From patchwork Wed Aug 5 07:02:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alain Volmat X-Patchwork-Id: 11701427 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 31900722 for ; Wed, 5 Aug 2020 07:05:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1D4F522CAF for ; Wed, 5 Aug 2020 07:05:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=st.com header.i=@st.com header.b="xRxAax2h" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725983AbgHEHFT (ORCPT ); Wed, 5 Aug 2020 03:05:19 -0400 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:54406 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728328AbgHEHEe (ORCPT ); Wed, 5 Aug 2020 03:04:34 -0400 Received: from pps.filterd (m0046661.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 07573OoU002361; Wed, 5 Aug 2020 09:04:20 +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=4O6xDuO64Gg6jGP8uNW6hD+yU28rSUAsUgtFwSr6Vlo=; b=xRxAax2hiS5FQkK1SaOFGmlzFUWbvhl0fWuQlB5/kzZP0Wm4BWP/lDDT5A6cK44Tkwsg jXt01UY2GVIGGyfSYpHzTzVfko8pHhcQ0ySf37GBK2M3KNGscaHgVacekAbr3vrJH13b rx/RX06xZku8q+/YD0HMNhqs4+oPiLZVq928QQLYbP5yRolC6G7ub/gQ5OS3NAteT3SK sO29YOfJqMWEnXarADLpEqbfftlR9y4oubAHyDlBEUp3X7iYgk+SazcvqB95zjeK/086 vwhzFnkJQWaJyedpGai5Qju4XcO31EQyuuIZWg6zl8nQF3ZHKsh/4eMqWHfCqt9Lk1WX Eg== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 32n6knf7e5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 05 Aug 2020 09:04:20 +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 B796110002A; Wed, 5 Aug 2020 09:04:19 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag3node2.st.com [10.75.127.8]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id AC9FD2A4D8E; Wed, 5 Aug 2020 09:04:19 +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; Wed, 5 Aug 2020 09:04:19 +0200 From: Alain Volmat To: , CC: , , , , , , , Subject: [PATCH 15/18] spi: stm32: fix stm32_spi_prepare_mbr in case of odd clk_rate Date: Wed, 5 Aug 2020 09:02:10 +0200 Message-ID: <1596610933-32599-16-git-send-email-alain.volmat@st.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1596610933-32599-1-git-send-email-alain.volmat@st.com> References: <1596610933-32599-1-git-send-email-alain.volmat@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.49] X-ClientProxiedBy: SFHDAG3NODE2.st.com (10.75.127.8) 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=2020-08-05_04:2020-08-03,2020-08-05 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 0aec32538093..2665d8d7f318 100644 --- a/drivers/spi/spi-stm32.c +++ b/drivers/spi/spi-stm32.c @@ -436,7 +436,8 @@ 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