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| author | Jacopo Mondi <jacopo+renesas@jmondi.org> | 2021-06-16 14:46:08 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2021-06-17 11:30:21 +0200 |
| commit | 9e0bf8393d0602cc7fda749b77cf8ec7f81249cb (patch) | |
| tree | dcd0ea9d907ca7dfed2008c0b548732d3c933235 /drivers/media/i2c/max9271.h | |
| parent | ad01032aaf437c526d7135384bb4f998828d0cfc (diff) | |
| download | linux-9e0bf8393d0602cc7fda749b77cf8ec7f81249cb.tar.bz2 | |
media: i2c: max9271: Introduce wake_up() function
The MAX9271 chip manual prescribes a delay of 5 milliseconds
after the chip exits from low power state.
Add a new function to the max9271 library driver that wakes up the chip
with a dummy i2c transaction and implements the correct delay of 5
milliseconds after the chip exits from low power state.
Use the newly introduced function in the rdacm20 and rdacm21 camera
drivers. The former was not respecting the required delay while the
latter was waiting for a too-short timeout.
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/media/i2c/max9271.h')
| -rw-r--r-- | drivers/media/i2c/max9271.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/media/i2c/max9271.h b/drivers/media/i2c/max9271.h index d78fb21441e9..dc5e4e70ba6f 100644 --- a/drivers/media/i2c/max9271.h +++ b/drivers/media/i2c/max9271.h @@ -86,6 +86,15 @@ struct max9271_device { }; /** + * max9271_wake_up() - Wake up the serializer by issuing an i2c transaction + * @dev: The max9271 device + * + * This function shall be called before any other interaction with the + * serializer. + */ +void max9271_wake_up(struct max9271_device *dev); + +/** * max9271_set_serial_link() - Enable/disable serial link * @dev: The max9271 device * @enable: Serial link enable/disable flag |