drm/i915: Remove the MI_FLUSH_ENABLE setting.

We have always been using the wrong bit -- it's bit 12.  However, the
bit also doesn't do anything -- hardware has always accepted the
MI_FLUSH command even when it was specced not to.

Given that there is only one MI_FLUSH emitted in all of the driver
stack on gen6+ (in i965_video.c of the 2d driver, and it should be
using other code to do its flush instead), just remove the MI_FLUSH
enable instead of trying to fix it.

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 0 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 77e729d4e4f0..b3da17af8997 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -399,8 +399,6 @@ static int init_render_ring(struct intel_ring_buffer *ring)
 
         if (INTEL_INFO(dev)->gen > 3) {
                 int mode = VS_TIMER_DISPATCH << 16 | VS_TIMER_DISPATCH;
-                if (IS_GEN6(dev) || IS_GEN7(dev))
-                        mode |= MI_FLUSH_ENABLE << 16 | MI_FLUSH_ENABLE;
                 I915_WRITE(MI_MODE, mode);
                 if (IS_GEN7(dev))
                         I915_WRITE(GFX_MODE_GEN7,