[PATCH 2/2] drm/amd/pm: fix the crash after runtime pm resume

[Kenneth Feng]

Some features are still disabled after runtime pm resume. This can take the hardware back.
Unlike other projects, this doesn't need pptable retransfer.

Signed-off-by: Kenneth Feng <kenneth.feng at amd.com>
---
 drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
index 39990790ed67..ebd50f144c5d 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
@@ -914,11 +914,14 @@ static int smu_smc_hw_setup(struct smu_context *smu)
 {
 	struct amdgpu_device *adev = smu->adev;
 	uint32_t pcie_gen = 0, pcie_width = 0;
-	int ret;
+	int ret = 0;
 
 	if (adev->in_suspend && smu_is_dpm_running(smu)) {
 		dev_info(adev->dev, "dpm has been enabled\n");
-		return 0;
+		/* this is needed specifically */
+		if (adev->asic_type == CHIP_SIENNA_CICHLID)
+			ret = smu_system_features_control(smu, true);
+		return ret;
 	}
 
 	ret = smu_init_display_count(smu, 0);
-- 
2.17.1