drm/radeon: bind fan control on SI cards to hwmon interface

This adds a possibility to control fan on SI parts
via exported hwmon variables. Note that automatic
ucode fan management pauses if you choose to enable
manual fan control.  Use with caution!
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_asic.c

@@ -1953,6 +1953,10 @@ static struct radeon_asic si_asic = {
 		.debugfs_print_current_performance_level = &si_dpm_debugfs_print_current_performance_level,
 		.force_performance_level = &si_dpm_force_performance_level,
 		.vblank_too_short = &ni_dpm_vblank_too_short,
+		.fan_ctrl_set_mode = &si_fan_ctrl_set_mode,
+		.fan_ctrl_get_mode = &si_fan_ctrl_get_mode,
+		.get_fan_speed_percent = &si_fan_ctrl_get_fan_speed_percent,
+		.set_fan_speed_percent = &si_fan_ctrl_set_fan_speed_percent,
 	},
 	.pflip = {
 		.page_flip = &evergreen_page_flip,

drivers/gpu/drm/radeon/radeon_asic.h

@@ -744,6 +744,12 @@ 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);
+int si_fan_ctrl_get_fan_speed_percent(struct radeon_device *rdev,
+						 u32 *speed);
+int si_fan_ctrl_set_fan_speed_percent(struct radeon_device *rdev,
+						 u32 speed);
+u32 si_fan_ctrl_get_mode(struct radeon_device *rdev);
+void si_fan_ctrl_set_mode(struct radeon_device *rdev, u32 mode);
 
 /* DCE8 - CIK */
 void dce8_bandwidth_update(struct radeon_device *rdev);

drivers/gpu/drm/radeon/si_dpm.c

@@ -1756,6 +1756,9 @@ static int si_calculate_sclk_params(struct radeon_device *rdev,
 				    u32 engine_clock,
 				    SISLANDS_SMC_SCLK_VALUE *sclk);
 
+static void si_thermal_start_smc_fan_control(struct radeon_device *rdev);
+static void si_fan_ctrl_set_default_mode(struct radeon_device *rdev);
+
 static struct si_power_info *si_get_pi(struct radeon_device *rdev)
 {
         struct si_power_info *pi = rdev->pm.dpm.priv;
@@ -6012,36 +6015,46 @@ static int si_thermal_setup_fan_table(struct radeon_device *rdev)
 
 static int si_fan_ctrl_start_smc_fan_control(struct radeon_device *rdev)
 {
+	struct si_power_info *si_pi = si_get_pi(rdev);
 	PPSMC_Result ret;
 
 	ret = si_send_msg_to_smc(rdev, PPSMC_StartFanControl);
-	if (ret == PPSMC_Result_OK)
+	if (ret == PPSMC_Result_OK) {
+		si_pi->fan_is_controlled_by_smc = true;
 		return 0;
-	else
+	} else {
 		return -EINVAL;
+	}
 }
 
 static int si_fan_ctrl_stop_smc_fan_control(struct radeon_device *rdev)
 {
+	struct si_power_info *si_pi = si_get_pi(rdev);
 	PPSMC_Result ret;
 
 	ret = si_send_msg_to_smc(rdev, PPSMC_StopFanControl);
-	if (ret == PPSMC_Result_OK)
+
+	if (ret == PPSMC_Result_OK) {
+		si_pi->fan_is_controlled_by_smc = false;
 		return 0;
-	else
+	} else {
 		return -EINVAL;
+	}
 }
 
-#if 0
-static int si_fan_ctrl_get_fan_speed_percent(struct radeon_device *rdev,
-					     u32 *speed)
+int si_fan_ctrl_get_fan_speed_percent(struct radeon_device *rdev,
+				      u32 *speed)
 {
+	struct si_power_info *si_pi = si_get_pi(rdev);
 	u32 duty, duty100;
 	u64 tmp64;
 
 	if (rdev->pm.no_fan)
 		return -ENOENT;
 
+	if (si_pi->fan_is_controlled_by_smc)
+ 		return -EINVAL;
+
 	duty100 = (RREG32(CG_FDO_CTRL1) & FMAX_DUTY100_MASK) >> FMAX_DUTY100_SHIFT;
 	duty = (RREG32(CG_THERMAL_STATUS) & FDO_PWM_DUTY_MASK) >> FDO_PWM_DUTY_SHIFT;
 
@@ -6058,8 +6071,8 @@ static int si_fan_ctrl_get_fan_speed_percent(struct radeon_device *rdev,
 	return 0;
 }
 
-static int si_fan_ctrl_set_fan_speed_percent(struct radeon_device *rdev,
-					     u32 speed)
+int si_fan_ctrl_set_fan_speed_percent(struct radeon_device *rdev,
+				      u32 speed)
 {
 	u32 tmp;
 	u32 duty, duty100;
@@ -6071,9 +6084,6 @@ static int si_fan_ctrl_set_fan_speed_percent(struct radeon_device *rdev,
 	if (speed > 100)
 		return -EINVAL;
 
-	if (rdev->pm.dpm.fan.ucode_fan_control)
-		si_fan_ctrl_stop_smc_fan_control(rdev);
-
 	duty100 = (RREG32(CG_FDO_CTRL1) & FMAX_DUTY100_MASK) >> FMAX_DUTY100_SHIFT;
 
 	if (duty100 == 0)
@@ -6087,11 +6097,38 @@ static int si_fan_ctrl_set_fan_speed_percent(struct radeon_device *rdev,
 	tmp |= FDO_STATIC_DUTY(duty);
 	WREG32(CG_FDO_CTRL0, tmp);
 
-	si_fan_ctrl_set_static_mode(rdev, FDO_PWM_MODE_STATIC);
-
 	return 0;
 }
 
+void si_fan_ctrl_set_mode(struct radeon_device *rdev, u32 mode)
+{
+	if (mode) {
+		/* stop auto-manage */
+		if (rdev->pm.dpm.fan.ucode_fan_control)
+			si_fan_ctrl_stop_smc_fan_control(rdev);
+		si_fan_ctrl_set_static_mode(rdev, mode);
+	} else {
+		/* restart auto-manage */
+		if (rdev->pm.dpm.fan.ucode_fan_control)
+			si_thermal_start_smc_fan_control(rdev);
+		else
+			si_fan_ctrl_set_default_mode(rdev);
+	}
+}
+
+u32 si_fan_ctrl_get_mode(struct radeon_device *rdev)
+{
+	struct si_power_info *si_pi = si_get_pi(rdev);
+	u32 tmp;
+
+	if (si_pi->fan_is_controlled_by_smc)
+		return 0;
+
+	tmp = RREG32(CG_FDO_CTRL2) & FDO_PWM_MODE_MASK;
+	return (tmp >> FDO_PWM_MODE_SHIFT);
+}
+
+#if 0
 static int si_fan_ctrl_get_fan_speed_rpm(struct radeon_device *rdev,
 					 u32 *speed)
 {

drivers/gpu/drm/radeon/si_dpm.h

@@ -202,6 +202,7 @@ struct si_power_info {
 	bool fan_ctrl_is_in_default_mode;
 	u32 t_min;
 	u32 fan_ctrl_default_mode;
+	bool fan_is_controlled_by_smc;
 };
 
 #define SISLANDS_INITIAL_STATE_ARB_INDEX    0