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/amdgpu/ci_dpm.c

@@ -2560,7 +2560,7 @@ static u8 ci_get_sleep_divider_id_from_clock(struct amdgpu_device *adev,
 		return 0;
 
 	for (i = CISLAND_MAX_DEEPSLEEP_DIVIDER_ID;  ; i--) {
-		tmp = sclk / (1 << i);
+		tmp = sclk >> i;
 		if (tmp >= min || i == 0)
 			break;
 	}

drivers/gpu/drm/amd/amdgpu/kv_dpm.c

@@ -135,11 +135,6 @@ static void sumo_take_smu_control(struct amdgpu_device *adev, bool enable)
 #endif
 }
 
-static u32 sumo_get_sleep_divider_from_id(u32 id)
-{
-	return 1 << id;
-}
-
 static void sumo_construct_sclk_voltage_mapping_table(struct amdgpu_device *adev,
 						      struct sumo_sclk_voltage_mapping_table *sclk_voltage_mapping_table,
 						      ATOM_AVAILABLE_SCLK_LIST *table)
@@ -2185,7 +2180,7 @@ static u8 kv_get_sleep_divider_id_from_clock(struct amdgpu_device *adev,
 		return 0;
 
 	for (i = KV_MAX_DEEPSLEEP_DIVIDER_ID; i > 0; i--) {
-		temp = sclk / sumo_get_sleep_divider_from_id(i);
+		temp = sclk >> i;
 		if (temp >= min)
 			break;
 	}

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;