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media: i2c: max9286: Define high channel amplitude

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Provide a macro to define the reverse channel amplitude to
be used to compensate the remote serializer noise immunity.

While at it, update a comment.

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>
This commit is contained in:
Jacopo Mondi
2021-06-16 14:46:05 +02:00
committed by Mauro Carvalho Chehab
parent 902edc2a1c
commit 731c24ffa2
1 changed files with 3 additions and 2 deletions
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5
drivers/media/i2c/max9286.c
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@@ -113,6 +113,7 @@
#define MAX9286_REV_TRF(n) ((n) << 4)
#define MAX9286_REV_AMP(n) ((((n) - 30) / 10) << 1) /* in mV */
#define MAX9286_REV_AMP_X BIT(0)
#define MAX9286_REV_AMP_HIGH 170
/* Register 0x3f */
#define MAX9286_EN_REV_CFG BIT(6)
#define MAX9286_REV_FLEN(n) ((n) - 20)
@@ -567,12 +568,12 @@ static int max9286_notify_bound(struct v4l2_async_notifier *notifier,
* channels:
*
* - Increase the reverse channel amplitude to compensate for the
* remote ends high threshold, if not done already
* remote ends high threshold
* - Verify all configuration links are properly detected
* - Disable auto-ack as communication on the control channel are now
* stable.
*/
max9286_reverse_channel_setup(priv, 170);
max9286_reverse_channel_setup(priv, MAX9286_REV_AMP_HIGH);
max9286_check_config_link(priv, priv->source_mask);
/*