Re: [PATCH 0/4]Bind physical devices with ACPI devices - take 2

Li Shaohua
2005-01-18T01:20:50Z

On Mon, 2005-01-17 at 19:28, Pavel Machek wrote:
> Hi!
>
> > > The series of patches implement binding physical devices with ACPI
> > > devices. With it, device drivers can utilize methods provided by
> > > firmware (ACPI). These patches are against 2.6.10, please give your
> > > comments.
>
> > This is updated patches according to latest discussion.
> > Changes from last one:
> > 1. introduce new field 'firmware_data' in 'struct device', since people
> > complain rename 'platform_data. Greg, could you please check if the
> > comments I added in 'struct device' are correct?
> > 2. align to Pavel's latest PCI state convention work.
> > 3. Some cleanups and add more comments.
> > One issue is 'platform_pci_choose_state' doesn't get called, it should
> > be after Pavel updates the parameter of 'pci_choose_state'
>
> diff -puN drivers/pci/pci.c~acpi-pci-get-suspend-state-callback
> drivers/pci/pci.c
> --- 2.5/drivers/pci/pci.c~acpi-pci-get-suspend-state-callback
> 2005-01-17 12:54:05.357547072 +0800
> +++ 2.5-root/drivers/pci/pci.c 2005-01-17 13:08:50.835933896 +0800
> @@ -317,6 +317,7 @@ pci_set_power_state(struct pci_dev *dev,
> * Returns PCI power state suitable for given device and given system
> * message.
> */
> +int (*platform_pci_choose_state)(struct pci_dev *, pm_message_t) = 0;
>
> pci_power_t pci_choose_state(struct pci_dev *dev, u32 state)
> {
>
> Perhaps you want this to be "= NULL"?
I must be in sleep :). I will fix it soon.
>
>
> > @@ -208,6 +209,25 @@ acpi_status pci_osc_control_set(u32 flag
> > }
> > EXPORT_SYMBOL(pci_osc_control_set);
> >
> > +static int acpi_pci_choose_state(struct pci_dev *pdev,
> > + pm_message_t state)
> > +{
> > + char dstate_str[] = "_S0D";
> > + acpi_status status;
> > + unsigned long val;
> > + struct device *dev = &pdev->dev;
> > +
> > + /* state is PM_SUSPEND_* */
> > + if ((state >= PM_SUSPEND_MAX) || !DEVICE_ACPI_HANDLE(dev))
> > + return -EINVAL;
> > + dstate_str[2] += (int __force)state;
>
> When I'm done, you will not be able to just retype state to
> integer... Perhaps you want to do pci_choose_state first; that gets
> you pci_power_t and that one *is* okay to retype to int?
Firmware possibly will can't return a useful suspend state (Either
firmware doesn't define such device or evaluation failed), that's why I
return an int. I suppose pci_choose_state will do something:
ret = firmware_pci_choose_state(dev, state);
if (ret >= 0)
pci_state = ret;
switch(pci_state) {
case 0: return PCI_D0;
.....
}

Thanks,
Shaohua

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