drm/i915: add fbc enable flag, but disable by default
FBC has too many corner cases that we don't currently deal with, so
disable it by default so we can enable more important features like RC6,
which conflicts in some configurations.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=31742
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Keith Packard <keithp@keithp.com>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 5ec74df..81ad654 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1731,6 +1731,11 @@
intel_fb = to_intel_framebuffer(fb);
obj = intel_fb->obj;
+ if (!i915_enable_fbc) {
+ DRM_DEBUG_KMS("fbc disabled per module param (default off)\n");
+ dev_priv->no_fbc_reason = FBC_MODULE_PARAM;
+ goto out_disable;
+ }
if (intel_fb->obj->base.size > dev_priv->cfb_size) {
DRM_DEBUG_KMS("framebuffer too large, disabling "
"compression\n");