[PATCH] drm/amd/powerplay: hint and error out when prerequisite not meet

[Evan Quan]

Do not ignore the error silently. Otherwise user may thought it
was executed successfully.

Change-Id: I4ac0cff5918d53d1d737f1c2fb1a4f81917dbf56
Signed-off-by: Evan Quan <evan.quan at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c        | 14 ++++++++++----
 drivers/gpu/drm/amd/powerplay/amd_powerplay.c |  4 +++-
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index 5e071917594f..e0a9f02d68d1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -756,8 +756,11 @@ static ssize_t amdgpu_set_pp_dpm_sclk(struct device *dev,
 	if (ret)
 		return ret;
 
-	if (adev->powerplay.pp_funcs->force_clock_level)
-		amdgpu_dpm_force_clock_level(adev, PP_SCLK, mask);
+	if (adev->powerplay.pp_funcs->force_clock_level) {
+		ret = amdgpu_dpm_force_clock_level(adev, PP_SCLK, mask);
+		if (ret)
+			return ret;
+	}
 
 	return count;
 }
@@ -789,8 +792,11 @@ static ssize_t amdgpu_set_pp_dpm_mclk(struct device *dev,
 	if (ret)
 		return ret;
 
-	if (adev->powerplay.pp_funcs->force_clock_level)
-		amdgpu_dpm_force_clock_level(adev, PP_MCLK, mask);
+	if (adev->powerplay.pp_funcs->force_clock_level) {
+		ret = amdgpu_dpm_force_clock_level(adev, PP_MCLK, mask);
+		if (ret)
+			return ret;
+	}
 
 	return count;
 }
diff --git a/drivers/gpu/drm/amd/powerplay/amd_powerplay.c b/drivers/gpu/drm/amd/powerplay/amd_powerplay.c
index 27215e4b488b..285375b96ea4 100644
--- a/drivers/gpu/drm/amd/powerplay/amd_powerplay.c
+++ b/drivers/gpu/drm/amd/powerplay/amd_powerplay.c
@@ -727,8 +727,10 @@ static int pp_dpm_force_clock_level(void *handle,
 	mutex_lock(&hwmgr->smu_lock);
 	if (hwmgr->dpm_level == AMD_DPM_FORCED_LEVEL_MANUAL)
 		ret = hwmgr->hwmgr_func->force_clock_level(hwmgr, type, mask);
-	else
+	else {
+		pr_info_ratelimited("Force clock level setting is for manual dpm mode only.\n");
 		ret = -EINVAL;
+	}
 	mutex_unlock(&hwmgr->smu_lock);
 	return ret;
 }
-- 
2.20.1