From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A4734C433E0 for ; Wed, 17 Feb 2021 08:13:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6565664DE9 for ; Wed, 17 Feb 2021 08:13:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232068AbhBQIMz (ORCPT ); Wed, 17 Feb 2021 03:12:55 -0500 Received: from mail-oi1-f182.google.com ([209.85.167.182]:41731 "EHLO mail-oi1-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231883AbhBQIHZ (ORCPT ); Wed, 17 Feb 2021 03:07:25 -0500 Received: by mail-oi1-f182.google.com with SMTP id v193so14106738oie.8; Wed, 17 Feb 2021 00:07:05 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=o6A4tdaKh5y2j4m9oXG0FiniGXLjw0wwg2ak9qpEZb0=; b=AR5BV5l6Pb9UnavBX+SaCB+I26Zc3/2C6Sm2WrHOHcnXTxOwzTONxejETLxNTpoSsD vSGTCrfT/9gz+yALY6MgQrGEQ7rt6hhWgbkxHEHHvK0mais/hRlagS2naoaOZosueLIb f4PI2ieSX70BNjVpJF2iFKH/8Sfk0kLjZ2xr8ucPNlCrUbnZfGR+m4BPUx/w+i9SOeLd MyGXEMBn4myw4NgtWyuIjhypoeaf+o/ScI12a2k1MjjMtX++/q3N8s0TDmoJrfSPONlb WSaFnfmkW1FdZXK26uj+TVMKzw7zFckQBSxnQf2YMgJ6UhySCPykCP5Q2g9wU+OlFUTx Gn0A== X-Gm-Message-State: AOAM533PFob99QE2Wuc6FNax/GnxGA4XPry+JlOpYAbWOpZJd2CZNrBO lvFV413JB0JEMIBBmYhtzNkXl4bFq5lPlFhjkBw= X-Google-Smtp-Source: ABdhPJywMV7acX5qz1G997cfR1R7vSZD5sxPbhFkJgwGWh77jEPv5pM4Xu9FulQERCbcaSBj6IzzjHNrdlcGRxQIqXM= X-Received: by 2002:aca:d908:: with SMTP id q8mr2352692oig.148.1613549199859; Wed, 17 Feb 2021 00:06:39 -0800 (PST) MIME-Version: 1.0 References: <20210216174146.106639-1-jacopo+renesas@jmondi.org> <20210216174146.106639-10-jacopo+renesas@jmondi.org> In-Reply-To: <20210216174146.106639-10-jacopo+renesas@jmondi.org> From: Geert Uytterhoeven Date: Wed, 17 Feb 2021 09:06:28 +0100 Message-ID: Subject: Re: [PATCH 09/16] media: i2c: rdacm21: Re-work OV10640 initialization To: Jacopo Mondi Cc: Kieran Bingham , Laurent Pinchart , =?UTF-8?Q?Niklas_S=C3=B6derlund?= , Mauro Carvalho Chehab , Linux Media Mailing List , Linux-Renesas , Linux Kernel Mailing List Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Jacopo, On Tue, Feb 16, 2021 at 6:41 PM Jacopo Mondi 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@linux-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