From patchwork Fri Aug 7 13:21:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alain Volmat X-Patchwork-Id: 11705719 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5A388618 for ; Fri, 7 Aug 2020 13:23:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 378DF2086A for ; Fri, 7 Aug 2020 13:23:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=st.com header.i=@st.com header.b="Id8fuN7o" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726166AbgHGNXx (ORCPT ); Fri, 7 Aug 2020 09:23:53 -0400 Received: from mx07-00178001.pphosted.com ([185.132.182.106]:51547 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726038AbgHGNXq (ORCPT ); Fri, 7 Aug 2020 09:23:46 -0400 Received: from pps.filterd (m0046668.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 077DNYS8017470; Fri, 7 Aug 2020 15:23:34 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=STMicroelectronics; bh=8KY3DUWhOx3j5psTHwxct4R3LIN5BrLRCFHnkI+96So=; b=Id8fuN7oOhRfvfrLc0nnjckuI+n++DmOsg3s+p5GwEvy4qnYafEgo5G20K+Hve/q4AT8 C2t14JjxbvdY/QC2FK9EswsiPnmlJOLmLPpuEjJAtggYgxW+jpu49oU21wyT22Inzxi6 YjZ7zVix378jjpUIa5uAGc+9tAqbPAwc3T6VIgmY4YHB8U0M0Cevqe/EGyIpHtKwrcOK b/MsY9vhOKMQFfyx/tNZoh86qU1MDyLgB9fh3dnnPuAyLoavD5ZDw3I93SYzl+Yf932G 3GZ5QJuU3aCOl4izRAr8FtXwFwvDYTZI8KMLTUj+xh9RkFVExPUE8UxKGA4FQ8P3TB10 Lg== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 32n6thsxsd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 07 Aug 2020 15:23:34 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id E90FE10002A; Fri, 7 Aug 2020 15:23:30 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag3node2.st.com [10.75.127.8]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id DF8C12B8A02; Fri, 7 Aug 2020 15:23:30 +0200 (CEST) Received: from localhost (10.75.127.49) by SFHDAG3NODE2.st.com (10.75.127.8) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Fri, 7 Aug 2020 15:23:30 +0200 From: Alain Volmat To: , CC: , , , , , , , Subject: [PATCH 3/5] spi: stm32: fix stm32_spi_prepare_mbr in case of odd clk_rate Date: Fri, 7 Aug 2020 15:21:23 +0200 Message-ID: <1596806485-3810-4-git-send-email-alain.volmat@st.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1596806485-3810-1-git-send-email-alain.volmat@st.com> References: <1596806485-3810-1-git-send-email-alain.volmat@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.49] X-ClientProxiedBy: SFHDAG8NODE1.st.com (10.75.127.22) To SFHDAG3NODE2.st.com (10.75.127.8) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-08-07_09:2020-08-06,2020-08-07 signatures=0 Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org From: Amelie Delaunay Fix spi->clk_rate when it is odd to the nearest lowest even value because minimum SPI divider is 2. Signed-off-by: Amelie Delaunay Signed-off-by: Alain Volmat --- drivers/spi/spi-stm32.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c index 005bc16bdf2a..bdd4e70c3f10 100644 --- a/drivers/spi/spi-stm32.c +++ b/drivers/spi/spi-stm32.c @@ -441,7 +441,8 @@ static int stm32_spi_prepare_mbr(struct stm32_spi *spi, u32 speed_hz, { u32 div, mbrdiv; - div = DIV_ROUND_UP(spi->clk_rate, speed_hz); + /* Ensure spi->clk_rate is even */ + div = DIV_ROUND_UP(spi->clk_rate & ~0x1, speed_hz); /* * SPI framework set xfer->speed_hz to master->max_speed_hz if