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Date: Sat, 31 May 2014 14:29:23 +0800
From: Zhang Rui <rui.zhang@...el.com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
matthew.garrett@...ula.com, mika.westerberg@...ux.intel.com
Subject: Re: [Update][PATCH 10/10] ACPI / scan: use platform bus type by
default for _HID enumeration
On Sat, 2014-05-31 at 13:56 +0800, Zhang Rui wrote:
> On Fri, 2014-05-30 at 14:35 +0200, Rafael J. Wysocki wrote:
> > From: Zhang Rui <rui.zhang@...el.com>
> >
> > Because of the growing demand for enumerating ACPI devices to
> > platform bus, change the code to enumerate ACPI device objects to
> > platform bus by default. Namely, create platform devices for the
> > ACPI device objects that
> > 1. Have pnp.type.platform_id set (device objects with _HID currently).
> > 2. Do not have a scan handler attached.
> > 3. Are not SPI/I2C slave devices (that should be enumerated to the
> > appropriate buses bus by their parent).
> >
> > Signed-off-by: Zhang Rui <rui.zhang@...el.com>
> > [rjw: Subject and changelog, rebase and code cleanup]
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > ---
> >
> > Changelog rework and minor cleanups.
> >
> > Thanks!
> >
> > ---
> > drivers/acpi/acpi_platform.c | 40 ++++++++--------------------------------
> > drivers/acpi/scan.c | 42 +++++++++++++++++++++++++++++++++++++++++-
> > 2 files changed, 49 insertions(+), 33 deletions(-)
> >
> > Index: linux-pm/drivers/acpi/acpi_platform.c
> > ===================================================================
> > --- linux-pm.orig/drivers/acpi/acpi_platform.c
> > +++ linux-pm/drivers/acpi/acpi_platform.c
> > @@ -22,21 +22,11 @@
> >
> > ACPI_MODULE_NAME("platform");
> >
> > -/*
> > - * The following ACPI IDs are known to be suitable for representing as
> > - * platform devices.
> > - */
> > -static const struct acpi_device_id acpi_platform_device_ids[] = {
> > -
> > - { "PNP0D40" },
> > - { "VPC2004" },
> > - { "BCM4752" },
> > -
> > - /* Intel Smart Sound Technology */
> > - { "INT33C8" },
> > - { "80860F28" },
> > -
> > - { }
> > +static const struct acpi_device_id forbidden_id_list[] = {
> > + {"PNP0000", 0}, /* PIC */
> > + {"PNP0100", 0}, /* Timer */
> > + {"PNP0200", 0}, /* AT DMA Controller */
> > + {"", 0},
> > };
> >
> > /**
> > @@ -63,6 +53,9 @@ struct platform_device *acpi_create_plat
> > if (adev->physical_node_count)
> > return NULL;
> >
> > + if (!acpi_match_device_ids(adev, forbidden_id_list))
> > + return ERR_PTR(-EINVAL);
> > +
> > INIT_LIST_HEAD(&resource_list);
> > count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
> > if (count < 0) {
> > @@ -120,20 +113,3 @@ struct platform_device *acpi_create_plat
> > kfree(resources);
> > return pdev;
> > }
> > -
> > -static int acpi_platform_attach(struct acpi_device *adev,
> > - const struct acpi_device_id *id)
> > -{
> > - acpi_create_platform_device(adev);
> > - return 1;
> > -}
> > -
> this patch does not apply.
> we do not have the above code in drivers/acpi/acpi_platform.c.
I see. this patch is made based on the drivers/acpi/acpi_platform.c
changes in your linux-next branch. Sorry for the noise.
thanks,
rui
>
> thanks,
> rui
> > -static struct acpi_scan_handler platform_handler = {
> > - .ids = acpi_platform_device_ids,
> > - .attach = acpi_platform_attach,
> > -};
> > -
> > -void __init acpi_platform_init(void)
> > -{
> > - acpi_scan_add_handler(&platform_handler);
> > -}
> > Index: linux-pm/drivers/acpi/scan.c
> > ===================================================================
> > --- linux-pm.orig/drivers/acpi/scan.c
> > +++ linux-pm/drivers/acpi/scan.c
> > @@ -2070,6 +2070,44 @@ static acpi_status acpi_bus_check_add(ac
> > return AE_OK;
> > }
> >
> > +static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
> > +{
> > + bool *is_spi_i2c_slave_p = data;
> > +
> > + if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
> > + return 1;
> > +
> > + /*
> > + * devices that are connected to UART still need to be enumerated to
> > + * platform bus
> > + */
> > + if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
> > + *is_spi_i2c_slave_p = true;
> > +
> > + /* no need to do more checking */
> > + return -1;
> > +}
> > +
> > +static void acpi_default_enumeration(struct acpi_device *device)
> > +{
> > + struct list_head resource_list;
> > + bool is_spi_i2c_slave = false;
> > +
> > + if (!device->pnp.type.platform_id || device->handler)
> > + return;
> > +
> > + /*
> > + * Do not enemerate SPI/I2C slaves as they will be enuerated by their
> > + * respective parents.
> > + */
> > + INIT_LIST_HEAD(&resource_list);
> > + acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
> > + &is_spi_i2c_slave);
> > + acpi_dev_free_resource_list(&resource_list);
> > + if (!is_spi_i2c_slave)
> > + acpi_create_platform_device(device);
> > +}
> > +
> > static int acpi_scan_attach_handler(struct acpi_device *device)
> > {
> > struct acpi_hardware_id *hwid;
> > @@ -2095,6 +2133,9 @@ static int acpi_scan_attach_handler(stru
> > break;
> > }
> > }
> > + if (!ret)
> > + acpi_default_enumeration(device);
> > +
> > return ret;
> > }
> >
> > @@ -2254,7 +2295,6 @@ int __init acpi_scan_init(void)
> > acpi_pci_root_init();
> > acpi_pci_link_init();
> > acpi_processor_init();
> > - acpi_platform_init();
> > acpi_lpss_init();
> > acpi_cmos_rtc_init();
> > acpi_container_init();
> >
> > --
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>
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