drm/radeon/dpm: implement force performance level for SI

Allows you to force the selected performance level via sysfs.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_asic.c

@@ -2287,6 +2287,7 @@ static struct radeon_asic si_asic = {
 		.get_mclk = &ni_dpm_get_mclk,
 		.print_power_state = &ni_dpm_print_power_state,
 		.debugfs_print_current_performance_level = &si_dpm_debugfs_print_current_performance_level,
+		.force_performance_level = &si_dpm_force_performance_level,
 	},
 	.pflip = {
 		.pre_page_flip = &evergreen_pre_page_flip,

drivers/gpu/drm/radeon/radeon_asic.h

@@ -683,6 +683,8 @@ void si_dpm_fini(struct radeon_device *rdev);
 void si_dpm_display_configuration_changed(struct radeon_device *rdev);
 void si_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
 						    struct seq_file *m);
+int si_dpm_force_performance_level(struct radeon_device *rdev,
+				   enum radeon_dpm_forced_level level);
 
 /* DCE8 - CIK */
 void dce8_bandwidth_update(struct radeon_device *rdev);

drivers/gpu/drm/radeon/si_dpm.c

@@ -3231,16 +3231,38 @@ static int si_restrict_performance_levels_before_switch(struct radeon_device *rd
 		0 : -EINVAL;
 }
 
-#if 0
-static int si_unrestrict_performance_levels_after_switch(struct radeon_device *rdev)
+int si_dpm_force_performance_level(struct radeon_device *rdev,
+				   enum radeon_dpm_forced_level level)
 {
+	struct radeon_ps *rps = rdev->pm.dpm.current_ps;
+	struct ni_ps *ps = ni_get_ps(rps);
+	u32 levels;
+
+	if (level == RADEON_DPM_FORCED_LEVEL_HIGH) {
+		if (si_send_msg_to_smc_with_parameter(rdev, PPSMC_MSG_SetEnabledLevels, 0) != PPSMC_Result_OK)
+			return -EINVAL;
+
+		if (si_send_msg_to_smc_with_parameter(rdev, PPSMC_MSG_SetForcedLevels, 1) != PPSMC_Result_OK)
+			return -EINVAL;
+	} else if (level == RADEON_DPM_FORCED_LEVEL_LOW) {
 		if (si_send_msg_to_smc_with_parameter(rdev, PPSMC_MSG_SetForcedLevels, 0) != PPSMC_Result_OK)
 			return -EINVAL;
 
-	return (si_send_msg_to_smc_with_parameter(rdev, PPSMC_MSG_SetEnabledLevels, 0) == PPSMC_Result_OK) ?
-		0 : -EINVAL;
+		levels = ps->performance_level_count - 1;
+		if (si_send_msg_to_smc_with_parameter(rdev, PPSMC_MSG_SetEnabledLevels, levels) != PPSMC_Result_OK)
+			return -EINVAL;
+	} else if (level == RADEON_DPM_FORCED_LEVEL_AUTO) {
+		if (si_send_msg_to_smc_with_parameter(rdev, PPSMC_MSG_SetForcedLevels, 0) != PPSMC_Result_OK)
+			return -EINVAL;
+
+		if (si_send_msg_to_smc_with_parameter(rdev, PPSMC_MSG_SetEnabledLevels, 0) != PPSMC_Result_OK)
+			return -EINVAL;
+	}
+
+	rdev->pm.dpm.forced_level = level;
+
+	return 0;
 }
-#endif
 
 static int si_set_boot_state(struct radeon_device *rdev)
 {
@@ -5992,11 +6014,13 @@ int si_dpm_set_power_state(struct radeon_device *rdev)
 
 #if 0
 	/* XXX */
-	ret = si_unrestrict_performance_levels_after_switch(rdev);
+	ret = si_dpm_force_performance_level(rdev, RADEON_DPM_FORCED_LEVEL_AUTO);
 	if (ret) {
-		DRM_ERROR("si_unrestrict_performance_levels_after_switch failed\n");
+		DRM_ERROR("si_dpm_force_performance_level failed\n");
 		return ret;
 	}
+#else
+	rdev->pm.dpm.forced_level = RADEON_DPM_FORCED_LEVEL_AUTO;
 #endif
 
 	return 0;