linux-kernel - Re: [PATCH 09/16] media: i2c: rdacm21: Re-work OV10640 initialization

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Message-ID: <CAMuHMdXqr_hZb0YuQ4U8doBUBqaSzjgMtU_8XB80Vg0gKd=2qw@mail.gmail.com>
Date:   Wed, 17 Feb 2021 09:06:28 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Jacopo Mondi <jacopo+renesas@...ndi.org>
Cc:     Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 09/16] media: i2c: rdacm21: Re-work OV10640 initialization

Hi Jacopo,

On Tue, Feb 16, 2021 at 6:41 PM Jacopo Mondi <jacopo+renesas@...ndi.org> wrote:
> The OV10640 image sensor reset and powerdown on signals are controlled

Drop the "on"?

> by the embedded OV490 ISP. The current reset procedure does not respect
> the 1 millisecond power-up delay and releases the reset signal before
> the powerdown one.
>
> Fix the OV10640 power up sequence by releasing the powerdown signal,
> waiting the mandatory 1 millisecond power up delay and then releasing

"powerdown" vs. "power-up" vs. "power up"?

> the reset signal. The reset delay is not characterized in the chip
> manual if not as "255 XVCLK + initialization". Wait for at least 3
> milliseconds to guarantee the SCCB bus is available.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds