Re: [PATCH 01/23] i2c: amd-mp2: Remove #ifdef guards for PM related functions

[Paul Cercueil <paul@crapouillou.net>]

Hi Jonathan,

Le jeudi 06 juillet 2023 à 10:09 +0800, Jonathan Cameron a écrit :
> On Wed,  5 Jul 2023 22:42:52 +0200
> Paul Cercueil <paul@crapouillou.net> wrote:
> 
> > Use the new PM macros for the suspend and resume functions to be
> > automatically dropped by the compiler when CONFIG_PM or
> > CONFIG_PM_SLEEP are disabled, without having to use #ifdef guards.
> > 
> > This has the advantage of always compiling these functions in,
> > independently of any Kconfig option. Thanks to that, bugs and other
> > regressions are subsequently easier to catch.
> > 
> > Note that the use of the UNIVERSAL_DEV_PM_OPS() macro was likely to
> > be
> > wrong, as it sets the same callbacks for the runtime-PM and system
> > suspend/resume. This patch does not change this behaviour, but I
> > suspect
> > that it should be changed to use DEFINE_RUNTIME_DEV_PM_OPS()
> > instead, as
> > the current documentation for UNIVERSAL_DEV_PM_OPS() suggests.
> 
> I'd be tempted to leave this one alone because it'll be much harder
> to spot that it's an ex UNIVERSAL_DEV_PM_OPS() that needs some
> thinking
> about after this change.

Ok, that's a good point.

Cheers,
-Paul

> > 
> > Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> > 
> > ---
> > Cc: Elie Morisse <syniurge@gmail.com>
> > Cc: Shyam Sundar S K <shyam-sundar.s-k@amd.com>
> > ---
> >  drivers/i2c/busses/i2c-amd-mp2-pci.c  | 14 +++++---------
> >  drivers/i2c/busses/i2c-amd-mp2-plat.c |  8 ++------
> >  drivers/i2c/busses/i2c-amd-mp2.h      |  2 --
> >  3 files changed, 7 insertions(+), 17 deletions(-)
> > 
> > diff --git a/drivers/i2c/busses/i2c-amd-mp2-pci.c
> > b/drivers/i2c/busses/i2c-amd-mp2-pci.c
> > index 143165300949..114fe329279a 100644
> > --- a/drivers/i2c/busses/i2c-amd-mp2-pci.c
> > +++ b/drivers/i2c/busses/i2c-amd-mp2-pci.c
> > @@ -382,7 +382,6 @@ static void amd_mp2_pci_remove(struct pci_dev
> > *pci_dev)
> >         amd_mp2_clear_reg(privdata);
> >  }
> >  
> > -#ifdef CONFIG_PM
> >  static int amd_mp2_pci_suspend(struct device *dev)
> >  {
> >         struct pci_dev *pci_dev = to_pci_dev(dev);
> > @@ -434,9 +433,10 @@ static int amd_mp2_pci_resume(struct device
> > *dev)
> >         return ret;
> >  }
> >  
> > -static UNIVERSAL_DEV_PM_OPS(amd_mp2_pci_pm_ops,
> > amd_mp2_pci_suspend,
> > -                           amd_mp2_pci_resume, NULL);
> > -#endif /* CONFIG_PM */
> > +static const struct dev_pm_ops amd_mp2_pci_pm_ops = {
> > +       SYSTEM_SLEEP_PM_OPS(amd_mp2_pci_suspend,
> > amd_mp2_pci_resume)
> > +       RUNTIME_PM_OPS(amd_mp2_pci_suspend, amd_mp2_pci_resume,
> > NULL)
> > +};
> >  
> >  static const struct pci_device_id amd_mp2_pci_tbl[] = {
> >         {PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_MP2)},
> > @@ -449,11 +449,7 @@ static struct pci_driver amd_mp2_pci_driver =
> > {
> >         .id_table       = amd_mp2_pci_tbl,
> >         .probe          = amd_mp2_pci_probe,
> >         .remove         = amd_mp2_pci_remove,
> > -#ifdef CONFIG_PM
> > -       .driver = {
> > -               .pm     = &amd_mp2_pci_pm_ops,
> > -       },
> > -#endif
> > +       .driver.pm      = pm_ptr(&amd_mp2_pci_pm_ops),
> >  };
> >  module_pci_driver(amd_mp2_pci_driver);
> >  
> > diff --git a/drivers/i2c/busses/i2c-amd-mp2-plat.c
> > b/drivers/i2c/busses/i2c-amd-mp2-plat.c
> > index 112fe2bc5662..4c677aeaca29 100644
> > --- a/drivers/i2c/busses/i2c-amd-mp2-plat.c
> > +++ b/drivers/i2c/busses/i2c-amd-mp2-plat.c
> > @@ -183,7 +183,6 @@ static const struct i2c_algorithm
> > i2c_amd_algorithm = {
> >         .functionality = i2c_amd_func,
> >  };
> >  
> > -#ifdef CONFIG_PM
> >  static int i2c_amd_suspend(struct amd_i2c_common *i2c_common)
> >  {
> >         struct amd_i2c_dev *i2c_dev =
> > amd_i2c_dev_common(i2c_common);
> > @@ -198,7 +197,6 @@ static int i2c_amd_resume(struct amd_i2c_common
> > *i2c_common)
> >  
> >         return i2c_amd_enable_set(i2c_dev, true);
> >  }
> > -#endif
> >  
> >  static const u32 supported_speeds[] = {
> >         I2C_MAX_HIGH_SPEED_MODE_FREQ,
> > @@ -276,10 +274,8 @@ static int i2c_amd_probe(struct
> > platform_device *pdev)
> >         platform_set_drvdata(pdev, i2c_dev);
> >  
> >         i2c_dev->common.cmd_completion = &i2c_amd_cmd_completion;
> > -#ifdef CONFIG_PM
> > -       i2c_dev->common.suspend = &i2c_amd_suspend;
> > -       i2c_dev->common.resume = &i2c_amd_resume;
> > -#endif
> > +       i2c_dev->common.suspend = pm_ptr(&i2c_amd_suspend);
> > +       i2c_dev->common.resume = pm_ptr(&i2c_amd_resume);
> >  
> >         /* Register the adapter */
> >         amd_mp2_pm_runtime_get(mp2_dev);
> > diff --git a/drivers/i2c/busses/i2c-amd-mp2.h
> > b/drivers/i2c/busses/i2c-amd-mp2.h
> > index 018a42de8b1e..40f3cdcc60aa 100644
> > --- a/drivers/i2c/busses/i2c-amd-mp2.h
> > +++ b/drivers/i2c/busses/i2c-amd-mp2.h
> > @@ -160,10 +160,8 @@ struct amd_i2c_common {
> >         enum speed_enum i2c_speed;
> >         u8 *dma_buf;
> >         dma_addr_t dma_addr;
> > -#ifdef CONFIG_PM
> >         int (*suspend)(struct amd_i2c_common *i2c_common);
> >         int (*resume)(struct amd_i2c_common *i2c_common);
> > -#endif /* CONFIG_PM */
> >  };
> >  
> >  /**
>