platform/x86/amd/pmf: Register notify handler only if SPS is enabled

Power source notify handler is getting registered even when none of the
PMF feature in enabled leading to a crash.

...
[   22.592162] Call Trace:
[   22.592164]  <TASK>
[   22.592164]  ? rcu_note_context_switch+0x5e0/0x660
[   22.592166]  ? __warn+0x81/0x130
[   22.592171]  ? rcu_note_context_switch+0x5e0/0x660
[   22.592172]  ? report_bug+0x171/0x1a0
[   22.592175]  ? prb_read_valid+0x1b/0x30
[   22.592177]  ? handle_bug+0x3c/0x80
[   22.592178]  ? exc_invalid_op+0x17/0x70
[   22.592179]  ? asm_exc_invalid_op+0x1a/0x20
[   22.592182]  ? rcu_note_context_switch+0x5e0/0x660
[   22.592183]  ? acpi_ut_delete_object_desc+0x86/0xb0
[   22.592186]  ? acpi_ut_update_ref_count.part.0+0x22d/0x930
[   22.592187]  __schedule+0xc0/0x1410
[   22.592189]  ? ktime_get+0x3c/0xa0
[   22.592191]  ? lapic_next_event+0x1d/0x30
[   22.592193]  ? hrtimer_start_range_ns+0x25b/0x350
[   22.592196]  schedule+0x5e/0xd0
[   22.592197]  schedule_hrtimeout_range_clock+0xbe/0x140
[   22.592199]  ? __pfx_hrtimer_wakeup+0x10/0x10
[   22.592200]  usleep_range_state+0x64/0x90
[   22.592203]  amd_pmf_send_cmd+0x106/0x2a0 [amd_pmf bddfe0fe3712aaa99acce3d5487405c5213c6616]
[   22.592207]  amd_pmf_update_slider+0x56/0x1b0 [amd_pmf bddfe0fe3712aaa99acce3d5487405c5213c6616]
[   22.592210]  amd_pmf_set_sps_power_limits+0x72/0x80 [amd_pmf bddfe0fe3712aaa99acce3d5487405c5213c6616]
[   22.592213]  amd_pmf_pwr_src_notify_call+0x49/0x90 [amd_pmf bddfe0fe3712aaa99acce3d5487405c5213c6616]
[   22.592216]  notifier_call_chain+0x5a/0xd0
[   22.592218]  atomic_notifier_call_chain+0x32/0x50
...

Fix this by moving the registration of source change notify handler only
when SPS(Static Slider) is advertised as supported.

Reported-by: Allen Zhong <allen@atr.me>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217571
Fixes: 4c71ae4 ("platform/x86/amd/pmf: Add support SPS PMF feature")
Tested-by: Patil Rajesh Reddy <Patil.Reddy@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20230622060309.310001-1-Shyam-sundar.S-k@amd.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/amd/pmf/core.c

@@ -297,6 +297,8 @@ static void amd_pmf_init_features(struct amd_pmf_dev *dev)
 	/* Enable Static Slider */
 	if (is_apmf_func_supported(dev, APMF_FUNC_STATIC_SLIDER_GRANULAR)) {
 		amd_pmf_init_sps(dev);
+		dev->pwr_src_notifier.notifier_call = amd_pmf_pwr_src_notify_call;
+		power_supply_reg_notifier(&dev->pwr_src_notifier);
 		dev_dbg(dev->dev, "SPS enabled and Platform Profiles registered\n");
 	}
 
@@ -315,8 +317,10 @@ static void amd_pmf_init_features(struct amd_pmf_dev *dev)
 
 static void amd_pmf_deinit_features(struct amd_pmf_dev *dev)
 {
-	if (is_apmf_func_supported(dev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
+	if (is_apmf_func_supported(dev, APMF_FUNC_STATIC_SLIDER_GRANULAR)) {
+		power_supply_unreg_notifier(&dev->pwr_src_notifier);
 		amd_pmf_deinit_sps(dev);
+	}
 
 	if (is_apmf_func_supported(dev, APMF_FUNC_AUTO_MODE)) {
 		amd_pmf_deinit_auto_mode(dev);
@@ -399,9 +403,6 @@ static int amd_pmf_probe(struct platform_device *pdev)
 	apmf_install_handler(dev);
 	amd_pmf_dbgfs_register(dev);
 
-	dev->pwr_src_notifier.notifier_call = amd_pmf_pwr_src_notify_call;
-	power_supply_reg_notifier(&dev->pwr_src_notifier);
-
 	dev_info(dev->dev, "registered PMF device successfully\n");
 
 	return 0;
@@ -411,7 +412,6 @@ static void amd_pmf_remove(struct platform_device *pdev)
 {
 	struct amd_pmf_dev *dev = platform_get_drvdata(pdev);
 
-	power_supply_unreg_notifier(&dev->pwr_src_notifier);
 	amd_pmf_deinit_features(dev);
 	apmf_acpi_deinit(dev);
 	amd_pmf_dbgfs_unregister(dev);