linux-kernel - Re: [PATCH 2/4] media: i2c: ov2685: Add print for power on write failed

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Message-ID: <20230129112413.vrlcwkdujvl2msex@uno.localdomain>
Date:   Sun, 29 Jan 2023 12:24:13 +0100
From:   Jacopo Mondi <jacopo.mondi@...asonboard.com>
To:     Luca Weiss <luca@...tu.xyz>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Shunqian Zheng <zhengsq@...k-chips.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Jacopo Mondi <jacopo.mondi@...asonboard.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] media: i2c: ov2685: Add print for power on write
 failed

Hi Luca

On Sun, Jan 29, 2023 at 10:42:36AM +0100, Luca Weiss wrote:
> If the sensor doens't power up correctly, for example due to incorrect
> devicetree description, the power up i2c writes will fail.
>
> Add an error print for this situation.
>
> Signed-off-by: Luca Weiss <luca@...tu.xyz>
> ---
>  drivers/media/i2c/ov2685.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/i2c/ov2685.c b/drivers/media/i2c/ov2685.c
> index a422f4c8a2eb..844a91dbc8e5 100644
> --- a/drivers/media/i2c/ov2685.c
> +++ b/drivers/media/i2c/ov2685.c
> @@ -419,8 +419,10 @@ static int __ov2685_power_on(struct ov2685 *ov2685)
>  	 * writing register before .s_stream() as a workaround
>  	 */
>  	ret = ov2685_write_array(ov2685->client, ov2685->cur_mode->reg_list);
> -	if (ret)
> +	if (ret) {
> +		dev_err(dev, "Failed to set regs for power on\n");
>  		goto disable_supplies;
> +	}

This is fine. I would also consider if it's worth to fail loud in
ov2685_write_reg().

Reviewed-by: Jacopo Mondi <jacopo.mondi@...asonboard.com>
>
>  	return 0;
>
>
> --
> 2.39.1
>