platform/x86/amd: pmc: remove CONFIG_SUSPEND checks

The amd_pmc_write_stb() function was previously hidden in an
ifdef to avoid a warning when CONFIG_SUSPEND is disabled, but
now there is an additional caller:

drivers/platform/x86/amd/pmc.c: In function 'amd_pmc_stb_debugfs_open_v2':
drivers/platform/x86/amd/pmc.c:256:8: error: implicit declaration of function 'amd_pmc_write_stb'; did you mean 'amd_pmc_read_stb'? [-Werror=implicit-function-declaration]
  256 |  ret = amd_pmc_write_stb(dev, AMD_PMC_STB_DUMMY_PC);
      |        ^~~~~~~~~~~~~~~~~
      |        amd_pmc_read_stb

There is now an easier way to handle this using DEFINE_SIMPLE_DEV_PM_OPS()
to replace all the #ifdefs, letting gcc drop any of the unused functions
silently.

Fixes: b0d4bb9 ("platform/x86/amd: pmc: Write dummy postcode into the STB DRAM")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20230214152512.806188-1-arnd@kernel.org
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/amd/pmc.c

@@ -171,9 +171,7 @@ MODULE_PARM_DESC(disable_workarounds, "Disable workarounds for platform bugs");
 static struct amd_pmc_dev pmc;
 static int amd_pmc_send_cmd(struct amd_pmc_dev *dev, u32 arg, u32 *data, u8 msg, bool ret);
 static int amd_pmc_read_stb(struct amd_pmc_dev *dev, u32 *buf);
-#ifdef CONFIG_SUSPEND
 static int amd_pmc_write_stb(struct amd_pmc_dev *dev, u32 data);
-#endif
 
 static inline u32 amd_pmc_reg_read(struct amd_pmc_dev *dev, int reg_offset)
 {
@@ -386,7 +384,6 @@ static int get_metrics_table(struct amd_pmc_dev *pdev, struct smu_metrics *table
 	return 0;
 }
 
-#ifdef CONFIG_SUSPEND
 static void amd_pmc_validate_deepest(struct amd_pmc_dev *pdev)
 {
 	struct smu_metrics table;
@@ -400,7 +397,6 @@ static void amd_pmc_validate_deepest(struct amd_pmc_dev *pdev)
 		dev_dbg(pdev->dev, "Last suspend in deepest state for %lluus\n",
 			 table.timein_s0i3_lastcapture);
 }
-#endif
 
 static int amd_pmc_get_smu_version(struct amd_pmc_dev *dev)
 {
@@ -673,7 +669,6 @@ static int amd_pmc_send_cmd(struct amd_pmc_dev *dev, u32 arg, u32 *data, u8 msg,
 	return rc;
 }
 
-#ifdef CONFIG_SUSPEND
 static int amd_pmc_get_os_hint(struct amd_pmc_dev *dev)
 {
 	switch (dev->cpu_id) {
@@ -861,9 +856,7 @@ static int __maybe_unused amd_pmc_suspend_handler(struct device *dev)
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(amd_pmc_pm, amd_pmc_suspend_handler, NULL);
-
-#endif
+static DEFINE_SIMPLE_DEV_PM_OPS(amd_pmc_pm, amd_pmc_suspend_handler, NULL);
 
 static const struct pci_device_id pmc_pci_ids[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, AMD_CPU_ID_PS) },
@@ -905,7 +898,6 @@ static int amd_pmc_s2d_init(struct amd_pmc_dev *dev)
 	return 0;
 }
 
-#ifdef CONFIG_SUSPEND
 static int amd_pmc_write_stb(struct amd_pmc_dev *dev, u32 data)
 {
 	int err;
@@ -926,7 +918,6 @@ static int amd_pmc_write_stb(struct amd_pmc_dev *dev, u32 data)
 
 	return 0;
 }
-#endif
 
 static int amd_pmc_read_stb(struct amd_pmc_dev *dev, u32 *buf)
 {
@@ -1017,11 +1008,11 @@ static int amd_pmc_probe(struct platform_device *pdev)
 	}
 
 	platform_set_drvdata(pdev, dev);
-#ifdef CONFIG_SUSPEND
-	err = acpi_register_lps0_dev(&amd_pmc_s2idle_dev_ops);
-	if (err)
-		dev_warn(dev->dev, "failed to register LPS0 sleep handler, expect increased power consumption\n");
-#endif
+	if (IS_ENABLED(CONFIG_SUSPEND)) {
+		err = acpi_register_lps0_dev(&amd_pmc_s2idle_dev_ops);
+		if (err)
+			dev_warn(dev->dev, "failed to register LPS0 sleep handler, expect increased power consumption\n");
+	}
 
 	amd_pmc_dbgfs_register(dev);
 	return 0;
@@ -1035,9 +1026,8 @@ static int amd_pmc_remove(struct platform_device *pdev)
 {
 	struct amd_pmc_dev *dev = platform_get_drvdata(pdev);
 
-#ifdef CONFIG_SUSPEND
-	acpi_unregister_lps0_dev(&amd_pmc_s2idle_dev_ops);
-#endif
+	if (IS_ENABLED(CONFIG_SUSPEND))
+		acpi_unregister_lps0_dev(&amd_pmc_s2idle_dev_ops);
 	amd_pmc_dbgfs_unregister(dev);
 	pci_dev_put(dev->rdev);
 	mutex_destroy(&dev->lock);
@@ -1061,9 +1051,7 @@ static struct platform_driver amd_pmc_driver = {
 		.name = "amd_pmc",
 		.acpi_match_table = amd_pmc_acpi_ids,
 		.dev_groups = pmc_groups,
-#ifdef CONFIG_SUSPEND
-		.pm = &amd_pmc_pm,
-#endif
+		.pm = pm_sleep_ptr(&amd_pmc_pm),
 	},
 	.probe = amd_pmc_probe,
 	.remove = amd_pmc_remove,