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/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 8c4fcbb..4c9e92f 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -55,6 +55,9 @@
unsigned int i915_enable_rc6 = 0;
module_param_named(i915_enable_rc6, i915_enable_rc6, int, 0600);
+unsigned int i915_enable_fbc = 0;
+module_param_named(i915_enable_fbc, i915_enable_fbc, int, 0600);
+
unsigned int i915_lvds_downclock = 0;
module_param_named(lvds_downclock, i915_lvds_downclock, int, 0400);
@@ -169,7 +172,7 @@
static const struct intel_device_info intel_ironlake_m_info = {
.gen = 5, .is_mobile = 1,
.need_gfx_hws = 1, .has_hotplug = 1,
- .has_fbc = 0, /* disabled due to buggy hardware */
+ .has_fbc = 1,
.has_bsd_ring = 1,
};