From patchwork Fri Sep 2 15:41:45 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Seidel X-Patchwork-Id: 9311207 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 DFC32607D2 for ; Fri, 2 Sep 2016 15:41:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D19F0297CD for ; Fri, 2 Sep 2016 15:41:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C631C297D6; Fri, 2 Sep 2016 15:41:48 +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=-5.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI, RCVD_IN_SORBS_SPAM, T_DKIM_INVALID 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 67269297DE for ; Fri, 2 Sep 2016 15:41:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932302AbcIBPlr (ORCPT ); Fri, 2 Sep 2016 11:41:47 -0400 Received: from mail-wm0-f66.google.com ([74.125.82.66]:34467 "EHLO mail-wm0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932282AbcIBPlq (ORCPT ); Fri, 2 Sep 2016 11:41:46 -0400 Received: by mail-wm0-f66.google.com with SMTP id v143so3339041wmv.1 for ; Fri, 02 Sep 2016 08:41:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mseidel-net.20150623.gappssmtp.com; s=20150623; h=sender:to:from:subject:message-id:date:user-agent:mime-version :content-transfer-encoding; bh=1ZPgv84aPXJvPUuQWCvUlpdrfgEMG2CfbLDe5tH7nqQ=; b=arkQ/VmMT7dsRgCsNkDpXV/ydvjg9Tx3DDi9xSFaxc0LepJxuoH4YxZDe1BM6WI1zM /JUu4HZk8Bao2S9vLDjAV83o8lX8Jgzz6wyIvS2YUK68S/jFRL56fL4ucLrFBBSG6yNr HJbJT3jxkGTuzcrnalbnX51nwP+tFelGfAP3u7h2iDkrEeqftGUN7b3CITphsm4pxI68 OvFEpmdyO17HtZ8wrU6L0BUln2fEL/vulkWBST1vE4nZBGMkGHIRCz9YZcDemaz3g5G4 N+uv5ueRYeyeSj+wnjXg7x9yiDKC58CZzebF7mYtDsrsb5SHaHXvrHpZAbOlMRfY40c8 IpKw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:sender:to:from:subject:message-id:date :user-agent:mime-version:content-transfer-encoding; bh=1ZPgv84aPXJvPUuQWCvUlpdrfgEMG2CfbLDe5tH7nqQ=; b=OgE3CUdRDDDg/z2Z4tZTtodJrHONhxMJJKhWrr1npEMq7Php5nPtx9MLWS9rpTCUr3 ir56bM0pFWTqbCesC+aM1B9Y88Y9oiw3oSsXS7IeGd4pSBlOAATQBJTgPu9qfh9RKnHa oDX0mK9ldQhy0EyI3dsvCE0X4KBDTuDimX21ZdYBQW7PO+V7hvrip5RsNuQdrAXAvzkH xUJvUhDQ2ujkM8gnbWq28iQnUhw34IYBdmE70nJhivdD7TYff8lT+mT/tercXJE2SERq XkDwsTM2LGAKD9bbIEvClb4DjHYvlu/cXTp7g0A7RIh1IXFw+j54dn9BM8RrZkWiXSAc FZCg== X-Gm-Message-State: AE9vXwPEGITDFdCN0eCF7PpBsuRci9/6B9tFCS4nn6IIjSbuQYeo/0kqr9KNZv+nvNIuhA== X-Received: by 10.28.185.202 with SMTP id j193mr3810450wmf.78.1472830904579; Fri, 02 Sep 2016 08:41:44 -0700 (PDT) Received: from [192.168.1.101] (ip-109-91-124-173.hsi12.unitymediagroup.de. [109.91.124.173]) by smtp.gmail.com with ESMTPSA id n7sm11030029wjf.11.2016.09.02.08.41.43 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 02 Sep 2016 08:41:44 -0700 (PDT) To: Mark Brown , linux-spi@vger.kernel.org From: Matthias Seidel Subject: [PATCH 2/2] spi: dw: round up result of calculation for clock divider Message-ID: <457c5375-38b3-9c36-76a3-a43321aa687b@mseidel.net> Date: Fri, 2 Sep 2016 17:41:45 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0 MIME-Version: 1.0 Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP avoid ending up with a higher frequency than requested --- drivers/spi/spi-dw.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c index c85e4b3..2fd517d 100644 --- a/drivers/spi/spi-dw.c +++ b/drivers/spi/spi-dw.c @@ -300,7 +300,8 @@ static int dw_spi_transfer_one(struct spi_master *master, if (transfer->speed_hz != dws->current_freq) { if (transfer->speed_hz != chip->speed_hz) { /* clk_div doesn't support odd number */ - chip->clk_div = (dws->max_freq / transfer->speed_hz + 1) & 0xfffe; + chip->clk_div = ((dws->max_freq + transfer->speed_hz) / + transfer->speed_hz + 1) & 0xfffe; chip->speed_hz = transfer->speed_hz; } dws->current_freq = transfer->speed_hz;