[Intel-gfx] [PATCH v3 4/8] drm/i915: Disable framebuffer compression for i915 driver in VM

[Yu Zhang]

Framebuffer compression is disabled when driver detects it's
running in a Intel GVT-g enlightened VM, because FBC is not
emulated and there is no stolen memory for a vGPU.

v2:
take Chris' comments:
	- move the code into intel_update_fbc()

Signed-off-by: Yu Zhang <yu.c.zhang at linux.intel.com>
Signed-off-by: Jike Song <jike.song at intel.com>
Signed-off-by: Zhiyuan Lv <zhiyuan.lv at intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 7a69eba..3bc5d93 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -544,6 +544,10 @@ void intel_update_fbc(struct drm_device *dev)
 		return;
 	}
 
+	/* disable framebuffer compression in vGPU */
+	if (intel_vgpu_active(dev))
+		i915.enable_fbc = 0;
+
 	/*
 	 * If FBC is already on, we just have to verify that we can
 	 * keep it that way...
-- 
1.9.1