From patchwork Fri Dec 8 17:41:49 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Stefan_Br=C3=BCns?= X-Patchwork-Id: 10103065 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 41CB560329 for ; Fri, 8 Dec 2017 17:42:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 28BEF28E4F for ; Fri, 8 Dec 2017 17:42:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1D85228E55; Fri, 8 Dec 2017 17:42:22 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B5F6728E5D for ; Fri, 8 Dec 2017 17:42:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752605AbdLHRmT (ORCPT ); Fri, 8 Dec 2017 12:42:19 -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" Received: from rwthex-w2-a.rwth-ad.de ([134.130.26.158]) by mail-in-2.itc.rwth-aachen.de with ESMTP; 08 Dec 2017 18:42:06 +0100 Received: from pebbles.fritz.box (78.48.176.14) by rwthex-w2-a.rwth-ad.de (2002:8682:1a9e::8682:1a9e) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1034.26; Fri, 8 Dec 2017 18:42:02 +0100 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 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-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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());