drm/radeon: bind fan control on CI cards to hwmon interface (v2)

This adds a possibility to control fan on CI parts
via exported hwmon variables. Note that automatic
ucode fan management pauses if you choose to enable
manual fan control.  Use with caution!

v2: agd5f: fix formatting, squash in:

    minor fix for pwm1_enable exposed value

    Track smc control in addition to fan mode
    This fixes pwm1_enable being constantly set
    to 1 because of enabled smc control

also handle the case where smc fan control is disabled.
Signed-off-by: Oleg Chernovskiy <algonkvel@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/ci_dpm.c

@@ -187,6 +187,9 @@ static int ci_update_uvd_dpm(struct radeon_device *rdev, bool gate);
 static PPSMC_Result ci_send_msg_to_smc_with_parameter(struct radeon_device *rdev,
 						      PPSMC_Msg msg, u32 parameter);
 
+static void ci_thermal_start_smc_fan_control(struct radeon_device *rdev);
+static void ci_fan_ctrl_set_default_mode(struct radeon_device *rdev);
+
 static struct ci_power_info *ci_get_pi(struct radeon_device *rdev)
 {
         struct ci_power_info *pi = rdev->pm.dpm.priv;
@@ -1043,22 +1046,24 @@ static int ci_fan_ctrl_start_smc_fan_control(struct radeon_device *rdev)
 			return -EINVAL;
 	}
 
+	pi->fan_is_controlled_by_smc = true;
 	return 0;
 }
 
-#if 0
 static int ci_fan_ctrl_stop_smc_fan_control(struct radeon_device *rdev)
 {
 	PPSMC_Result ret;
+	struct ci_power_info *pi = ci_get_pi(rdev);
 
 	ret = ci_send_msg_to_smc(rdev, PPSMC_StopFanControl);
-	if (ret == PPSMC_Result_OK)
+	if (ret == PPSMC_Result_OK) {
+		pi->fan_is_controlled_by_smc = false;
 		return 0;
-	else
+	} else
 		return -EINVAL;
 }
 
-static int ci_fan_ctrl_get_fan_speed_percent(struct radeon_device *rdev,
+int ci_fan_ctrl_get_fan_speed_percent(struct radeon_device *rdev,
 					     u32 *speed)
 {
 	u32 duty, duty100;
@@ -1083,21 +1088,22 @@ static int ci_fan_ctrl_get_fan_speed_percent(struct radeon_device *rdev,
 	return 0;
 }
 
-static int ci_fan_ctrl_set_fan_speed_percent(struct radeon_device *rdev,
+int ci_fan_ctrl_set_fan_speed_percent(struct radeon_device *rdev,
 					     u32 speed)
 {
 	u32 tmp;
 	u32 duty, duty100;
 	u64 tmp64;
+	struct ci_power_info *pi = ci_get_pi(rdev);
 
 	if (rdev->pm.no_fan)
 		return -ENOENT;
 
-	if (speed > 100)
+	if (pi->fan_is_controlled_by_smc)
 		return -EINVAL;
 
-	if (rdev->pm.dpm.fan.ucode_fan_control)
-		ci_fan_ctrl_stop_smc_fan_control(rdev);
+	if (speed > 100)
+		return -EINVAL;
 
 	duty100 = (RREG32_SMC(CG_FDO_CTRL1) & FMAX_DUTY100_MASK) >> FMAX_DUTY100_SHIFT;
 
@@ -1112,11 +1118,38 @@ static int ci_fan_ctrl_set_fan_speed_percent(struct radeon_device *rdev,
 	tmp |= FDO_STATIC_DUTY(duty);
 	WREG32_SMC(CG_FDO_CTRL0, tmp);
 
-	ci_fan_ctrl_set_static_mode(rdev, FDO_PWM_MODE_STATIC);
-
 	return 0;
 }
 
+void ci_fan_ctrl_set_mode(struct radeon_device *rdev, u32 mode)
+{
+	if (mode) {
+		/* stop auto-manage */
+		if (rdev->pm.dpm.fan.ucode_fan_control)
+			ci_fan_ctrl_stop_smc_fan_control(rdev);
+		ci_fan_ctrl_set_static_mode(rdev, mode);
+	} else {
+		/* restart auto-manage */
+		if (rdev->pm.dpm.fan.ucode_fan_control)
+			ci_thermal_start_smc_fan_control(rdev);
+		else
+			ci_fan_ctrl_set_default_mode(rdev);
+	}
+}
+
+u32 ci_fan_ctrl_get_mode(struct radeon_device *rdev)
+{
+	struct ci_power_info *pi = ci_get_pi(rdev);
+	u32 tmp;
+
+	if (pi->fan_is_controlled_by_smc)
+		return 0;
+
+	tmp = RREG32_SMC(CG_FDO_CTRL2) & FDO_PWM_MODE_MASK;
+	return (tmp >> FDO_PWM_MODE_SHIFT);
+}
+
+#if 0
 static int ci_fan_ctrl_get_fan_speed_rpm(struct radeon_device *rdev,
 					 u32 *speed)
 {

drivers/gpu/drm/radeon/ci_dpm.h

@@ -291,6 +291,7 @@ struct ci_power_info {
 	struct ci_ps requested_ps;
 	/* fan control */
 	bool fan_ctrl_is_in_default_mode;
+	bool fan_is_controlled_by_smc;
 	u32 t_min;
 	u32 fan_ctrl_default_mode;
 };

drivers/gpu/drm/radeon/radeon_asic.c

@@ -2118,6 +2118,10 @@ static struct radeon_asic ci_asic = {
 		.force_performance_level = &ci_dpm_force_performance_level,
 		.vblank_too_short = &ci_dpm_vblank_too_short,
 		.powergate_uvd = &ci_dpm_powergate_uvd,
+		.fan_ctrl_set_mode = &ci_fan_ctrl_set_mode,
+		.fan_ctrl_get_mode = &ci_fan_ctrl_get_mode,
+		.get_fan_speed_percent = &ci_fan_ctrl_get_fan_speed_percent,
+		.set_fan_speed_percent = &ci_fan_ctrl_set_fan_speed_percent,
 	},
 	.pflip = {
 		.page_flip = &evergreen_page_flip,

drivers/gpu/drm/radeon/radeon_asic.h

@@ -861,6 +861,13 @@ int ci_dpm_force_performance_level(struct radeon_device *rdev,
 bool ci_dpm_vblank_too_short(struct radeon_device *rdev);
 void ci_dpm_powergate_uvd(struct radeon_device *rdev, bool gate);
 
+int ci_fan_ctrl_get_fan_speed_percent(struct radeon_device *rdev,
+						 u32 *speed);
+int ci_fan_ctrl_set_fan_speed_percent(struct radeon_device *rdev,
+						 u32 speed);
+u32 ci_fan_ctrl_get_mode(struct radeon_device *rdev);
+void ci_fan_ctrl_set_mode(struct radeon_device *rdev, u32 mode);
+
 int kv_dpm_init(struct radeon_device *rdev);
 int kv_dpm_enable(struct radeon_device *rdev);
 int kv_dpm_late_enable(struct radeon_device *rdev);