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[23.128.96.18]) by mx.google.com with ESMTP id j7si876818ejm.538.2020.09.01.09.02.46; Tue, 01 Sep 2020 09:03:09 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=XjFnaTJZ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=chromium.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731734AbgIAQCT (ORCPT + 99 others); Tue, 1 Sep 2020 12:02:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56288 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731693AbgIAPns (ORCPT ); Tue, 1 Sep 2020 11:43:48 -0400 Received: from mail-pg1-x543.google.com (mail-pg1-x543.google.com [IPv6:2607:f8b0:4864:20::543]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7511DC061244 for ; Tue, 1 Sep 2020 08:43:48 -0700 (PDT) Received: by mail-pg1-x543.google.com with SMTP id l191so878331pgd.5 for ; Tue, 01 Sep 2020 08:43:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=mime-version:content-transfer-encoding:in-reply-to:references :subject:from:cc:to:date:message-id:user-agent; bh=x8Z9wFHU5eJIz7vYKW4wsTnm7g9XBK4yOanCvKB9vjM=; b=XjFnaTJZmA5aVtH7IjnlxheI47kFzEJ4agCy9CFsFrJocEXppx1FX7tJFIC+Nsvz5C iZskAozotXH0nF+KDwZpSo5ugtemrAbisn6hO6tSABZhue9FEmxd7W++zZ+KWuP5C8V2 z5x5QUtioFI85El89P/Hqu0++DQotdobhbtGo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:content-transfer-encoding :in-reply-to:references:subject:from:cc:to:date:message-id :user-agent; bh=x8Z9wFHU5eJIz7vYKW4wsTnm7g9XBK4yOanCvKB9vjM=; b=fbxK97cEBsjL+rHwixmpB34QVQ1Dk0HjZT5JHFUW/2U7VmALfD4BXCu9GQmWRhoadl evmVdVn87doVmafEvvJj++PKw4bEqcLa/mAQOvLGZRpTF3U3+Wrn0LdFzC8wcZdJSsKU TVddZOUagOF4gY2OKk+adk7b8+OxpAuWIH8vTUpkpJaqs4QPBBrFPA5jsiAhoPULKQP9 w07UfuTqXGQe2+hHQlAhuGfGT6QTpN5/mLAFSF6WOS8WhZN1H/qaBzNSFI83p9IsUdrv I5vnEkPtm9q+vho6cEOtrRseS9Weh8fyAUWNjr+iesogoYx1Yqi7Da9uIO6EWMg1HCYu V/0g== X-Gm-Message-State: AOAM531Gce8hcjhC9iG58f267q0LyAtbJH+bFJZLvGSQd/096fSbQwe/ w7qhwAX5t6sw8hXleFVLZvtyfA== X-Received: by 2002:aa7:9598:: with SMTP id z24mr2336329pfj.223.1598975028043; Tue, 01 Sep 2020 08:43:48 -0700 (PDT) Received: from chromium.org ([2620:15c:202:1:3e52:82ff:fe6c:83ab]) by smtp.gmail.com with ESMTPSA id s68sm2421932pfb.91.2020.09.01.08.43.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Sep 2020 08:43:47 -0700 (PDT) Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable In-Reply-To: <20200901081920.v2.1.Id02b2f451b3eed71ddd580f4b8b44b3e33e84970@changeid> References: <20200901081920.v2.1.Id02b2f451b3eed71ddd580f4b8b44b3e33e84970@changeid> Subject: Re: [PATCH v2] iio: sx9310: Prefer async probe From: Stephen Boyd Cc: Douglas Anderson , Alexandru Ardelean , Andy Shevchenko , Daniel Campello , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org To: Douglas Anderson , Jonathan Cameron Date: Tue, 01 Sep 2020 08:43:46 -0700 Message-ID: <159897502625.334488.7103007623601336114@swboyd.mtv.corp.google.com> User-Agent: alot/0.9.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Quoting Douglas Anderson (2020-09-01 08:19:43) > On one board I found that: > probe of 5-0028 returned 1 after 259547 usecs >=20 > While some of this time is attributable to the pile of i2c transfers > that we do at probe time, the lion's share (over 200 ms) is sitting > waiting in the polling loop in sx9310_init_compensation() waiting for > the hardware to indicate that it's done. >=20 > There's no reason to block probe of all other devices on our probe. > Turn on async probe. >=20 > Signed-off-by: Douglas Anderson > --- Reviewed-by: Stephen Boyd