From 0dd81544c9dd1ba867e7cd2e18d719437b3c97c1 Mon Sep 17 00:00:00 2001 From: Paulo Zanoni Date: Tue, 19 Jan 2016 11:35:39 -0200 Subject: [PATCH] drm/i915/fbc: don't use the frontbuffer tracking subsystem for flips Before this patch, page flips would call intel_frontbuffer_flip() and intel_frontbuffer_flip_complete(), which would call intel_fbc_flush(), which would call intel_fbc_update(). The problem is that drawing operations also trigger intel_fbc_flush() calls, so it's not guaranteed that we have the CRTC and FB locks grabbed when intel_fbc_flush() happens, since the call trace may come from the rendering path. We're trying to make the FBC code grab the appropriate CRTC/FB locks, so split the drawing and the flipping logic in order to achieve that in later patches. So now the frontbuffer tracking code is just going to be used for frontbuffer drawing, and intel_fbc_update() is going to be used directly for actual page flips. As a note, we don't need to call intel_fbc_flip() during the two places where we call intel_frontbuffer_flip() since in one of them we already have an intel_fbc_update() call, and in the other we have the planes disabled. Reviewed-by: Maarten Lankhorst Signed-off-by: Paulo Zanoni Link: http://patchwork.freedesktop.org/patch/msgid/1453210558-7875-7-git-send-email-paulo.r.zanoni@intel.com --- drivers/gpu/drm/i915/intel_display.c | 1 + drivers/gpu/drm/i915/intel_fbc.c | 10 ++++------ 2 files changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 304fc9637026..d56b9347543b 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -10912,6 +10912,7 @@ static void intel_unpin_work_fn(struct work_struct *__work) mutex_unlock(&dev->struct_mutex); intel_frontbuffer_flip_complete(dev, to_intel_plane(primary)->frontbuffer_bit); + intel_fbc_update(crtc); drm_framebuffer_unreference(work->old_fb); BUG_ON(atomic_read(&crtc->unpin_work_count) == 0); diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c index a0bdcef6bf27..8c765f699061 100644 --- a/drivers/gpu/drm/i915/intel_fbc.c +++ b/drivers/gpu/drm/i915/intel_fbc.c @@ -989,7 +989,7 @@ void intel_fbc_invalidate(struct drm_i915_private *dev_priv, if (!fbc_supported(dev_priv)) return; - if (origin == ORIGIN_GTT) + if (origin == ORIGIN_GTT || origin == ORIGIN_FLIP) return; mutex_lock(&fbc->lock); @@ -1015,7 +1015,7 @@ void intel_fbc_flush(struct drm_i915_private *dev_priv, if (!fbc_supported(dev_priv)) return; - if (origin == ORIGIN_GTT) + if (origin == ORIGIN_GTT || origin == ORIGIN_FLIP) return; mutex_lock(&fbc->lock); @@ -1023,12 +1023,10 @@ void intel_fbc_flush(struct drm_i915_private *dev_priv, fbc->busy_bits &= ~frontbuffer_bits; if (!fbc->busy_bits && fbc->enabled) { - if (origin != ORIGIN_FLIP && fbc->active) { + if (fbc->active) intel_fbc_recompress(dev_priv); - } else { - __intel_fbc_deactivate(dev_priv); + else __intel_fbc_update(fbc->crtc); - } } mutex_unlock(&fbc->lock); -- 2.20.1