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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4695AC4167B for ; Mon, 12 Dec 2022 02:59:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230511AbiLLC7Y (ORCPT ); Sun, 11 Dec 2022 21:59:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52164 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230503AbiLLC7X (ORCPT ); Sun, 11 Dec 2022 21:59:23 -0500 Received: from mail-pg1-x529.google.com (mail-pg1-x529.google.com [IPv6:2607:f8b0:4864:20::529]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8368AB7EC for ; Sun, 11 Dec 2022 18:59:22 -0800 (PST) Received: by mail-pg1-x529.google.com with SMTP id 142so7282595pga.1 for ; Sun, 11 Dec 2022 18:59:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=ghZng+o7vrNyoICK5o/wsHSFT0RaK0uhwurbgOlYZ8s=; b=MNSTJDVIVxo8AXBGEODjmtGRSGD2BlQ4HuNV5cV9ODJWFRmnm6F4CdDm8CieM5D3zy CI7Qj+FRQBypRJDU/3wEH2yrpyHvM4yQettEuiVwMHGTYlxYSpJoyNbLGG3lXt8Dqe8R j0lBUUS+QXjfomft7MQnsT+VIAzmjnZ0rLn7s= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=ghZng+o7vrNyoICK5o/wsHSFT0RaK0uhwurbgOlYZ8s=; b=shGNYsWUSJz2eo34OeIQIhcD5w05EjpK9jtaVnU1sij8q9Ys1XnYuwL7e9mjaqTAvE uQQNymLQlGNSsa8oMtQv+IgL/VH9l2ar0h9sjhz3HdeV2OsP41+OlhO7bhJRwewfxOkF n2PT8kKj3o3kpDHQWgCQmm9Y/dzDF9TsqIIOFk28OHKg6THWmaORFz4shsAd34CO2P0r 8JoVA+2daUVW/g0ZeorI/Aoh01YmAiAS27y249kmfRE3l1MmY+KLlnynMZ7qC9X20tai xxRkxFlUD1XOIM8fgIz0zq00XJw/S5N+mGTJduk50Fy7hFfC2x/UIOUDm7P2dFTQiRLp Ucsg== X-Gm-Message-State: ANoB5pkv5RB0HqWYN9hwQGPVWWD+aX8PRMZx9b5nH+mtDZLAjhlkjynZ MpAgTyczrKd+s/2iof9TMmoPVg== X-Google-Smtp-Source: AA0mqf45/p+n2cziOEfpI9VnZ1uCMCBZJoBKEWaWDHXt1AYgzZmqWsa/VO/v8T9hwOrOi+xmZ/HQ5A== X-Received: by 2002:a62:7b97:0:b0:577:151d:122e with SMTP id w145-20020a627b97000000b00577151d122emr15229565pfc.18.1670813962038; Sun, 11 Dec 2022 18:59:22 -0800 (PST) Received: from google.com (KD124209188001.ppp-bb.dion.ne.jp. [124.209.188.1]) by smtp.gmail.com with ESMTPSA id 69-20020a621648000000b0057630286100sm4591381pfw.164.2022.12.11.18.59.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 11 Dec 2022 18:59:21 -0800 (PST) Date: Mon, 12 Dec 2022 11:59:16 +0900 From: Sergey Senozhatsky To: Ricardo Ribalda Cc: Mauro Carvalho Chehab , Guenter Roeck , Tomasz Figa , Alan Stern , linux-kernel@vger.kernel.org, Max Staudt , Sergey Senozhatsky , Yunke Cao , Laurent Pinchart , Hans Verkuil , linux-media@vger.kernel.org Subject: Re: [PATCH v5 2/2] media: uvcvideo: Do power management granularly Message-ID: References: <20220920-resend-powersave-v5-0-692e6df6c1e2@chromium.org> <20220920-resend-powersave-v5-2-692e6df6c1e2@chromium.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220920-resend-powersave-v5-2-692e6df6c1e2@chromium.org> Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org On (22/12/06 15:06), Ricardo Ribalda wrote: > > Instead of suspending/resume the USB device at open()/close(), do it > when the device is actually used. > > This way we can reduce the power consumption when a service is holding > the video device and leaving it in an idle state. > > Reviewed-by: Tomasz Figa > Reviewed-by: Max Staudt > Signed-off-by: Ricardo Ribalda Reviewed-by: Sergey Senozhatsky