Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755191AbdLUScS (ORCPT ); Thu, 21 Dec 2017 13:32:18 -0500 Received: from mail-out-2.itc.rwth-aachen.de ([134.130.5.47]:18819 "EHLO mail-out-2.itc.rwth-aachen.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753199AbdLUSb4 (ORCPT ); Thu, 21 Dec 2017 13:31:56 -0500 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A2AaBgB8/Tta/54agoZbHAEBAQQBAQoBA?= =?us-ascii?q?YM+ggEHg3+ZNJs/CoU7AoRKQxQBAQEBAQEBAQFrKIUkBiMPAUYQJQImAgJXBg4?= =?us-ascii?q?FiisEpESCJ4hTghwBAQEBBgEBAQEBIwkBgQWCcIISg2iGNYI6gg4MMYJlBaNIg?= =?us-ascii?q?ROgL4dnllICAgICCQIagTs2IoFPcIJ5glQcgWh3iQEBgRUBAQE?= X-IPAS-Result: =?us-ascii?q?A2AaBgB8/Tta/54agoZbHAEBAQQBAQoBAYM+ggEHg3+ZNJs?= =?us-ascii?q?/CoU7AoRKQxQBAQEBAQEBAQFrKIUkBiMPAUYQJQImAgJXBg4FiisEpESCJ4hTg?= =?us-ascii?q?hwBAQEBBgEBAQEBIwkBgQWCcIISg2iGNYI6gg4MMYJlBaNIgROgL4dnllICAgI?= =?us-ascii?q?CCQIagTs2IoFPcIJ5glQcgWh3iQEBgRUBAQE?= X-IronPort-AV: E=Sophos;i="5.45,437,1508796000"; d="scan'208";a="30601181" From: =?UTF-8?q?Stefan=20Br=C3=BCns?= To: CC: Peter Meerwald-Stadler , =?UTF-8?q?Stefan=20Br=C3=BCns?= , Maciej Purski , , "Andrew F . Davis" , Lars-Peter Clausen , Jonathan Cameron , Hartmut Knaack Subject: [PATCH v2 4/7] iio: adc: ina2xx: Do not udelay for several seconds Date: Thu, 21 Dec 2017 19:31:35 +0100 X-Mailer: git-send-email 2.15.1 In-Reply-To: <20171221183138.361-1-stefan.bruens@rwth-aachen.de> References: <20171221183138.361-1-stefan.bruens@rwth-aachen.de> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-Originating-IP: [92.228.148.100] X-ClientProxiedBy: rwthex-s1-a.rwth-ad.de (2002:8682:1a98::8682:1a98) To rwthex-w2-a.rwth-ad.de (2002:8682:1a9e::8682:1a9e) Message-ID: <3cf0575b-0b74-4c9e-b7be-a044b2245ff3@rwthex-w2-a.rwth-ad.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1129 Lines: 39 The conversion time can be up to 16 seconds (8 ms per channel, 2 channels, 1024 times averaging). Signed-off-by: Stefan Brüns --- Changes in v2: None drivers/iio/adc/ina2xx-adc.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c index b027d485398b..2621a34ee5c6 100644 --- a/drivers/iio/adc/ina2xx-adc.c +++ b/drivers/iio/adc/ina2xx-adc.c @@ -764,7 +764,7 @@ static int ina2xx_capture_thread(void *data) struct iio_dev *indio_dev = data; struct ina2xx_chip_info *chip = iio_priv(indio_dev); int sampling_us = SAMPLING_PERIOD(chip); - int buffer_us; + int buffer_us, delay_us; /* * Poll a bit faster than the chip internal Fs, in case @@ -778,8 +778,10 @@ static int ina2xx_capture_thread(void *data) if (buffer_us < 0) return buffer_us; - if (sampling_us > buffer_us) - udelay(sampling_us - buffer_us); + if (sampling_us > buffer_us) { + delay_us = sampling_us - buffer_us; + usleep_range(delay_us, (delay_us * 3) >> 1); + } } while (!kthread_should_stop()); -- 2.15.1