; + + for_each_pipe(dev_priv, pipe) { + struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe]; + + if (!((1 << pipe) & crtc_mask)) + continue; + + ret = drm_crtc_vblank_get(crtc); + if (WARN_ON(ret != 0)) { + crtc_mask &= ~(1 << pipe); + continue; + } + + last_vblank_count[pipe] = drm_crtc_vblank_count(crtc); + } + + for_each_pipe(dev_priv, pipe) { + struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe]; + long lret; + + if (!((1 << pipe) & crtc_mask)) + continue; + + lret = wait_event_timeout(dev->vblank[pipe].queue, + last_vblank_count[pipe] != + drm_crtc_vblank_count(crtc), + msecs_to_jiffies(50)); + + WARN_ON(!lret); + + drm_crtc_vblank_put(crtc); + } +} + +static bool needs_vblank_wait(struct intel_crtc_state *crtc_state) +{ + /* fb updated, need to unpin old fb */ + if (crtc_state->fb_changed) + return true; + + /* wm changes, need vblank before final wm's */ + if (crtc_state->wm_changed) + return true; + + /* + * cxsr is re-enabled after vblank. + * This is already handled by crtc_state->wm_changed, + * but added for clarity. + */ + if (crtc_state->disable_cxsr) + return true; + + return false; +} + /** * intel_atomic_commit - commit validated state object * @dev: DRM device @@ -13437,6 +13495,7 @@ static int intel_atomic_commit(struct drm_device *dev, int ret = 0, i; bool hw_check = intel_state->modeset; unsigned long put_domains[I915_MAX_PIPES] = {}; + unsigned crtc_vblank_mask = 0; ret = intel_atomic_prepare_commit(dev, state, async); if (ret) { @@ -13510,8 +13569,9 @@ static int intel_atomic_commit(struct drm_device *dev, for_each_crtc_in_state(state, crtc, crtc_state, i) { struct intel_crtc *intel_crtc = to_intel_crtc(crtc); bool modeset = needs_modeset(crtc->state); - bool update_pipe = !modeset && - to_intel_crtc_state(crtc->state)->update_pipe; + struct intel_crtc_state *pipe_config = + to_intel_crtc_state(crtc->state); + bool update_pipe = !modeset && pipe_config->update_pipe; if (modeset && crtc->state->active) { update_scanline_offset(to_intel_crtc(crtc)); @@ -13528,14 +13588,18 @@ static int intel_atomic_commit(struct drm_device *dev, (crtc->state->planes_changed || update_pipe)) drm_atomic_helper_commit_planes_on_crtc(crtc_state); - intel_post_plane_update(intel_crtc); + if (pipe_config->base.active && needs_vblank_wait(pipe_config)) + crtc_vblank_mask |= 1 << i; } /* FIXME: add subpixel order */ - drm_atomic_helper_wait_for_vblanks(dev, state); + if (!state->legacy_cursor_update) + intel_atomic_wait_for_vblanks(dev, dev_priv, crtc_vblank_mask); for_each_crtc_in_state(state, crtc, crtc_state, i) { + intel_post_plane_update(to_intel_crtc(crtc)); + if (put_domains[i]) modeset_put_power_domains(dev_priv, put_domains[i]); } diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 4852049c9ab3..35301664a908 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -379,6 +379,7 @@ struct intel_crtc_state { bool update_pipe; /* can a fast modeset be performed? */ bool disable_cxsr; bool wm_changed; /* watermarks are updated */ + bool fb_changed; /* fb on any of the planes is changed */ /* Pipe source size (ie. panel fitter input size) * All planes will be positioned inside this space, @@ -547,7 +548,6 @@ struct intel_crtc_atomic_commit { /* Sleepable operations to perform after commit */ unsigned fb_bits; - bool wait_vblank; bool post_enable_primary; unsigned update_sprite_watermarks;