drm/radeon/dpm: add new pre/post_set_power_state callbacks

Needed to properly handle dynamic state adjustment.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon.h

@@ -1615,7 +1615,9 @@ struct radeon_asic {
 		void (*setup_asic)(struct radeon_device *rdev);
 		int (*enable)(struct radeon_device *rdev);
 		void (*disable)(struct radeon_device *rdev);
+		int (*pre_set_power_state)(struct radeon_device *rdev);
 		int (*set_power_state)(struct radeon_device *rdev);
+		void (*post_set_power_state)(struct radeon_device *rdev);
 		void (*display_configuration_changed)(struct radeon_device *rdev);
 		void (*fini)(struct radeon_device *rdev);
 		u32 (*get_sclk)(struct radeon_device *rdev, bool low);
@@ -2328,7 +2330,9 @@ void radeon_ring_write(struct radeon_ring *ring, uint32_t v);
 #define radeon_dpm_setup_asic(rdev) rdev->asic->dpm.setup_asic((rdev))
 #define radeon_dpm_enable(rdev) rdev->asic->dpm.enable((rdev))
 #define radeon_dpm_disable(rdev) rdev->asic->dpm.disable((rdev))
+#define radeon_dpm_pre_set_power_state(rdev) rdev->asic->dpm.pre_set_power_state((rdev))
 #define radeon_dpm_set_power_state(rdev) rdev->asic->dpm.set_power_state((rdev))
+#define radeon_dpm_post_set_power_state(rdev) rdev->asic->dpm.post_set_power_state((rdev))
 #define radeon_dpm_display_configuration_changed(rdev) rdev->asic->dpm.display_configuration_changed((rdev))
 #define radeon_dpm_fini(rdev) rdev->asic->dpm.fini((rdev))
 #define radeon_dpm_get_sclk(rdev, l) rdev->asic->dpm.get_sclk((rdev), (l))

drivers/gpu/drm/radeon/radeon_pm.c

@@ -700,6 +700,7 @@ static void radeon_dpm_change_power_state_locked(struct radeon_device *rdev)
 	int i;
 	struct radeon_ps *ps;
 	enum radeon_pm_state_type dpm_state;
+	int ret;
 
 	/* if dpm init failed */
 	if (!rdev->pm.dpm_enabled)
@@ -766,6 +767,12 @@ static void radeon_dpm_change_power_state_locked(struct radeon_device *rdev)
 	down_write(&rdev->pm.mclk_lock);
 	mutex_lock(&rdev->ring_lock);
 
+	if (rdev->asic->dpm.pre_set_power_state) {
+		ret = radeon_dpm_pre_set_power_state(rdev);
+		if (ret)
+			goto done;
+	}
+
 	/* update display watermarks based on new power state */
 	radeon_bandwidth_update(rdev);
 	/* update displays */
@@ -787,6 +794,10 @@ static void radeon_dpm_change_power_state_locked(struct radeon_device *rdev)
 	/* update current power state */
 	rdev->pm.dpm.current_ps = rdev->pm.dpm.requested_ps;
 
+	if (rdev->asic->dpm.post_set_power_state)
+		radeon_dpm_post_set_power_state(rdev);
+
+done:
 	mutex_unlock(&rdev->ring_lock);
 	up_write(&rdev->pm.mclk_lock);
 	mutex_unlock(&rdev->ddev->struct_mutex);