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Date: Sat, 31 May 2014 13:56:56 +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 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.
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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