drm/radeon/dpm: implement force performance levels for 7xx/eg/btc

Allows you to limit the selected power levels via sysfs.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/btc_dpm.c

@@ -2326,9 +2326,9 @@ int btc_dpm_set_power_state(struct radeon_device *rdev)
 		return ret;
 	}
 
-	ret = rv770_unrestrict_performance_levels_after_switch(rdev);
+	ret = rv770_dpm_force_performance_level(rdev, RADEON_DPM_FORCED_LEVEL_AUTO);
 	if (ret) {
-		DRM_ERROR("rv770_unrestrict_performance_levels_after_switch failed\n");
+		DRM_ERROR("rv770_dpm_force_performance_level failed\n");
 		return ret;
 	}
 

drivers/gpu/drm/radeon/cypress_dpm.c

@@ -2014,9 +2014,9 @@ int cypress_dpm_set_power_state(struct radeon_device *rdev)
 	if (eg_pi->pcie_performance_request)
 		cypress_notify_link_speed_change_after_state_change(rdev, new_ps, old_ps);
 
-	ret = rv770_unrestrict_performance_levels_after_switch(rdev);
+	ret = rv770_dpm_force_performance_level(rdev, RADEON_DPM_FORCED_LEVEL_AUTO);
 	if (ret) {
-		DRM_ERROR("rv770_unrestrict_performance_levels_after_switch failed\n");
+		DRM_ERROR("rv770_dpm_force_performance_level failed\n");
 		return ret;
 	}
 

drivers/gpu/drm/radeon/ppsmc.h

@@ -71,6 +71,8 @@ typedef uint8_t PPSMC_Result;
 #define PPSMC_MSG_SwitchToSwState           ((uint8_t)0x20)
 #define PPSMC_MSG_SwitchToInitialState      ((uint8_t)0x40)
 #define PPSMC_MSG_NoForcedLevel             ((uint8_t)0x41)
+#define PPSMC_MSG_ForceHigh                 ((uint8_t)0x42)
+#define PPSMC_MSG_ForceMediumOrHigh         ((uint8_t)0x43)
 #define PPSMC_MSG_SwitchToMinimumPower      ((uint8_t)0x51)
 #define PPSMC_MSG_ResumeFromMinimumPower    ((uint8_t)0x52)
 #define PPSMC_MSG_EnableCac                 ((uint8_t)0x53)

drivers/gpu/drm/radeon/radeon_asic.c

@@ -1393,6 +1393,7 @@ static struct radeon_asic rv770_asic = {
 		.get_mclk = &rv770_dpm_get_mclk,
 		.print_power_state = &rv770_dpm_print_power_state,
 		.debugfs_print_current_performance_level = &rv770_dpm_debugfs_print_current_performance_level,
+		.force_performance_level = &rv770_dpm_force_performance_level,
 	},
 	.pflip = {
 		.pre_page_flip = &rs600_pre_page_flip,
@@ -1516,6 +1517,7 @@ static struct radeon_asic evergreen_asic = {
 		.get_mclk = &rv770_dpm_get_mclk,
 		.print_power_state = &rv770_dpm_print_power_state,
 		.debugfs_print_current_performance_level = &rv770_dpm_debugfs_print_current_performance_level,
+		.force_performance_level = &rv770_dpm_force_performance_level,
 	},
 	.pflip = {
 		.pre_page_flip = &evergreen_pre_page_flip,
@@ -1762,6 +1764,7 @@ static struct radeon_asic btc_asic = {
 		.get_mclk = &btc_dpm_get_mclk,
 		.print_power_state = &rv770_dpm_print_power_state,
 		.debugfs_print_current_performance_level = &rv770_dpm_debugfs_print_current_performance_level,
+		.force_performance_level = &rv770_dpm_force_performance_level,
 	},
 	.pflip = {
 		.pre_page_flip = &evergreen_pre_page_flip,

drivers/gpu/drm/radeon/radeon_asic.h

@@ -478,6 +478,8 @@ void rv770_dpm_print_power_state(struct radeon_device *rdev,
 				 struct radeon_ps *ps);
 void rv770_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
 						       struct seq_file *m);
+int rv770_dpm_force_performance_level(struct radeon_device *rdev,
+				      enum radeon_dpm_forced_level level);
 
 /*
  * evergreen

drivers/gpu/drm/radeon/rv770_dpm.c

@@ -1471,14 +1471,30 @@ int rv770_restrict_performance_levels_before_switch(struct radeon_device *rdev)
 	return 0;
 }
 
-int rv770_unrestrict_performance_levels_after_switch(struct radeon_device *rdev)
-{
-	if (rv770_send_msg_to_smc(rdev, (PPSMC_Msg)(PPSMC_MSG_NoForcedLevel)) != PPSMC_Result_OK)
-		return -EINVAL;
+int rv770_dpm_force_performance_level(struct radeon_device *rdev,
+				      enum radeon_dpm_forced_level level)
+{
+	PPSMC_Msg msg;
+
+	if (level == RADEON_DPM_FORCED_LEVEL_HIGH) {
+		if (rv770_send_msg_to_smc(rdev, PPSMC_MSG_ZeroLevelsDisabled) != PPSMC_Result_OK)
+			return -EINVAL;
+		msg = PPSMC_MSG_ForceHigh;
+	} else if (level == RADEON_DPM_FORCED_LEVEL_LOW) {
+		if (rv770_send_msg_to_smc(rdev, PPSMC_MSG_NoForcedLevel) != PPSMC_Result_OK)
+			return -EINVAL;
+		msg = (PPSMC_Msg)(PPSMC_MSG_TwoLevelsDisabled);
+	} else {
+		if (rv770_send_msg_to_smc(rdev, PPSMC_MSG_NoForcedLevel) != PPSMC_Result_OK)
+			return -EINVAL;
+		msg = (PPSMC_Msg)(PPSMC_MSG_ZeroLevelsDisabled);
+	}
 
-	if (rv770_send_msg_to_smc(rdev, (PPSMC_Msg)(PPSMC_MSG_ZeroLevelsDisabled)) != PPSMC_Result_OK)
+	if (rv770_send_msg_to_smc(rdev, msg) != PPSMC_Result_OK)
 		return -EINVAL;
 
+	rdev->pm.dpm.forced_level = level;
+
 	return 0;
 }
 
@@ -2047,9 +2063,10 @@ int rv770_dpm_set_power_state(struct radeon_device *rdev)
 	if (pi->dcodt)
 		rv770_program_dcodt_after_state_switch(rdev, new_ps, old_ps);
 	rv770_set_uvd_clock_after_set_eng_clock(rdev, new_ps, old_ps);
-	ret = rv770_unrestrict_performance_levels_after_switch(rdev);
+
+	ret = rv770_dpm_force_performance_level(rdev, RADEON_DPM_FORCED_LEVEL_AUTO);
 	if (ret) {
-		DRM_ERROR("rv770_unrestrict_performance_levels_after_switch failed\n");
+		DRM_ERROR("rv770_dpm_force_performance_level failed\n");
 		return ret;
 	}
 

drivers/gpu/drm/radeon/rv770_dpm.h

@@ -262,7 +262,8 @@ void rv770_stop_dpm(struct radeon_device *rdev);
 void r7xx_stop_smc(struct radeon_device *rdev);
 void rv770_reset_smio_status(struct radeon_device *rdev);
 int rv770_restrict_performance_levels_before_switch(struct radeon_device *rdev);
-int rv770_unrestrict_performance_levels_after_switch(struct radeon_device *rdev);
+int rv770_dpm_force_performance_level(struct radeon_device *rdev,
+				      enum radeon_dpm_forced_level level);
 int rv770_halt_smc(struct radeon_device *rdev);
 int rv770_resume_smc(struct radeon_device *rdev);
 int rv770_set_sw_state(struct radeon_device *rdev);