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=-5.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 E4E54C433E0 for ; Wed, 5 Aug 2020 17:41:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BCF272073E for ; Wed, 5 Aug 2020 17:41:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="iBRKOMud" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728875AbgHERjo (ORCPT ); Wed, 5 Aug 2020 13:39:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54278 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728913AbgHERe0 (ORCPT ); Wed, 5 Aug 2020 13:34:26 -0400 Received: from mail-lf1-x142.google.com (mail-lf1-x142.google.com [IPv6:2a00:1450:4864:20::142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6BE49C061575; Wed, 5 Aug 2020 10:34:25 -0700 (PDT) Received: by mail-lf1-x142.google.com with SMTP id m15so24027311lfp.7; Wed, 05 Aug 2020 10:34:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=8HNwuenZ8HVoSfRFM1yr+yhY+DsPUgYL0/MOa8/jpuw=; b=iBRKOMudr0THs5hTgteotC5bRZ/66USrPw3+qrK/dEZs9FSP5eKITva6gk0ucJ7i4L AFAb35yJ8hLuKDaybk/amuGvLAWCnXCxxaZHsxIb5cXpjtVb0GdKhh1hskI8yinJFElG eYNS1JXAFbdDNPRZ5GmEWrKB+8UQTZxbhkbNac9zlFe59Az0VOs1x/cuHuleDVe6COhB 5IuVxYNH58/w6iQxy7x1pM7VMxGRRwnGIqyfC/4GiEwgvTUlwVUPdjBtEZ7zeUlcq3rr DqHAzIdW3RCIZbFc538fnJYC/e/HOcxmjc/B2SBMMhnPHXhOx3OF+w9bG5VZci7DQTK5 VbTQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=8HNwuenZ8HVoSfRFM1yr+yhY+DsPUgYL0/MOa8/jpuw=; b=Q8KbsW9YIsaj6bO4gjFitCy/Wpae9wFTt3tHhdjEegLW8wGz1yEsWN7i1Rd+kW0ujf LfsvfP2VL3W5oQKWiHInhBSeOMFJgFeNLo/K7c/R8osPiA1NKECC01TQYaICyWYkRM32 oXdLcmf2g0Ww3PiguhWpVpQeLLgXOqfuFDUTcdD8JF26oNZuod51Qt+TA68mmBMmusZ1 mJHYgkySgof8v9c6v2Suu+4FWhVd4advmq5rwF4oO+jTkXtcDgVP5ZUJu9mLNzxXKt1X 4+inyx/bSs6bsiS/IjVGlTFyYAk5Nckm9BAHQya7y04fXXKKEj2zzC/sj+4WdJcX2xqk kfEw== X-Gm-Message-State: AOAM533oNEW16+OLEHMjZMe2AG0cdNN8vljxnWebtggK2Y+Ozs8MO5hY xRSzGna+3ogPIUAeod68mrDKaISk X-Google-Smtp-Source: ABdhPJyjhk8Q6HUt9Yu+pqu8UnN5oD9llj148EBGwcEGKoESer4YRNK3ivBgN2/rmEQSpgxbLQ812w== X-Received: by 2002:a05:6512:1182:: with SMTP id g2mr2081022lfr.126.1596648863749; Wed, 05 Aug 2020 10:34:23 -0700 (PDT) Received: from [192.168.2.145] (94-29-41-50.dynamic.spd-mgts.ru. [94.29.41.50]) by smtp.googlemail.com with ESMTPSA id x6sm1370280lff.64.2020.08.05.10.34.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 05 Aug 2020 10:34:23 -0700 (PDT) Subject: Re: [PATCH v8 08/10] gpu: host1x: mipi: Keep MIPI clock enabled till calibration is done To: Sowjanya Komatineni , Thierry Reding Cc: jonathanh@nvidia.com, frankc@nvidia.com, hverkuil@xs4all.nl, sakari.ailus@iki.fi, robh+dt@kernel.org, helen.koike@collabora.com, gregkh@linuxfoundation.org, linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org References: <1596469346-937-1-git-send-email-skomatineni@nvidia.com> <1596469346-937-9-git-send-email-skomatineni@nvidia.com> <20200805134600.GA3351349@ulmo> <103efe31-1abc-54f2-6004-490d7bb1b61a@gmail.com> <6eede805-80fd-016f-22f8-b6d25f6587af@nvidia.com> <1c12e40e-de7f-0599-a941-82760b4c7668@gmail.com> <9ef0b875-e826-43e2-207e-168d2081ff6a@nvidia.com> <4689cfe9-e7c4-48bf-217f-3a31b59b8bda@nvidia.com> From: Dmitry Osipenko Message-ID: <0e78c5ca-c529-1e98-891d-30351c9aae81@gmail.com> Date: Wed, 5 Aug 2020 20:34:22 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <4689cfe9-e7c4-48bf-217f-3a31b59b8bda@nvidia.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org 05.08.2020 20:29, Sowjanya Komatineni пишет: ... > UART_FST_MIPI_CAL is the clock used for calibration logic which is FSM > that goes thru sequence codes and when done waits for pads to be in > LP-11 to apply results. > > MIPI_CLK is controller gate clock which is also need to be kept enabled > as incase if it sees LP-11 it updates registers so its recommended to > have this clock enabled. > > We can cancel_calibration() in CSI only when csi/sensor stream on fails > and in which case there will be no LP-11 so we can unconditionally > disable MIPI_CLK. > There is no guarantee that the fail comes before the LP-11. For example, some odd camera driver may have a complicated enable sequence which may fail after enabling the hardware streaming.