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Message-Id: <20210319164148.199192-5-jacopo+renesas@jmondi.org>
Date: Fri, 19 Mar 2021 17:41:33 +0100
From: Jacopo Mondi <jacopo+renesas@...ndi.org>
To: kieran.bingham+renesas@...asonboard.com,
laurent.pinchart+renesas@...asonboard.com,
niklas.soderlund+renesas@...natech.se, geert@...ux-m68k.org
Cc: Jacopo Mondi <jacopo+renesas@...ndi.org>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
linux-kernel@...r.kernel.org,
Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: [PATCH v3 04/19] media: i2c: max9286: Define high channel amplitude
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.
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
---
drivers/media/i2c/max9286.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index ed1cdefe7c30..9124d5fa6ea3 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -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);
/*
--
2.30.0
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