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Commit 4befedc0 authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Herbert Xu
Browse files

i2c: acpi: permit bus speed to be discovered after enumeration 



Currently, the I2C ACPI enumeration code only permits the max bus rate
to be discovered before enumerating the slaves on the bus. In some
cases, drivers for slave devices may require this information, e.g.,
some ATmel crypto drivers need to generate a so-called wake token
of a fixed duration, regardless of the bus rate.

So tweak the code so i2c_acpi_lookup_speed() is able to obtain this
information after enumeration as well.

Acked-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 8a82451b

drivers/i2c/i2c-core-acpi.c

+4 −2
Original line number Diff line number Diff line
@@ -115,8 +115,7 @@ static int i2c_acpi_do_lookup(struct acpi_device *adev, 
	struct list_head resource_list;

	int ret;



	if (acpi_bus_get_status(adev) || !adev->status.present ||

	    acpi_device_enumerated(adev))

	if (acpi_bus_get_status(adev) || !adev->status.present)

		return -EINVAL;



	if (acpi_match_device_ids(adev, i2c_acpi_ignored_device_ids) == 0)
@@ -151,6 +150,9 @@ static int i2c_acpi_get_info(struct acpi_device *adev, 
	lookup.info = info;

	lookup.index = -1;



	if (acpi_device_enumerated(adev))

		return -EINVAL;



	ret = i2c_acpi_do_lookup(adev, &lookup);

	if (ret)

		return ret;