static bool intel_fbc_can_activate(struct intel_crtc *crtc)
{
struct drm_i915_private *dev_priv = crtc->base.dev->dev_private;
struct intel_fbc *fbc = &dev_priv->fbc;
struct intel_fbc_state_cache *cache = &fbc->state_cache;
if (!cache->plane.visible) {
fbc->no_fbc_reason = "primary plane not visible";
return false;
}
if ((cache->crtc.mode_flags & DRM_MODE_FLAG_INTERLACE) ||
(cache->crtc.mode_flags & DRM_MODE_FLAG_DBLSCAN)) {
fbc->no_fbc_reason = "incompatible mode";
return false;
}
if (!intel_fbc_hw_tracking_covers_screen(crtc)) {
fbc->no_fbc_reason = "mode too large for compression";
return false;
}
/* The use of a CPU fence is mandatory in order to detect writes
* by the CPU to the scanout and trigger updates to the FBC.
*/
if (cache->fb.tiling_mode != I915_TILING_X ||
cache->fb.fence_reg == I915_FENCE_REG_NONE) {
fbc->no_fbc_reason = "framebuffer not tiled or fenced";
return false;
}
if (INTEL_INFO(dev_priv)->gen <= 4 && !IS_G4X(dev_priv) &&
cache->plane.rotation != BIT(DRM_ROTATE_0)) {
fbc->no_fbc_reason = "rotation unsupported";
return false;
}
if (!stride_is_valid(dev_priv, cache->fb.stride)) {
fbc->no_fbc_reason = "framebuffer stride not supported";
return false;
}
if (!pixel_format_is_valid(dev_priv, cache->fb.pixel_format)) {
fbc->no_fbc_reason = "pixel format is invalid";
return false;
}
/* WaFbcExceedCdClockThreshold:hsw,bdw */
if ((IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) &&
cache->crtc.hsw_bdw_pixel_rate >= dev_priv->cdclk_freq * 95 / 100) {
fbc->no_fbc_reason = "pixel rate is too big";
return false;
}
/* It is possible for the required CFB size change without a
* crtc->disable + crtc->enable since it is possible to change the
* stride without triggering a full modeset. Since we try to
* over-allocate the CFB, there's a chance we may keep FBC enabled even
* if this happens, but if we exceed the current CFB size we'll have to
* disable FBC. Notice that it would be possible to disable FBC, wait
* for a frame, free the stolen node, then try to reenable FBC in case
* we didn't get any invalidate/deactivate calls, but this would require
* a lot of tracking just for a specific case. If we conclude it's an
* important case, we can implement it later. */
if (intel_fbc_calculate_cfb_size(dev_priv, &fbc->state_cache) >
fbc->compressed_fb.size * fbc->threshold) {
fbc->no_fbc_reason = "CFB requirements changed";
return false;
}
return true;
}
static bool intel_fbc_can_activate(struct intel_crtc *crtc)
{
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
struct intel_fbc *fbc = &dev_priv->fbc;
struct intel_fbc_state_cache *cache = &fbc->state_cache;
/* We don't need to use a state cache here since this information is
* global for all CRTC.
*/
if (fbc->underrun_detected) {
fbc->no_fbc_reason = "underrun detected";
return false;
}
if (!cache->vma) {
fbc->no_fbc_reason = "primary plane not visible";
return false;
}
if ((cache->crtc.mode_flags & DRM_MODE_FLAG_INTERLACE) ||
(cache->crtc.mode_flags & DRM_MODE_FLAG_DBLSCAN)) {
fbc->no_fbc_reason = "incompatible mode";
return false;
}
if (!intel_fbc_hw_tracking_covers_screen(crtc)) {
fbc->no_fbc_reason = "mode too large for compression";
return false;
}
/* The use of a CPU fence is mandatory in order to detect writes
* by the CPU to the scanout and trigger updates to the FBC.
*
* Note that is possible for a tiled surface to be unmappable (and
* so have no fence associated with it) due to aperture constaints
* at the time of pinning.
*/
if (!cache->vma->fence) {
fbc->no_fbc_reason = "framebuffer not tiled or fenced";
return false;
}
if (INTEL_GEN(dev_priv) <= 4 && !IS_G4X(dev_priv) &&
cache->plane.rotation != DRM_MODE_ROTATE_0) {
fbc->no_fbc_reason = "rotation unsupported";
return false;
}
if (!stride_is_valid(dev_priv, cache->fb.stride)) {
fbc->no_fbc_reason = "framebuffer stride not supported";
return false;
}
if (!pixel_format_is_valid(dev_priv, cache->fb.format->format)) {
fbc->no_fbc_reason = "pixel format is invalid";
return false;
}
/* WaFbcExceedCdClockThreshold:hsw,bdw */
if ((IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) &&
cache->crtc.hsw_bdw_pixel_rate >= dev_priv->cdclk.hw.cdclk * 95 / 100) {
fbc->no_fbc_reason = "pixel rate is too big";
return false;
}
/* It is possible for the required CFB size change without a
* crtc->disable + crtc->enable since it is possible to change the
* stride without triggering a full modeset. Since we try to
* over-allocate the CFB, there's a chance we may keep FBC enabled even
* if this happens, but if we exceed the current CFB size we'll have to
* disable FBC. Notice that it would be possible to disable FBC, wait
* for a frame, free the stolen node, then try to reenable FBC in case
* we didn't get any invalidate/deactivate calls, but this would require
* a lot of tracking just for a specific case. If we conclude it's an
* important case, we can implement it later. */
if (intel_fbc_calculate_cfb_size(dev_priv, &fbc->state_cache) >
fbc->compressed_fb.size * fbc->threshold) {
fbc->no_fbc_reason = "CFB requirements changed";
return false;
}
return true;
}