drm/amd/powerplay: Use defined constants for minium engine clock

Replacing magic numbers in calculation of sleep divider id for fiji
and polaris.
Signed-off-by: NNils Wallménius <nils.wallmenius@gmail.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -1903,7 +1903,8 @@ static uint8_t fiji_get_sleep_divider_id_from_clock(struct pp_hwmgr *hwmgr,
 {
 	uint8_t i;
 	uint32_t temp;
-	uint32_t min = clock_insr > 2500 ? clock_insr : 2500;
+	uint32_t min = clock_insr > FIJI_MINIMUM_ENGINE_CLOCK ?
+			clock_insr : FIJI_MINIMUM_ENGINE_CLOCK;
 
 	PP_ASSERT_WITH_CODE((clock >= min), "Engine clock can't satisfy stutter requirement!", return 0);
 	for (i = FIJI_MAX_DEEPSLEEP_DIVIDER_ID;  ; i--) {

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

@@ -1175,11 +1175,11 @@ static int polaris10_populate_single_graphic_level(struct pp_hwmgr *hwmgr,
 	if (phm_cap_enabled(hwmgr->platformDescriptor.platformCaps, PHM_PlatformCaps_SclkDeepSleep))
 		level->DeepSleepDivId = PhwFiji_GetSleepDividerIdFromClock(hwmgr, clock, minClocks.engineClockInSR);
 	*/
-	PP_ASSERT_WITH_CODE((clock >= 2500), "Engine clock can't satisfy stutter requirement!", return 0);
+	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);
 
-		if (temp >= 2500 || i == 0)
+		if (temp >= POLARIS10_MINIMUM_ENGINE_CLOCK || i == 0)
 			break;
 	}