[PATCH 4/8] drm/amdgpu/swSMU: correct the bootup power source for Navi1X

[Alex Deucher]

From: Evan Quan <evan.quan at amd.com>

PMFW may boots those ASICs with DC mode. Need to set it back
to AC mode.

Signed-off-by: Evan Quan <evan.quan at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/powerplay/amdgpu_smu.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
index f6d4b0ef46ad..2cfb911ab370 100644
--- a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
@@ -1154,6 +1154,21 @@ static int smu_smc_table_hw_init(struct smu_context *smu,
 				}
 			}
 		}
+
+		if (adev->asic_type >= CHIP_NAVI10 &&
+		    adev->asic_type <= CHIP_NAVI12) {
+			/*
+			 * For Navi1X, manually switch it to AC mode as PMFW
+			 * may boot it with DC mode.
+			 * TODO: should check whether we are indeed under AC
+			 * mode before doing this.
+			 */
+			ret = smu_set_power_source(smu, SMU_POWER_SOURCE_AC);
+			if (ret) {
+				pr_err("Failed to switch to AC mode!\n");
+				return ret;
+			}
+		}
 	}
 	if (adev->asic_type != CHIP_ARCTURUS) {
 		ret = smu_notify_display_change(smu);
-- 
2.25.1