On Gen9 chromebooks, we are seeing the screen shows several
large blue horizontal stripes over the top. Also, corruption happens
when we switch from a chrome browser tab to VT2 mode(by pressing Ctrl+Alt+F2)
and then back to chrome tab.
As per the display workaround #1200, FBC needs wait for vblank
before enabling and before disabling FBC.
Signed-off-by: Gaurav K Singh <gaurav.k.singh@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_fbc.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index 16ed44bfd734..71f2568ea5a3 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -1097,6 +1097,8 @@ void intel_fbc_enable(struct intel_crtc *crtc,
if (fbc->crtc == crtc) {
WARN_ON(!crtc_state->enable_fbc);
WARN_ON(fbc->active);
+ if (IS_GEN9(dev_priv))
+ intel_wait_for_vblank(dev_priv, crtc->pipe);
}
goto out;
}
@@ -1137,8 +1139,11 @@ void intel_fbc_disable(struct intel_crtc *crtc)
return;
mutex_lock(&fbc->lock);
- if (fbc->crtc == crtc)
+ if (fbc->crtc == crtc) {
__intel_fbc_disable(dev_priv);
+ if (IS_GEN9(dev_priv))
+ intel_wait_for_vblank(dev_priv, crtc->pipe);
+ }
mutex_unlock(&fbc->lock);
}
--
1.9.1
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