From patchwork Mon Nov 27 18:54:55 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 10077855 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 7BC11602BC for ; Mon, 27 Nov 2017 18:55:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7002128E1C for ; Mon, 27 Nov 2017 18:55:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6492C28E92; Mon, 27 Nov 2017 18:55:22 +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=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,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 F2A9828E1C for ; Mon, 27 Nov 2017 18:55:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932391AbdK0SzT (ORCPT ); Mon, 27 Nov 2017 13:55:19 -0500 Received: from heliosphere.sirena.org.uk ([172.104.155.198]:56442 "EHLO heliosphere.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753315AbdK0Sy6 (ORCPT ); Mon, 27 Nov 2017 13:54:58 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sirena.org.uk; s=20170815-heliosphere; h=Date:Message-Id:In-Reply-To: Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:References: List-Id:List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner: List-Archive; bh=70XpcMpWTPuPhFIFzFQyEMEp02jsPvgCOmaLKXyNitE=; b=j/1xO+XwSnQU j41keKugP77Vq/69vVIggyhuhcCaxIjpv/meLAdwBjo0zw0vkns9WE4dG4/nTGsdSgMjVaLhQUx/j sO3r00CnmmRSoCAwkejeubGol646c4+VvKFLmC01afRQ+OWziPpYJu7VI2leM96EpcXj9x9M0NiMb a1KBg=; Received: from debutante.sirena.org.uk ([2001:470:1f1d:6b5::3] helo=debutante) by heliosphere.sirena.org.uk with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1eJOYR-00078E-RB; Mon, 27 Nov 2017 18:54:55 +0000 Received: from broonie by debutante with local (Exim 4.89) (envelope-from ) id 1eJOYR-0007e7-EH; Mon, 27 Nov 2017 18:54:55 +0000 From: Mark Brown To: Maxime Chevallier Cc: Mark Brown , stable@vger.kernel.org, linux-spi@vger.kernel.org, broonie@kernel.org, linux-kernel@vger.kernel.org, gregory.clement@free-electrons.com, miquel.raynal@free-electrons.com, linux-spi@vger.kernel.org Subject: Applied "spi: a3700: Fix clk prescaling for coefficient over 15" to the spi tree In-Reply-To: <1511792192-7090-1-git-send-email-maxime.chevallier@smile.fr> Message-Id: Date: Mon, 27 Nov 2017 18:54:55 +0000 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: a3700: Fix clk prescaling for coefficient over 15 has been applied to the spi tree at https://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 251c201bf4f8b5bf4f1ccb4f8920eed2e1f57580 Mon Sep 17 00:00:00 2001 From: Maxime Chevallier Date: Mon, 27 Nov 2017 15:16:32 +0100 Subject: [PATCH] spi: a3700: Fix clk prescaling for coefficient over 15 The Armada 3700 SPI controller has 2 ranges of prescaler coefficients. One ranging from 0 to 15 by steps of 1, and one ranging from 0 to 30 by steps of 2. This commit fixes the prescaler coefficients that are over 15 so that it uses the correct range of values. The prescaling coefficient is rounded to the upper value if it is odd. This was tested on Espressobin with spidev and a locigal analyser. Signed-off-by: Maxime Chevallier Signed-off-by: Mark Brown Cc: stable@vger.kernel.org --- drivers/spi/spi-armada-3700.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/spi/spi-armada-3700.c b/drivers/spi/spi-armada-3700.c index 77fe55ce790c..d65345312527 100644 --- a/drivers/spi/spi-armada-3700.c +++ b/drivers/spi/spi-armada-3700.c @@ -79,6 +79,7 @@ #define A3700_SPI_BYTE_LEN BIT(5) #define A3700_SPI_CLK_PRESCALE BIT(0) #define A3700_SPI_CLK_PRESCALE_MASK (0x1f) +#define A3700_SPI_CLK_EVEN_OFFS (0x10) #define A3700_SPI_WFIFO_THRS_BIT 28 #define A3700_SPI_RFIFO_THRS_BIT 24 @@ -220,6 +221,13 @@ static void a3700_spi_clock_set(struct a3700_spi *a3700_spi, prescale = DIV_ROUND_UP(clk_get_rate(a3700_spi->clk), speed_hz); + /* For prescaler values over 15, we can only set it by steps of 2. + * Starting from A3700_SPI_CLK_EVEN_OFFS, we set values from 0 up to + * 30. We only use this range from 16 to 30. + */ + if (prescale > 15) + prescale = A3700_SPI_CLK_EVEN_OFFS + DIV_ROUND_UP(prescale, 2); + val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); val = val & ~A3700_SPI_CLK_PRESCALE_MASK;