drm/radeon/dpm: implement UVD powergating for KB/KV

Powergate the UVD block when not in use to save power.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/cik.c

@@ -69,7 +69,7 @@ static void cik_pcie_gen3_enable(struct radeon_device *rdev);
 static void cik_program_aspm(struct radeon_device *rdev);
 static void cik_init_pg(struct radeon_device *rdev);
 static void cik_init_cg(struct radeon_device *rdev);
-static void cik_uvd_resume(struct radeon_device *rdev);
+void cik_uvd_resume(struct radeon_device *rdev);
 
 /* get temperature in millidegrees */
 int ci_get_temp(struct radeon_device *rdev)
@@ -8600,7 +8600,7 @@ int cik_set_uvd_clocks(struct radeon_device *rdev, u32 vclk, u32 dclk)
 	return r;
 }
 
-static void cik_uvd_resume(struct radeon_device *rdev)
+void cik_uvd_resume(struct radeon_device *rdev)
 {
 	uint64_t addr;
 	uint32_t size;

drivers/gpu/drm/radeon/kv_dpm.c

@@ -49,7 +49,7 @@ static int kv_set_thermal_temperature_range(struct radeon_device *rdev,
 					    int min_temp, int max_temp);
 static int kv_init_fps_limits(struct radeon_device *rdev);
 
-static void kv_dpm_powergate_uvd(struct radeon_device *rdev, bool gate);
+void kv_dpm_powergate_uvd(struct radeon_device *rdev, bool gate);
 static void kv_dpm_powergate_vce(struct radeon_device *rdev, bool gate);
 static void kv_dpm_powergate_samu(struct radeon_device *rdev, bool gate);
 static void kv_dpm_powergate_acp(struct radeon_device *rdev, bool gate);
@@ -59,6 +59,10 @@ extern void cik_exit_rlc_safe_mode(struct radeon_device *rdev);
 extern void cik_update_cg(struct radeon_device *rdev,
 			  u32 block, bool enable);
 
+extern void cik_uvd_resume(struct radeon_device *rdev);
+extern int r600_uvd_init(struct radeon_device *rdev, bool ring_test);
+extern void r600_do_uvd_stop(struct radeon_device *rdev);
+
 static const struct kv_lcac_config_values sx_local_cac_cfg_kv[] =
 {
 	{  0,       4,        1    },
@@ -1201,6 +1205,7 @@ int kv_dpm_enable(struct radeon_device *rdev)
 	kv_dpm_powergate_acp(rdev, true);
 	kv_dpm_powergate_samu(rdev, true);
 	kv_dpm_powergate_vce(rdev, true);
+	kv_dpm_powergate_uvd(rdev, true);
 
 	kv_update_current_ps(rdev, rdev->pm.dpm.boot_ps);
 
@@ -1458,7 +1463,7 @@ static int kv_update_acp_dpm(struct radeon_device *rdev, bool gate)
 	return kv_enable_acp_dpm(rdev, !gate);
 }
 
-static void kv_dpm_powergate_uvd(struct radeon_device *rdev, bool gate)
+void kv_dpm_powergate_uvd(struct radeon_device *rdev, bool gate)
 {
 	struct kv_power_info *pi = kv_get_pi(rdev);
 
@@ -1468,13 +1473,18 @@ static void kv_dpm_powergate_uvd(struct radeon_device *rdev, bool gate)
 	pi->uvd_power_gated = gate;
 
 	if (gate) {
-		kv_update_uvd_dpm(rdev, true);
+		r600_do_uvd_stop(rdev);
+		cik_update_cg(rdev, RADEON_CG_BLOCK_UVD, false);
+		kv_update_uvd_dpm(rdev, gate);
 		if (pi->caps_uvd_pg)
 			kv_notify_message_to_smu(rdev, PPSMC_MSG_UVDPowerOFF);
 	} else {
 		if (pi->caps_uvd_pg)
 			kv_notify_message_to_smu(rdev, PPSMC_MSG_UVDPowerON);
-		kv_update_uvd_dpm(rdev, false);
+		cik_uvd_resume(rdev);
+		r600_uvd_init(rdev, false);
+		cik_update_cg(rdev, RADEON_CG_BLOCK_UVD, true);
+		kv_update_uvd_dpm(rdev, gate);
 	}
 }
 
@@ -1714,7 +1724,6 @@ int kv_dpm_set_power_state(struct radeon_device *rdev)
 				return ret;
 			}
 #endif
-			kv_update_uvd_dpm(rdev, false);
 			kv_update_sclk_t(rdev);
 		}
 	} else {
@@ -1740,7 +1749,6 @@ int kv_dpm_set_power_state(struct radeon_device *rdev)
 				return ret;
 			}
 #endif
-			kv_update_uvd_dpm(rdev, false);
 			kv_update_sclk_t(rdev);
 			kv_enable_nb_dpm(rdev);
 		}
@@ -2502,7 +2510,7 @@ int kv_dpm_init(struct radeon_device *rdev)
 	pi->voltage_drop_t = 0;
 	pi->caps_sclk_throttle_low_notification = false;
 	pi->caps_fps = false; /* true? */
-	pi->caps_uvd_pg = false; /* XXX */
+	pi->caps_uvd_pg = true;
 	pi->caps_uvd_dpm = true;
 	pi->caps_vce_pg = false;
 	pi->caps_samu_pg = false;

drivers/gpu/drm/radeon/radeon_asic.c

@@ -2642,6 +2642,7 @@ static struct radeon_asic kv_asic = {
 		.print_power_state = &kv_dpm_print_power_state,
 		.debugfs_print_current_performance_level = &kv_dpm_debugfs_print_current_performance_level,
 		.force_performance_level = &kv_dpm_force_performance_level,
+		.powergate_uvd = &kv_dpm_powergate_uvd,
 	},
 	.pflip = {
 		.pre_page_flip = &evergreen_pre_page_flip,

drivers/gpu/drm/radeon/radeon_asic.h

@@ -784,5 +784,6 @@ void kv_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
 						    struct seq_file *m);
 int kv_dpm_force_performance_level(struct radeon_device *rdev,
 				   enum radeon_dpm_forced_level level);
+void kv_dpm_powergate_uvd(struct radeon_device *rdev, bool gate);
 
 #endif