[PATCH] drm/panthor: Remove dead code in mmu_hw_do_operation_locked

[Steven Price]

The only callers to mmu_hw_do_operation_locked() pass an 'op' of either
AS_COMAND_FLUSH_MEM or AS_COMMAND_FLUSH_PT. So remove the code paths
that test for other operations and add a drm_WARN_ON() to catch the
posibility of others appearing the future.

Suggested-by: Daniel Stone <dan...@fooishbar.org>
Signed-off-by: Steven Price <steven.pr...@arm.com>
---
 drivers/gpu/drm/panthor/panthor_mmu.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/panthor/panthor_mmu.c 
b/drivers/gpu/drm/panthor/panthor_mmu.c
index 367c89aca558..b16f44aec725 100644
--- a/drivers/gpu/drm/panthor/panthor_mmu.c
+++ b/drivers/gpu/drm/panthor/panthor_mmu.c
@@ -612,17 +612,12 @@ static int mmu_hw_do_operation_locked(struct 
panthor_device *ptdev, int as_nr,
         * power it up
         */
 
-       if (op != AS_COMMAND_UNLOCK)
-               lock_region(ptdev, as_nr, iova, size);
+       drm_WARN_ON(&ptdev->base,
+                   op != AS_COMMAND_FLUSH_MEM && op != AS_COMMAND_FLUSH_PT);
 
-       if (op == AS_COMMAND_FLUSH_MEM || op == AS_COMMAND_FLUSH_PT)
-               return mmu_hw_do_flush_on_gpu_ctrl(ptdev, as_nr, op);
+       lock_region(ptdev, as_nr, iova, size);
 
-       /* Run the MMU operation */
-       write_cmd(ptdev, as_nr, op);
-
-       /* Wait for the flush to complete */
-       return wait_ready(ptdev, as_nr);
+       return mmu_hw_do_flush_on_gpu_ctrl(ptdev, as_nr, op);
 }
 
 static int mmu_hw_do_operation(struct panthor_vm *vm,
-- 
2.39.5