drm/amdgpu: Simplify calculation in *get_sleep_divider_id_from_clock

a / (1 << b) is equivalent to a >> b for unsigned values

Signed-off-by: Nils Wallménius <nils.wallmenius@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/hwmgr/fiji_hwmgr.c

@@ -1907,7 +1907,7 @@ static uint8_t fiji_get_sleep_divider_id_from_clock(struct pp_hwmgr *hwmgr,
 
 	PP_ASSERT_WITH_CODE((clock >= min), "Engine clock can't satisfy stutter requirement!", return 0);
 	for (i = FIJI_MAX_DEEPSLEEP_DIVIDER_ID;  ; i--) {
-		temp = clock / (1UL << i);
+		temp = clock >> i;
 
 		if (temp >= min || i == 0)
 			break;

drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c

@@ -1177,7 +1177,7 @@ static int polaris10_populate_single_graphic_level(struct pp_hwmgr *hwmgr,
 	*/
 	PP_ASSERT_WITH_CODE((clock >= POLARIS10_MINIMUM_ENGINE_CLOCK), "Engine clock can't satisfy stutter requirement!", return 0);
 	for (i = POLARIS10_MAX_DEEPSLEEP_DIVIDER_ID;  ; i--) {
-		temp = clock / (1UL << i);
+		temp = clock >> i;
 
 		if (temp >= POLARIS10_MINIMUM_ENGINE_CLOCK || i == 0)
 			break;

drivers/gpu/drm/amd/powerplay/hwmgr/tonga_hwmgr.c

@@ -2426,7 +2426,7 @@ static uint8_t tonga_get_sleep_divider_id_from_clock(struct pp_hwmgr *hwmgr,
 			"Engine clock can't satisfy stutter requirement!", return 0);
 
 	for (i = TONGA_MAX_DEEPSLEEP_DIVIDER_ID;; i--) {
-		temp = engine_clock / (1 << i);
+		temp = engine_clock >> i;
 
 		if(temp >= min || i == 0)
 			break;