[PATCH 3.16 002/366] drm/i915: Log a message when rejecting LRM to OACONTROL

[Ben Hutchings]

3.16.60-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Brad Volkin <bradley.d.volkin@xxxxxxxxx>

commit 00caf0199f66871b0e2c28d7c2079de0ce1d646c upstream.

The other paths in the command parser that reject a batch all
log a message indicating the reason. We simply missed this one.

Signed-off-by: Brad Volkin <bradley.d.volkin@xxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_cmd_parser.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/i915_cmd_parser.c
+++ b/drivers/gpu/drm/i915/i915_cmd_parser.c
@@ -887,8 +887,10 @@ static bool check_cmd(const struct intel
 		 * OACONTROL writes to only MI_LOAD_REGISTER_IMM commands.
 		 */
 		if (reg_addr == OACONTROL) {
-			if (desc->cmd.value == MI_LOAD_REGISTER_MEM)
+			if (desc->cmd.value == MI_LOAD_REGISTER_MEM) {
+				DRM_DEBUG_DRIVER("CMD: Rejected LRM to OACONTROL\n");
 				return false;
+			}
 
 			if (desc->cmd.value == MI_LOAD_REGISTER_IMM(1))
 				*oacontrol_set = (cmd[2] != 0);