drm/i915: refactor & correct GEN6 PIPE_CONTROL code

The code in gen6_render_ring_flush() wasn't quite right; whereas the
workarounds were emitted with GFX_OP_PIPE_CONTROL(5) (allowing for a
QWord write), the final PIPE_CONTROL used GFX_OP_PIPE_CONTROL(4) even
though it would also have the PIPE_CONTROL_QW_WRITE flag set. This may
(should?) have resulted in the next instruction word being consumed as
data, or the PIPE_CONTROL not working as intended due to the flags-vs-
length mismatch.

The refactored code has a Gen6-specific function which will emit a
complete PIPE_CONTROL sequence, with the correct number of extension
DWords. The emit-workarounds and emit-flush functions are then trivially
expressed as calls to the new low-level function.

Signed-off-by: Dave Gordon <david.s.gordon@intel.com>

0 files changed, 0 insertions, 0 deletions