Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753251AbdLHRmW (ORCPT ); Fri, 8 Dec 2017 12:42:22 -0500 Received: from mail-out-2.itc.rwth-aachen.de ([134.130.5.47]:42278 "EHLO mail-out-2.itc.rwth-aachen.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752003AbdLHRmL (ORCPT ); Fri, 8 Dec 2017 12:42:11 -0500 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A2CKBQDbzSpa/54agoZcHAEBAQQBAQoBA?= =?us-ascii?q?YM+ggEHg3uZIYFXmUcKhTsChF9DFAEBAQEBAQEBAWsohSMGIw8BRhAlAiYCAlc?= =?us-ascii?q?GDgWKKASoLoIniEmCGgEBAQEGAQEBAQEjCQGBBYJMgguDaAuIYoJJgmMFowiBE?= =?us-ascii?q?JQSjAiHV5YvAgICAgkCGoE7NiKBT3CCd4JSHIFod4khAYEUAQEB?= X-IPAS-Result: =?us-ascii?q?A2CKBQDbzSpa/54agoZcHAEBAQQBAQoBAYM+ggEHg3uZIYF?= =?us-ascii?q?XmUcKhTsChF9DFAEBAQEBAQEBAWsohSMGIw8BRhAlAiYCAlcGDgWKKASoLoIni?= =?us-ascii?q?EmCGgEBAQEGAQEBAQEjCQGBBYJMgguDaAuIYoJJgmMFowiBEJQSjAiHV5YvAgI?= =?us-ascii?q?CAgkCGoE7NiKBT3CCd4JSHIFod4khAYEUAQEB?= X-IronPort-AV: E=Sophos;i="5.45,378,1508796000"; d="scan'208";a="28277013" 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 , "Javier Martinez Canillas" Subject: [PATCH v1 4/7] iio: adc: ina2xx: Do not udelay for several seconds Date: Fri, 8 Dec 2017 18:41:49 +0100 X-Mailer: git-send-email 2.15.1 In-Reply-To: <20171208174152.30341-1-stefan.bruens@rwth-aachen.de> References: <20171208174152.30341-1-stefan.bruens@rwth-aachen.de> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-Originating-IP: [78.48.176.14] X-ClientProxiedBy: rwthex-w3-a.rwth-ad.de (2002:8682:1aa2::8682:1aa2) To rwthex-w2-a.rwth-ad.de (2002:8682:1a9e::8682:1a9e) Message-ID: <44807977-8b46-4678-b8e5-440ff8208062@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: 1108 Lines: 37 The conversion time can be up to 16 seconds (8 ms per channel, 2 channels, 1024 times averaging). Signed-off-by: Stefan Brüns --- 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