drm/amd/display: Remove unsued mutex and spinlock.

They seem to be obsolete.
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -411,12 +411,6 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
 	/* Zero all the fields */
 	memset(&init_data, 0, sizeof(init_data));
 
-	/* initialize DAL's lock (for SYNC context use) */
-	spin_lock_init(&adev->dm.dal_lock);
-
-	/* initialize DAL's mutex */
-	mutex_init(&adev->dm.dal_mutex);
-
 	if(amdgpu_dm_irq_init(adev)) {
 		DRM_ERROR("amdgpu: failed to initialize DM IRQ support.\n");
 		goto error;

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

@@ -85,8 +85,6 @@ struct amdgpu_display_manager {
 	struct dal *dal;
 	struct dc *dc;
 	struct cgs_device *cgs_device;
-	/* lock to be used when DAL is called from SYNC IRQ context */
-	spinlock_t dal_lock;
 
 	struct amdgpu_device *adev;	/*AMD base driver*/
 	struct drm_device *ddev;	/*DRM base driver*/
@@ -123,13 +121,6 @@ struct amdgpu_display_manager {
 	struct list_head timer_handler_list;
 	struct workqueue_struct *timer_workqueue;
 
-	/* Use dal_mutex for any activity which is NOT syncronized by
-	 * DRM mode setting locks.
-	 * For example: amdgpu_dm_hpd_low_irq() calls into DAL *without*
-	 * DRM mode setting locks being acquired. This is where dal_mutex
-	 * is acquired before calling into DAL. */
-	struct mutex dal_mutex;
-
 	struct backlight_device *backlight_dev;
 
 	const struct dc_link *backlight_link;