drm/amd/pm: make the error log more clear for fine grain tuning function

This patch is to make the error log more clear for fine grain tuning
function, it covers Raven/Raven2/Picasso/Renoir/Vangogh.
The fine grain tuning function uses the sysfs file -- pp_od_clk_voltage,
but only when another sysfs file -- power_dpm_force_performance_level is
switched to "manual" mode, it is allowed to access "pp_od_clk_voltage".
Signed-off-by: Xiaojian Du <Xiaojian.Du@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Acked-by: Kevin Wang <kevin1.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu10_hwmgr.c

@@ -1487,7 +1487,7 @@ static int smu10_set_fine_grain_clk_vol(struct pp_hwmgr *hwmgr,
 	}
 
 	if (!smu10_data->fine_grain_enabled) {
-		pr_err("Fine grain not started\n");
+		pr_err("pp_od_clk_voltage is not accessible if power_dpm_force_perfomance_level is not in manual mode!\n");
 		return -EINVAL;
 	}
 

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

@@ -1461,7 +1461,8 @@ static int vangogh_od_edit_dpm_table(struct smu_context *smu, enum PP_OD_DPM_TAB
 	struct smu_dpm_context *smu_dpm_ctx = &(smu->smu_dpm);
 
 	if (!(smu_dpm_ctx->dpm_level == AMD_DPM_FORCED_LEVEL_MANUAL)) {
-		dev_warn(smu->adev->dev, "Fine grain is not enabled!\n");
+		dev_warn(smu->adev->dev,
+			"pp_od_clk_voltage is not accessible if power_dpm_force_perfomance_level is not in manual mode!\n");
 		return -EINVAL;
 	}
 

drivers/gpu/drm/amd/pm/swsmu/smu12/renoir_ppt.c

@@ -350,7 +350,8 @@ static int renoir_od_edit_dpm_table(struct smu_context *smu,
 	struct smu_dpm_context *smu_dpm_ctx = &(smu->smu_dpm);
 
 	if (!(smu_dpm_ctx->dpm_level == AMD_DPM_FORCED_LEVEL_MANUAL)) {
-		dev_warn(smu->adev->dev, "Fine grain is not enabled!\n");
+		dev_warn(smu->adev->dev,
+			"pp_od_clk_voltage is not accessible if power_dpm_force_perfomance_level is not in manual mode!\n");
 		return -EINVAL;
 	}