Adjust the MAX9286 reverse channel amplitude to support devices which are not pre-programmed, like the RDACM21 camera module. The de-serializer starts with a 100mV channel amplitude, and increases it to 170mV after all remote ends have probed and enabled their 'high-threshold' noise immunity feature. Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx> --- drivers/media/i2c/max9286.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c index 6852448284ea..992eb15a59be 100644 --- a/drivers/media/i2c/max9286.c +++ b/drivers/media/i2c/max9286.c @@ -535,6 +535,11 @@ static int max9286_notify_bound(struct v4l2_async_notifier *notifier, * - Disable auto-ack as communication on the control channel are now * stable. */ + max9286_write(priv, 0x3f, MAX9286_EN_REV_CFG | MAX9286_REV_FLEN(35)); + max9286_write(priv, 0x3b, MAX9286_REV_TRF(1) | MAX9286_REV_AMP(70) | + MAX9286_REV_AMP_X); + usleep_range(2000, 2500); + max9286_check_config_link(priv, priv->source_mask); /* @@ -953,8 +958,7 @@ static int max9286_setup(struct max9286_priv *priv) * high threshold enabled by the serializer driver. */ max9286_write(priv, 0x3f, MAX9286_EN_REV_CFG | MAX9286_REV_FLEN(35)); - max9286_write(priv, 0x3b, MAX9286_REV_TRF(1) | MAX9286_REV_AMP(70) | - MAX9286_REV_AMP_X); + max9286_write(priv, 0x3b, MAX9286_REV_TRF(1) | MAX9286_REV_AMP(100)); usleep_range(2000, 2500); /* -- 2.28.0
