From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Jacopo Mondi <jacopo+renesas@jmondi.org>
Cc: kieran.bingham+renesas@ideasonboard.com,
niklas.soderlund+renesas@ragnatech.se, geert@linux-m68k.org,
Mauro Carvalho Chehab <mchehab@kernel.org>,
linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 14/19] media: i2c: rdacm20: Enable noise immunity
Date: Sat, 20 Mar 2021 18:16:40 +0200 [thread overview]
Message-ID: <YFYf6NHwgJglCHkN@pendragon.ideasonboard.com> (raw)
In-Reply-To: <20210319164148.199192-15-jacopo+renesas@jmondi.org>
Hi Jacopo,
Thank you for the patch.
On Fri, Mar 19, 2021 at 05:41:43PM +0100, Jacopo Mondi wrote:
> Enable the noise immunity threshold at the end of the rdacm20
> initialization routine.
>
> The rdacm20 camera module has been so far tested with a startup
> delay that allowed the embedded MCU to program the serializer. If
> the initialization routine is run before the MCU programs the
> serializer and the image sensor and their addresses gets changed
> by the rdacm20 driver it is required to manually enable the noise
> immunity threshold to make the communication on the control channel
> more reliable.
>
> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> ---
> drivers/media/i2c/rdacm20.c | 14 +++++++++++++-
> 1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/i2c/rdacm20.c b/drivers/media/i2c/rdacm20.c
> index 2881e752efbe..554fd3b3ec3d 100644
> --- a/drivers/media/i2c/rdacm20.c
> +++ b/drivers/media/i2c/rdacm20.c
> @@ -518,7 +518,19 @@ static int rdacm20_init(struct v4l2_subdev *sd, unsigned int val)
>
> dev_info(dev->dev, "Identified MAX9271 + OV10635 device\n");
>
> - return 0;
> + /*
> + * Set reverse channel high threshold to increase noise immunity.
> + *
> + * This should be compensated by increasing the reverse channel
> + * amplitude on the remote deserializer side.
> + *
> + * TODO Inspect the embedded MCU programming sequence to make sure
> + * there are no conflicts with the configuration applied here.
> + *
> + * TODO Clarify the embedded MCU startup delay to avoid write
> + * collisions on the I2C bus.
> + */
> + return max9271_set_high_threshold(&dev->serializer, true);
> }
>
> static const struct v4l2_subdev_core_ops rdacm20_core_ops = {
--
Regards,
Laurent Pinchart
next prev parent reply other threads:[~2021-03-20 16:17 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-19 16:41 [PATCH v3 00/19] media: gmsl: Reliability improvement Jacopo Mondi
2021-03-19 16:41 ` [PATCH v3 01/19] media: i2c: max9286: Adjust parameters indent Jacopo Mondi
2021-03-19 16:41 ` [PATCH v3 02/19] media: i2c: max9286: Rename reverse_channel_mv Jacopo Mondi
2021-03-19 16:41 ` [PATCH v3 03/19] media: i2c: max9286: Cache channel amplitude Jacopo Mondi
2021-03-19 16:41 ` [PATCH v3 04/19] media: i2c: max9286: Define high " Jacopo Mondi
2021-03-19 16:41 ` [PATCH v3 05/19] media: v4l2-subdev: De-deprecate init() subdev op Jacopo Mondi
2021-03-20 15:42 ` Laurent Pinchart
2021-03-21 20:52 ` Sakari Ailus
2021-03-22 12:51 ` Jacopo Mondi
2021-03-26 11:37 ` Jacopo Mondi
2021-03-19 16:41 ` [PATCH v3 06/19] media: gmsl: Reimplement initialization sequence Jacopo Mondi
2021-03-20 15:46 ` Laurent Pinchart
2021-03-19 16:41 ` [PATCH v3 07/19] media: i2c: max9286: Rework comments in .bound() Jacopo Mondi
2021-03-19 16:41 ` [PATCH v3 08/19] media: i2c: max9271: Check max9271_write() return Jacopo Mondi
2021-03-19 16:41 ` [PATCH v3 09/19] media: i2c: max9271: Introduce wake_up() function Jacopo Mondi
2021-03-19 16:41 ` [PATCH v3 10/19] media: i2c: rdamc21: Fix warning on u8 cast Jacopo Mondi
2021-03-19 16:41 ` [PATCH v3 11/19] media: i2c: rdacm21: Add dealy after OV490 reset Jacopo Mondi
2021-03-19 16:49 ` Kieran Bingham
2021-03-20 15:52 ` Laurent Pinchart
2021-03-26 11:22 ` Jacopo Mondi
2021-03-19 16:41 ` [PATCH v3 12/19] media: i2c: rdacm21: Fix OV10640 powerup Jacopo Mondi
2021-03-19 16:41 ` [PATCH v3 13/19] media: i2c: rdacm21: Power up OV10640 before OV490 Jacopo Mondi
2021-03-20 16:14 ` Laurent Pinchart
2021-03-26 11:07 ` Jacopo Mondi
2021-03-19 16:41 ` [PATCH v3 14/19] media: i2c: rdacm20: Enable noise immunity Jacopo Mondi
2021-03-20 16:16 ` Laurent Pinchart [this message]
2021-03-19 16:41 ` [PATCH v3 15/19] media: i2c: rdacm20: Embed 'serializer' field Jacopo Mondi
2021-03-19 16:41 ` [PATCH v3 16/19] media: i2c: rdacm20: Replace goto with a loop Jacopo Mondi
2021-03-20 16:17 ` Laurent Pinchart
2021-03-19 16:41 ` [PATCH v3 17/19] media: i2c: rdacm20: Report camera module name Jacopo Mondi
2021-03-19 16:41 ` [PATCH v3 18/19] media: i2c: rdacm20: Check return values Jacopo Mondi
2021-03-19 16:41 ` [PATCH v3 19/19] media: i2c: rdacm20: Re-work ov10635 reset Jacopo Mondi
2021-03-20 16:24 ` Laurent Pinchart
2021-03-26 11:11 ` Jacopo Mondi
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