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media: i2c: max9286: Cache channel amplitude

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Cache the current channel amplitude in a driver variable
to skip updating it if the newly requested value is the same
as the currently configured one.

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 14:46:04 +02:00 committed by Mauro Carvalho Chehab
parent f78723eb62
commit 902edc2a1c
1 changed files with 10 additions and 3 deletions
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13
drivers/media/i2c/max9286.c
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@ -165,6 +165,7 @@ struct max9286_priv {
/* The initial reverse control channel amplitude. */
u32 init_rev_chan_mv;
u32 rev_chan_mv;
struct v4l2_ctrl_handler ctrls;
struct v4l2_ctrl *pixelrate;
@ -341,8 +342,15 @@ static void max9286_configure_i2c(struct max9286_priv *priv, bool localack)
static void max9286_reverse_channel_setup(struct max9286_priv *priv,
unsigned int chan_amplitude)
{
u8 chan_config;
if (priv->rev_chan_mv == chan_amplitude)
return;
priv->rev_chan_mv = chan_amplitude;
/* Reverse channel transmission time: default to 1. */
u8 chan_config = MAX9286_REV_TRF(1);
chan_config = MAX9286_REV_TRF(1);
/*
* Reverse channel setup.
@ -564,8 +572,7 @@ static int max9286_notify_bound(struct v4l2_async_notifier *notifier,
* - Disable auto-ack as communication on the control channel are now
* stable.
*/
if (priv->init_rev_chan_mv < 170)
max9286_reverse_channel_setup(priv, 170);
max9286_reverse_channel_setup(priv, 170);
max9286_check_config_link(priv, priv->source_mask);
/*