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Date: Fri, 20 Apr 2012 11:19:13 +0800
From: Lin Ming <ming.m.lin@...el.com>
To: Aaron Lu <aaron.lu@....com>
Cc: "Rafael J. Wysocki" <rjw@...k.pl>, lenb <lenb@...nel.org>,
linux-acpi <linux-acpi@...r.kernel.org>,
linux-kernel@...r.kernel.org, Zhang Rui <rui.zhang@...el.com>,
"Huang, Ying" <ying.huang@...el.com>
Subject: Re: [PATCH v2] ACPI: D3 states cleanup
On Fri, 2012-04-20 at 10:23 +0800, Aaron Lu wrote:
> Hi,
>
> On Fri, Apr 20, 2012 at 09:19:09AM +0800, Lin Ming wrote:
> > There are two ACPI D3 states defined now:
> > ACPI_STATE_D3 and ACPI_STATE_D3_COLD.
> >
> > But the uses of these states are not clear/correct in some code.
> > For example, some code refer ACPI_STATE_D3 as D3hot and others refer
> > it as D3cold.
> >
> > This patch introduces ACPI_STATE_D3_HOT to refer to ACPI D3hot state.
> > And changes ACPI_STATE_D3 to refer to ACPI D3cold state only.
> > Also redefines ACPI_STATE_D3_COLD the same as ACPI_STATE_D3.
> >
>
> With this patch now, if a device has _PS3, then we will set its D3hot
> flag valid. This doesn't feel right to me, since per our discussion the
> other day, we should assume _PS3 will put the device into D3cold.
>
> Or do you mean: if _PS3 is available, then both D3hot and D3cold is
> valid from the perspective of acpi, it is the individual driver's
> responsibility to decide which state is actually valid and will be used.
Right.
ACPI_STATE_D3(same as ACPI_STATE_D3_COLD now) is always valid.
Lin Ming
>
> -Aaron
>
> > Acked-by: Rafael J. Wysocki <rjw@...k.pl>
> > Signed-off-by: Lin Ming <ming.m.lin@...el.com>
> > ---
> > drivers/acpi/power.c | 2 +-
> > drivers/acpi/scan.c | 9 +--------
> > drivers/pci/pci-acpi.c | 4 ++--
> > include/acpi/actypes.h | 7 ++++---
> > 4 files changed, 8 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
> > index 7049a7d..330bb4d 100644
> > --- a/drivers/acpi/power.c
> > +++ b/drivers/acpi/power.c
> > @@ -631,7 +631,7 @@ int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
> > * We know a device's inferred power state when all the resources
> > * required for a given D-state are 'on'.
> > */
> > - for (i = ACPI_STATE_D0; i < ACPI_STATE_D3; i++) {
> > + for (i = ACPI_STATE_D0; i < ACPI_STATE_D3_HOT; i++) {
> > list = &device->power.states[i].resources;
> > if (list->count < 1)
> > continue;
> > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> > index 767e2dc..fbf38ad 100644
> > --- a/drivers/acpi/scan.c
> > +++ b/drivers/acpi/scan.c
> > @@ -869,7 +869,7 @@ static int acpi_bus_get_power_flags(struct acpi_device *device)
> > /*
> > * Enumerate supported power management states
> > */
> > - for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
> > + for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
> > struct acpi_device_power_state *ps = &device->power.states[i];
> > char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
> >
> > @@ -884,13 +884,6 @@ static int acpi_bus_get_power_flags(struct acpi_device *device)
> > acpi_bus_add_power_resource(ps->resources.handles[j]);
> > }
> >
> > - /* The exist of _PR3 indicates D3Cold support */
> > - if (i == ACPI_STATE_D3) {
> > - status = acpi_get_handle(device->handle, object_name, &handle);
> > - if (ACPI_SUCCESS(status))
> > - device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
> > - }
> > -
> > /* Evaluate "_PSx" to see if we can do explicit sets */
> > object_name[2] = 'S';
> > status = acpi_get_handle(device->handle, object_name, &handle);
> > diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
> > index 0f150f2..1929c0c 100644
> > --- a/drivers/pci/pci-acpi.c
> > +++ b/drivers/pci/pci-acpi.c
> > @@ -200,7 +200,7 @@ static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
> > return PCI_D1;
> > case ACPI_STATE_D2:
> > return PCI_D2;
> > - case ACPI_STATE_D3:
> > + case ACPI_STATE_D3_HOT:
> > return PCI_D3hot;
> > case ACPI_STATE_D3_COLD:
> > return PCI_D3cold;
> > @@ -223,7 +223,7 @@ static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
> > [PCI_D0] = ACPI_STATE_D0,
> > [PCI_D1] = ACPI_STATE_D1,
> > [PCI_D2] = ACPI_STATE_D2,
> > - [PCI_D3hot] = ACPI_STATE_D3,
> > + [PCI_D3hot] = ACPI_STATE_D3_HOT,
> > [PCI_D3cold] = ACPI_STATE_D3
> > };
> > int error = -EINVAL;
> > diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
> > index eba6604..e8bcc47 100644
> > --- a/include/acpi/actypes.h
> > +++ b/include/acpi/actypes.h
> > @@ -499,9 +499,10 @@ typedef u64 acpi_integer;
> > #define ACPI_STATE_D0 (u8) 0
> > #define ACPI_STATE_D1 (u8) 1
> > #define ACPI_STATE_D2 (u8) 2
> > -#define ACPI_STATE_D3 (u8) 3
> > -#define ACPI_STATE_D3_COLD (u8) 4
> > -#define ACPI_D_STATES_MAX ACPI_STATE_D3_COLD
> > +#define ACPI_STATE_D3_HOT (u8) 3
> > +#define ACPI_STATE_D3 (u8) 4
> > +#define ACPI_STATE_D3_COLD ACPI_STATE_D3
> > +#define ACPI_D_STATES_MAX ACPI_STATE_D3
> > #define ACPI_D_STATE_COUNT 5
> >
> > #define ACPI_STATE_C0 (u8) 0
> > --
> > 1.7.2.5
> >
> >
> >
> >
>
--
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