From: Paulo Zanoni <paulo.r.zan...@intel.com>
Because that is probably not very a good idea: if we used the stolen
memory for more things, there could be a risk that someone would
"allocate" the memory that the HW is still using as the CFB while FBC
was still enabled.
Signed-off-by: Paulo Zanoni <paulo.r.zan...@intel.com>
---
drivers/gpu/drm/i915/i915_gem_stolen.c | 3 +++
drivers/gpu/drm/i915/intel_fbc.c | 14 +++++++-------
2 files changed, 10 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c
b/drivers/gpu/drm/i915/i915_gem_stolen.c
index d02c102..f84c5f3 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -198,6 +198,8 @@ static int i915_setup_compression(struct drm_device *dev,
int size, int fb_cpp)
struct drm_mm_node *uninitialized_var(compressed_llb);
int ret;
+ WARN_ON(dev_priv->fbc.enabled);
+
ret = find_compression_threshold(dev, &dev_priv->fbc.compressed_fb,
size, fb_cpp);
if (!ret)
@@ -268,6 +270,7 @@ void i915_gem_stolen_cleanup_compression(struct drm_device
*dev)
if (dev_priv->fbc.compressed_fb.allocated == 0)
return;
+ WARN_ON(dev_priv->fbc.enabled);
drm_mm_remove_node(&dev_priv->fbc.compressed_fb);
if (dev_priv->fbc.compressed_llb) {
diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
index 1b10b06..83d3c8a 100644
--- a/drivers/gpu/drm/i915/intel_fbc.c
+++ b/drivers/gpu/drm/i915/intel_fbc.c
@@ -593,13 +593,6 @@ void intel_fbc_update(struct drm_device *dev)
if (in_dbg_master())
goto out_disable;
- if (i915_gem_stolen_setup_compression(dev, obj->base.size,
-
drm_format_plane_cpp(fb->pixel_format, 0))) {
- if (set_no_fbc_reason(dev_priv, FBC_STOLEN_TOO_SMALL))
- DRM_DEBUG_KMS("framebuffer too large, disabling
compression\n");
- goto out_disable;
- }
-
/* If the scanout has not changed, don't modify the FBC settings.
* Note that we make the fundamental assumption that the fb->obj
* cannot be unpinned (and have its GTT offset and fence revoked)
@@ -638,6 +631,13 @@ void intel_fbc_update(struct drm_device *dev)
intel_fbc_disable(dev);
}
+ if (i915_gem_stolen_setup_compression(dev, obj->base.size,
+
drm_format_plane_cpp(fb->pixel_format, 0))) {
+ if (set_no_fbc_reason(dev_priv, FBC_STOLEN_TOO_SMALL))
+ DRM_DEBUG_KMS("framebuffer too large, disabling
compression\n");
+ return;
+ }
+
intel_fbc_enable(crtc);
dev_priv->fbc.no_fbc_reason = FBC_OK;
return;
--
2.1.3
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