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From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
To: Jacopo Mondi <jacopo+renesas@jmondi.org>,
	laurent.pinchart+renesas@ideasonboard.com,
	niklas.soderlund+renesas@ragnatech.se, geert@linux-m68k.org
Cc: 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 07/16] media: i2c: rdacm2x: Fix wake up delay
Date: Wed, 17 Feb 2021 13:33:01 +0000	[thread overview]
Message-ID: <3e759da5-9bba-54ae-fe39-a7db2cbbb31c@ideasonboard.com> (raw)
In-Reply-To: <20210216174146.106639-8-jacopo+renesas@jmondi.org>

Hi Jacopo,


On 16/02/2021 17:41, Jacopo Mondi wrote:
> The MAX9271 chip manual prescribes a delay of 5 milliseconds
> after the chip exists from low power state.
> 
> Adjust the required delay in the rdacm21 camera module and add it
> to the rdacm20 that currently doesn't implement one.
> 

This sounds to me like it should be a common function in the max9271 module:

>         /* Verify communication with the MAX9271: ping to wakeup. */
>         dev->serializer.client->addr = MAX9271_DEFAULT_ADDR;
>         i2c_smbus_read_byte(dev->serializer.client);
>         usleep_range(5000, 8000);


Especially as that MAX9271_DEFAULT_ADDR should probably be handled
directly in the max9271.c file too, and the RDACM's shouldn't care about it.


If we end up moving the max9271 'library' into more of a module/device
then this would have to be done in it's 'probe' anyway, so it's likely
better handled down there...?

But ... it's not essential at this point in the series, so if you want
to keep this patch as is,

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
	> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> ---
>  drivers/media/i2c/rdacm20.c | 1 +
>  drivers/media/i2c/rdacm21.c | 2 +-
>  2 files changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/rdacm20.c b/drivers/media/i2c/rdacm20.c
> index ea30cc936531..39e4b4241870 100644
> --- a/drivers/media/i2c/rdacm20.c
> +++ b/drivers/media/i2c/rdacm20.c
> @@ -460,6 +460,7 @@ static int rdacm20_initialize(struct rdacm20_device *dev)
>  	/* Verify communication with the MAX9271: ping to wakeup. */
>  	dev->serializer.client->addr = MAX9271_DEFAULT_ADDR;
>  	i2c_smbus_read_byte(dev->serializer.client);
> +	usleep_range(5000, 8000);
>  
>  	/* Serial link disabled during config as it needs a valid pixel clock. */
>  	ret = max9271_set_serial_link(&dev->serializer, false);
> diff --git a/drivers/media/i2c/rdacm21.c b/drivers/media/i2c/rdacm21.c
> index 179d107f494c..b22a2ca5340b 100644
> --- a/drivers/media/i2c/rdacm21.c
> +++ b/drivers/media/i2c/rdacm21.c
> @@ -453,7 +453,7 @@ static int rdacm21_initialize(struct rdacm21_device *dev)
>  	/* Verify communication with the MAX9271: ping to wakeup. */
>  	dev->serializer.client->addr = MAX9271_DEFAULT_ADDR;
>  	i2c_smbus_read_byte(dev->serializer.client);
> -	usleep_range(3000, 5000);
> +	usleep_range(5000, 8000);
>  
>  	/* Enable reverse channel and disable the serial link. */
>  	ret = max9271_set_serial_link(&dev->serializer, false);
> 


  parent reply	other threads:[~2021-02-17 13:40 UTC|newest]

Thread overview: 65+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-16 17:41 [PATCH 00/16] media: i2c: GMSL reliability improvements Jacopo Mondi
2021-02-16 17:41 ` [PATCH 01/16] media: i2c: rdacm20: Enable noise immunity Jacopo Mondi
2021-02-17 12:55   ` Kieran Bingham
2021-02-22  0:49     ` Laurent Pinchart
2021-02-22 14:59       ` Jacopo Mondi
2021-02-24 20:35         ` Laurent Pinchart
2021-02-16 17:41 ` [PATCH 02/16] media: i2c: rdacm20: Embedded 'serializer' field Jacopo Mondi
2021-02-17 12:56   ` Kieran Bingham
2021-02-22  0:58   ` Laurent Pinchart
2021-02-16 17:41 ` [PATCH 03/16] media: i2c: rdacm20: Replace goto with a loop Jacopo Mondi
2021-02-17 13:01   ` Kieran Bingham
2021-02-22  1:05     ` Laurent Pinchart
2021-02-22 15:06       ` Jacopo Mondi
2021-02-24 20:27         ` Laurent Pinchart
2021-02-25  8:56           ` Kieran Bingham
2021-02-16 17:41 ` [PATCH 04/16] media: i2c: rdacm20: Report camera module name Jacopo Mondi
2021-02-17 13:02   ` Kieran Bingham
2021-02-22  1:06   ` Laurent Pinchart
2021-02-16 17:41 ` [PATCH 05/16] media: i2c: rdacm20: Check return values Jacopo Mondi
2021-02-17 13:08   ` Kieran Bingham
2021-02-22  1:09   ` Laurent Pinchart
2021-02-22 15:08     ` Jacopo Mondi
2021-02-16 17:41 ` [PATCH 06/16] media: i2c: rdacm20: Re-work ov10635 reset Jacopo Mondi
2021-02-17 13:22   ` Kieran Bingham
2021-02-22  1:15   ` Laurent Pinchart
2021-02-16 17:41 ` [PATCH 07/16] media: i2c: rdacm2x: Fix wake up delay Jacopo Mondi
2021-02-17  8:02   ` Geert Uytterhoeven
2021-02-17 13:33   ` Kieran Bingham [this message]
2021-02-22  1:18     ` Laurent Pinchart
2021-02-22 15:11       ` Jacopo Mondi
2021-02-24 20:29         ` Laurent Pinchart
2021-02-16 17:41 ` [PATCH 08/16] media: i2c: max9286: Adjust parameters indent Jacopo Mondi
2021-02-17 13:36   ` Kieran Bingham
2021-02-22  1:20   ` Laurent Pinchart
2021-02-16 17:41 ` [PATCH 09/16] media: i2c: rdacm21: Re-work OV10640 initialization Jacopo Mondi
2021-02-17  8:06   ` Geert Uytterhoeven
2021-02-17 13:55   ` Kieran Bingham
2021-02-22  1:27   ` Laurent Pinchart
2021-02-22 15:19     ` Jacopo Mondi
2021-02-24 20:30       ` Laurent Pinchart
2021-02-16 17:41 ` [PATCH 10/16] media: i2c: max9286: Rename reverse_channel_mv Jacopo Mondi
2021-02-17  8:07   ` Geert Uytterhoeven
2021-02-18 15:06   ` Kieran Bingham
2021-02-22  1:29   ` Laurent Pinchart
2021-02-16 17:41 ` [PATCH 11/16] media: i2c: max9286: Cache channel amplitude Jacopo Mondi
2021-02-17  8:08   ` Geert Uytterhoeven
2021-02-18 15:39   ` Kieran Bingham
2021-02-22  1:33   ` Laurent Pinchart
2021-02-16 17:41 ` [PATCH 12/16] media: i2c: max9286: Define high " Jacopo Mondi
2021-02-18 15:39   ` Kieran Bingham
2021-02-22  1:35   ` Laurent Pinchart
2021-02-16 17:41 ` [PATCH 13/16] media: i2c: rdacm2x: Implement .init() subdev op Jacopo Mondi
2021-02-17  8:17   ` Geert Uytterhoeven
2021-02-18 16:13   ` Kieran Bingham
2021-02-22  1:52     ` Laurent Pinchart
2021-02-16 17:41 ` [PATCH 14/16] media: i2c: max9286: Initialize remotes when bound Jacopo Mondi
2021-02-17  8:19   ` Geert Uytterhoeven
2021-02-18 16:00   ` Kieran Bingham
2021-02-22  2:03   ` Laurent Pinchart
2021-02-16 17:41 ` [PATCH 15/16] media: i2c: max9286: Rework comments in .bound() Jacopo Mondi
2021-02-18 16:03   ` Kieran Bingham
2021-02-16 17:41 ` [PATCH 16/16] media: i2c: gmsl: Use 339Kbps I2C bit-rate Jacopo Mondi
2021-02-17  8:19   ` Geert Uytterhoeven
2021-02-18 16:07   ` Kieran Bingham
2021-02-22  2:06     ` Laurent Pinchart

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