drm/radeon/dpm: add pre/post_set_power_state callback (TN)

This properly implemented dynamic state adjustment by
using a working copy of the requested and current
power states.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_asic.c

@@ -2091,7 +2091,9 @@ static struct radeon_asic trinity_asic = {
 		.setup_asic = &trinity_dpm_setup_asic,
 		.enable = &trinity_dpm_enable,
 		.disable = &trinity_dpm_disable,
+		.pre_set_power_state = &trinity_dpm_pre_set_power_state,
 		.set_power_state = &trinity_dpm_set_power_state,
+		.post_set_power_state = &trinity_dpm_post_set_power_state,
 		.display_configuration_changed = &trinity_dpm_display_configuration_changed,
 		.fini = &trinity_dpm_fini,
 		.get_sclk = &trinity_dpm_get_sclk,

drivers/gpu/drm/radeon/radeon_asic.h

@@ -604,7 +604,9 @@ void ni_dpm_print_power_state(struct radeon_device *rdev,
 int trinity_dpm_init(struct radeon_device *rdev);
 int trinity_dpm_enable(struct radeon_device *rdev);
 void trinity_dpm_disable(struct radeon_device *rdev);
+int trinity_dpm_pre_set_power_state(struct radeon_device *rdev);
 int trinity_dpm_set_power_state(struct radeon_device *rdev);
+void trinity_dpm_post_set_power_state(struct radeon_device *rdev);
 void trinity_dpm_setup_asic(struct radeon_device *rdev);
 void trinity_dpm_display_configuration_changed(struct radeon_device *rdev);
 void trinity_dpm_fini(struct radeon_device *rdev);

drivers/gpu/drm/radeon/trinity_dpm.c

@@ -832,15 +832,6 @@ static void trinity_unforce_levels(struct radeon_device *rdev)
 	trinity_dpm_no_forced_level(rdev);
 }
 
-static void trinity_update_current_power_levels(struct radeon_device *rdev,
-						struct radeon_ps *rps)
-{
-	struct trinity_ps *new_ps = trinity_get_ps(rps);
-	struct trinity_power_info *pi = trinity_get_pi(rdev);
-
-	pi->current_ps = *new_ps;
-}
-
 static void trinity_program_power_levels_0_to_n(struct radeon_device *rdev,
 						struct radeon_ps *new_rps,
 						struct radeon_ps *old_rps)
@@ -1046,6 +1037,28 @@ static int trinity_set_thermal_temperature_range(struct radeon_device *rdev,
 	return 0;
 }
 
+static void trinity_update_current_ps(struct radeon_device *rdev,
+				      struct radeon_ps *rps)
+{
+	struct trinity_ps *new_ps = trinity_get_ps(rps);
+	struct trinity_power_info *pi = trinity_get_pi(rdev);
+
+	pi->current_rps = *rps;
+	pi->current_ps = *new_ps;
+	pi->current_rps.ps_priv = &pi->current_ps;
+}
+
+static void trinity_update_requested_ps(struct radeon_device *rdev,
+					struct radeon_ps *rps)
+{
+	struct trinity_ps *new_ps = trinity_get_ps(rps);
+	struct trinity_power_info *pi = trinity_get_pi(rdev);
+
+	pi->requested_rps = *rps;
+	pi->requested_ps = *new_ps;
+	pi->requested_rps.ps_priv = &pi->requested_ps;
+}
+
 int trinity_dpm_enable(struct radeon_device *rdev)
 {
 	struct trinity_power_info *pi = trinity_get_pi(rdev);
@@ -1077,6 +1090,8 @@ int trinity_dpm_enable(struct radeon_device *rdev)
 		radeon_irq_set(rdev);
 	}
 
+	trinity_update_current_ps(rdev, rdev->pm.dpm.boot_ps);
+
 	return 0;
 }
 
@@ -1099,6 +1114,8 @@ void trinity_dpm_disable(struct radeon_device *rdev)
 		rdev->irq.dpm_thermal = false;
 		radeon_irq_set(rdev);
 	}
+
+	trinity_update_current_ps(rdev, rdev->pm.dpm.boot_ps);
 }
 
 static void trinity_get_min_sclk_divider(struct radeon_device *rdev)
@@ -1127,14 +1144,26 @@ static void trinity_setup_nbp_sim(struct radeon_device *rdev,
 	}
 }
 
-int trinity_dpm_set_power_state(struct radeon_device *rdev)
+int trinity_dpm_pre_set_power_state(struct radeon_device *rdev)
 {
 	struct trinity_power_info *pi = trinity_get_pi(rdev);
-	struct radeon_ps *new_ps = rdev->pm.dpm.requested_ps;
-	struct radeon_ps *old_ps = rdev->pm.dpm.current_ps;
+	struct radeon_ps requested_ps = *rdev->pm.dpm.requested_ps;
+	struct radeon_ps *new_ps = &requested_ps;
+
+	trinity_update_requested_ps(rdev, new_ps);
+
+	trinity_apply_state_adjust_rules(rdev,
+					 &pi->requested_rps,
+					 &pi->current_rps);
+
+	return 0;
+}
 
-	trinity_apply_state_adjust_rules(rdev, new_ps, old_ps);
-	trinity_update_current_power_levels(rdev, new_ps);
+int trinity_dpm_set_power_state(struct radeon_device *rdev)
+{
+	struct trinity_power_info *pi = trinity_get_pi(rdev);
+	struct radeon_ps *new_ps = &pi->requested_rps;
+	struct radeon_ps *old_ps = &pi->current_rps;
 
 	trinity_acquire_mutex(rdev);
 	if (pi->enable_dpm) {
@@ -1153,6 +1182,14 @@ int trinity_dpm_set_power_state(struct radeon_device *rdev)
 	return 0;
 }
 
+void trinity_dpm_post_set_power_state(struct radeon_device *rdev)
+{
+	struct trinity_power_info *pi = trinity_get_pi(rdev);
+	struct radeon_ps *new_ps = &pi->requested_rps;
+
+	trinity_update_current_ps(rdev, new_ps);
+}
+
 void trinity_dpm_setup_asic(struct radeon_device *rdev)
 {
 	trinity_acquire_mutex(rdev);
@@ -1390,11 +1427,6 @@ static void trinity_apply_state_adjust_rules(struct radeon_device *rdev,
 	bool force_high;
 	u32 num_active_displays = rdev->pm.dpm.new_active_crtc_count;
 
-	/* point to the hw copy since this function will modify the ps */
-	pi->hw_ps = *ps;
-	rdev->pm.dpm.hw_ps.ps_priv = &pi->hw_ps;
-	ps = &pi->hw_ps;
-
 	if (new_rps->class & ATOM_PPLIB_CLASSIFICATION_THERMAL)
 		return trinity_patch_thermal_state(rdev, ps, current_ps);
 
@@ -1833,7 +1865,8 @@ void trinity_dpm_fini(struct radeon_device *rdev)
 
 u32 trinity_dpm_get_sclk(struct radeon_device *rdev, bool low)
 {
-	struct trinity_ps *requested_state = trinity_get_ps(rdev->pm.dpm.requested_ps);
+	struct trinity_power_info *pi = trinity_get_pi(rdev);
+	struct trinity_ps *requested_state = trinity_get_ps(&pi->requested_rps);
 
 	if (low)
 		return requested_state->levels[0].sclk;

drivers/gpu/drm/radeon/trinity_dpm.h

@@ -97,7 +97,6 @@ struct trinity_power_info {
 	u32 thermal_auto_throttling;
 	struct trinity_sys_info sys_info;
 	struct trinity_pl boot_pl;
-	struct trinity_ps current_ps;
 	u32 min_sclk_did;
 	bool enable_nbps_policy;
 	bool voltage_drop_in_dce;
@@ -110,7 +109,10 @@ struct trinity_power_info {
 	bool enable_dpm;
 	bool enable_sclk_ds;
 	bool uvd_dpm;
-	struct trinity_ps hw_ps;
+	struct radeon_ps current_rps;
+	struct trinity_ps current_ps;
+	struct radeon_ps requested_rps;
+	struct trinity_ps requested_ps;
 };
 
 #define TRINITY_AT_DFLT            30