Cache the current channel amplitude in a driver variable
to skip updating it if the new requested value is the same
as the currently configured one.
Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
---
drivers/media/i2c/max9286.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index 1f14cd817fbf..4afb5ca06448 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -164,6 +164,7 @@ struct max9286_priv {
bool mux_open;
u32 init_rev_chan_mv;
+ u32 rev_chan_mv;
struct v4l2_ctrl_handler ctrls;
struct v4l2_ctrl *pixelrate;
@@ -340,8 +341,15 @@ 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.
@@ -563,8 +571,7 @@ 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);
/*
--
2.30.0
