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Date: Tue, 14 Feb 2023 16:36:27 +0000
From: "Limonciello, Mario" <Mario.Limonciello@....com>
To: Arnd Bergmann <arnd@...nel.org>,
"S-k, Shyam-sundar" <Shyam-sundar.S-k@....com>,
Hans de Goede <hdegoede@...hat.com>,
Mark Gross <markgross@...nel.org>
CC: Arnd Bergmann <arnd@...db.de>,
Nathan Chancellor <nathan@...nel.org>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
"platform-driver-x86@...r.kernel.org"
<platform-driver-x86@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] platform/x86/amd: pmc: remove CONFIG_SUSPEND checks
[Public]
> -----Original Message-----
> From: Arnd Bergmann <arnd@...nel.org>
> Sent: Tuesday, February 14, 2023 09:25
> To: S-k, Shyam-sundar <Shyam-sundar.S-k@....com>; Hans de Goede
> <hdegoede@...hat.com>; Mark Gross <markgross@...nel.org>
> Cc: Arnd Bergmann <arnd@...db.de>; Limonciello, Mario
> <Mario.Limonciello@....com>; Nathan Chancellor <nathan@...nel.org>;
> Rafael J. Wysocki <rafael.j.wysocki@...el.com>; platform-driver-
> x86@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [PATCH] platform/x86/amd: pmc: remove CONFIG_SUSPEND checks
>
> From: Arnd Bergmann <arnd@...db.de>
>
> 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 by using
> DEFINE_SIMPLE_DEV_PM_OPS()
> to replace all the #ifdefs, letting gcc drop any of the unused functions
> silently.
>
> Fixes: b0d4bb973539 ("platform/x86/amd: pmc: Write dummy postcode into
> the STB DRAM")
I suspect this is not an appropriate fixes tag. SIMPLE_DEV_PM_OPS only came in
8e60615e89321 ("platform/x86/amd: pmc: Disable IRQ1 wakeup for RN/CZN")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> drivers/platform/x86/amd/pmc.c | 25 ++++++-------------------
> 1 file changed, 6 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/platform/x86/amd/pmc.c
> b/drivers/platform/x86/amd/pmc.c
> index ab05b9ee6655..641085906baf 100644
> --- a/drivers/platform/x86/amd/pmc.c
> +++ b/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 +1008,10 @@ 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 (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");
> -#endif
>
> amd_pmc_dbgfs_register(dev);
> return 0;
> @@ -1035,9 +1025,8 @@ 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 +1050,7 @@ 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,
> --
> 2.39.1
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