drm/amd/pm: revise the umc hybrid cdr workaround

Drop the unused message(SMU_MSG_DAL_DISABLE_DUMMY_PSTATE_CHANGE).
And do not apply this workaround when the max uclk frequency
is greater than 750Mhz.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c

@@ -2181,18 +2181,6 @@ static int navi10_run_btc(struct smu_context *smu)
 	return ret;
 }
 
-static int navi10_dummy_pstate_control(struct smu_context *smu, bool enable)
-{
-	int result = 0;
-
-	if (!enable)
-		result = smu_cmn_send_smc_msg(smu, SMU_MSG_DAL_DISABLE_DUMMY_PSTATE_CHANGE, NULL);
-	else
-		result = smu_cmn_send_smc_msg(smu, SMU_MSG_DAL_ENABLE_DUMMY_PSTATE_CHANGE, NULL);
-
-	return result;
-}
-
 static inline bool navi10_need_umc_cdr_12gbps_workaround(struct amdgpu_device *adev)
 {
 	if (adev->asic_type != CHIP_NAVI10)
@@ -2208,32 +2196,32 @@ static inline bool navi10_need_umc_cdr_12gbps_workaround(struct amdgpu_device *a
 		return false;
 }
 
-static int navi10_disable_umc_cdr_12gbps_workaround(struct smu_context *smu)
+static int navi10_umc_hybrid_cdr_workaround(struct smu_context *smu)
 {
 	uint32_t uclk_count, uclk_min, uclk_max;
-	uint32_t smu_version;
 	int ret = 0;
 
-	if (!navi10_need_umc_cdr_12gbps_workaround(smu->adev))
-		return 0;
-
-	ret = smu_cmn_get_smc_version(smu, NULL, &smu_version);
-	if (ret)
-		return ret;
-
-	/* This workaround is available only for 42.50 or later SMC firmwares */
-	if (smu_version < 0x2A3200)
+	/* This workaround can be applied only with uclk dpm enabled */
+	if (!smu_cmn_feature_is_enabled(smu, SMU_FEATURE_DPM_UCLK_BIT))
 		return 0;
 
 	ret = smu_v11_0_get_dpm_level_count(smu, SMU_UCLK, &uclk_count);
 	if (ret)
 		return ret;
 
-	ret = smu_v11_0_get_dpm_freq_by_index(smu, SMU_UCLK, (uint16_t)0, &uclk_min);
+	ret = smu_v11_0_get_dpm_freq_by_index(smu, SMU_UCLK, (uint16_t)(uclk_count - 1), &uclk_max);
 	if (ret)
 		return ret;
 
-	ret = smu_v11_0_get_dpm_freq_by_index(smu, SMU_UCLK, (uint16_t)(uclk_count - 1), &uclk_max);
+	/*
+	 * The NAVI10_UMC_HYBRID_CDR_WORKAROUND_UCLK_THRESHOLD is 750Mhz.
+	 * This workaround is needed only when the max uclk frequency
+	 * not greater than that.
+	 */
+	if (uclk_max > 0x2EE)
+		return 0;
+
+	ret = smu_v11_0_get_dpm_freq_by_index(smu, SMU_UCLK, (uint16_t)0, &uclk_min);
 	if (ret)
 		return ret;
 
@@ -2250,8 +2238,27 @@ static int navi10_disable_umc_cdr_12gbps_workaround(struct smu_context *smu)
 	/*
 	 * In this case, SMU already disabled dummy pstate during enablement
 	 * of UCLK DPM, we have to re-enabled it.
-	 * */
-	return navi10_dummy_pstate_control(smu, true);
+	 */
+	return smu_cmn_send_smc_msg(smu, SMU_MSG_DAL_ENABLE_DUMMY_PSTATE_CHANGE, NULL);
+}
+
+static int navi10_disable_umc_cdr_12gbps_workaround(struct smu_context *smu)
+{
+	uint32_t smu_version;
+	int ret = 0;
+
+	if (!navi10_need_umc_cdr_12gbps_workaround(smu->adev))
+		return 0;
+
+	ret = smu_cmn_get_smc_version(smu, NULL, &smu_version);
+	if (ret)
+		return ret;
+
+	/* This workaround is available only for 42.50 or later SMC firmwares */
+	if (smu_version < 0x2A3200)
+		return 0;
+
+	return navi10_umc_hybrid_cdr_workaround(smu);
 }
 
 static void navi10_fill_i2c_req(SwI2cRequest_t  *req, bool write,