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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: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2019-05-24 18:26:46 +02:00 committed by Herbert Xu
parent 8a82451bd0
commit 4befedc045
1 changed files with 4 additions and 2 deletions
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6
drivers/i2c/i2c-core-acpi.c
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@ -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;