From patchwork Wed Jul 29 14:14:51 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 6894461 Return-Path: X-Original-To: patchwork-linux-spi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 464BEC05AC for ; Wed, 29 Jul 2015 14:15:34 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 6220B20592 for ; Wed, 29 Jul 2015 14:15:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 61EA0204FF for ; Wed, 29 Jul 2015 14:15:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754361AbbG2OPb (ORCPT ); Wed, 29 Jul 2015 10:15:31 -0400 Received: from mezzanine.sirena.org.uk ([106.187.55.193]:45325 "EHLO mezzanine.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754364AbbG2OPN (ORCPT ); Wed, 29 Jul 2015 10:15:13 -0400 Received: from 35.193.198.146.dyn.plus.net ([146.198.193.35] helo=finisterre) by mezzanine.sirena.org.uk with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1ZKS8J-0005r1-Py; Wed, 29 Jul 2015 14:15:01 +0000 Received: from broonie by finisterre with local (Exim 4.86_RC4) (envelope-from ) id 1ZKS8B-0004nj-7g; Wed, 29 Jul 2015 15:14:51 +0100 From: Mark Brown To: Noralf Tronnes , Martin Sperl , Mark Brown Cc: linux-spi@vger.kernel.org In-Reply-To: <1438155250-14476-1-git-send-email-kernel@martin.sperl.org> Message-Id: Date: Wed, 29 Jul 2015 15:14:51 +0100 X-SA-Exim-Connect-IP: 146.198.193.35 X-SA-Exim-Mail-From: broonie@sirena.org.uk X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-8.3 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Subject: Applied "spi: bcm2835: fix overflow in calculation of transfer time" to the spi tree X-SA-Exim-Version: 4.2.1 (built Mon, 26 Dec 2011 16:24:06 +0000) X-SA-Exim-Scanned: Yes (on mezzanine.sirena.org.uk) 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 The patch spi: bcm2835: fix overflow in calculation of transfer time has been applied to the spi tree at git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark From c020e378b2b388b712a40dce2da6d437d2b6e0e0 Mon Sep 17 00:00:00 2001 From: Martin Sperl Date: Wed, 29 Jul 2015 07:34:10 +0000 Subject: [PATCH] spi: bcm2835: fix overflow in calculation of transfer time This resulted in the use of polling mode when other approaches (dma or interrupts) would have been more appropriate. Happened for transfers longer than 477 bytes. Reported-by: Noralf Tronnes Signed-off-by: Martin Sperl Signed-off-by: Mark Brown --- drivers/spi/spi-bcm2835.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c index 59705ab..767aa00 100644 --- a/drivers/spi/spi-bcm2835.c +++ b/drivers/spi/spi-bcm2835.c @@ -480,7 +480,7 @@ static int bcm2835_spi_transfer_one_poll(struct spi_master *master, struct spi_device *spi, struct spi_transfer *tfr, u32 cs, - unsigned long xfer_time_us) + unsigned long long xfer_time_us) { struct bcm2835_spi *bs = spi_master_get_devdata(master); unsigned long timeout; @@ -531,7 +531,8 @@ static int bcm2835_spi_transfer_one(struct spi_master *master, { struct bcm2835_spi *bs = spi_master_get_devdata(master); unsigned long spi_hz, clk_hz, cdiv; - unsigned long spi_used_hz, xfer_time_us; + unsigned long spi_used_hz; + unsigned long long xfer_time_us; u32 cs = bcm2835_rd(bs, BCM2835_SPI_CS); /* set clock */ @@ -575,9 +576,10 @@ static int bcm2835_spi_transfer_one(struct spi_master *master, bs->rx_len = tfr->len; /* calculate the estimated time in us the transfer runs */ - xfer_time_us = tfr->len + xfer_time_us = (unsigned long long)tfr->len * 9 /* clocks/byte - SPI-HW waits 1 clock after each byte */ - * 1000000 / spi_used_hz; + * 1000000; + do_div(xfer_time_us, spi_used_hz); /* for short requests run polling*/ if (xfer_time_us <= BCM2835_SPI_POLLING_LIMIT_US)