drm/amd/pm: Add debug prints

Add prints where there are none and none are printed in the callee.

Remove the word "previous" from comment and print to make it shorter and
avoid confusion in various prints.

Cc: Alex Deucher <Alexander.Deucher@amd.com>
Signed-off-by: Luben Tuikov <luben.tuikov@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/amdgpu_smu.c

@@ -1153,6 +1153,8 @@ static int smu_smc_hw_setup(struct smu_context *smu)
 		case IP_VERSION(11, 5, 0):
 		case IP_VERSION(11, 0, 12):
 			ret = smu_system_features_control(smu, true);
+			if (ret)
+				dev_err(adev->dev, "Failed system features control!\n");
 			break;
 		default:
 			break;
@@ -1277,8 +1279,10 @@ static int smu_smc_hw_setup(struct smu_context *smu)
 	}
 
 	ret = smu_notify_display_change(smu);
-	if (ret)
+	if (ret) {
+		dev_err(adev->dev, "Failed to notify display change!\n");
 		return ret;
+	}
 
 	/*
 	 * Set min deep sleep dce fclk with bootup value from vbios via
@@ -1286,8 +1290,6 @@ static int smu_smc_hw_setup(struct smu_context *smu)
 	 */
 	ret = smu_set_min_dcef_deep_sleep(smu,
 					  smu->smu_table.boot_values.dcefclk / 100);
-	if (ret)
-		return ret;
 
 	return ret;
 }

drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c

@@ -97,7 +97,7 @@ static void smu_cmn_read_arg(struct smu_context *smu,
  * smu: a pointer to SMU context
  *
  * Returns the status of the SMU, which could be,
- *    0, the SMU is busy with your previous command;
+ *    0, the SMU is busy with your command;
  *    1, execution status: success, execution result: success;
  * 0xFF, execution status: success, execution result: failure;
  * 0xFE, unknown command;
@@ -143,7 +143,7 @@ static void __smu_cmn_reg_print_error(struct smu_context *smu,
 		u32 msg_idx = RREG32_SOC15(MP1, 0, mmMP1_SMN_C2PMSG_66);
 		u32 prm     = RREG32_SOC15(MP1, 0, mmMP1_SMN_C2PMSG_82);
 		dev_err_ratelimited(adev->dev,
-				    "SMU: I'm not done with your previous command: SMN_C2PMSG_66:0x%08X SMN_C2PMSG_82:0x%08X",
+				    "SMU: I'm not done with your command: SMN_C2PMSG_66:0x%08X SMN_C2PMSG_82:0x%08X",
 				    msg_idx, prm);
 	}
 		break;