From patchwork Wed Jan 3 17:44:00 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 10142691 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 D1B476063B for ; Wed, 3 Jan 2018 17:44:05 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BE66629087 for ; Wed, 3 Jan 2018 17:44:05 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B33F029181; Wed, 3 Jan 2018 17:44:05 +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=unavailable 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 5C1C0290DE for ; Wed, 3 Jan 2018 17:44:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751106AbeACRoE (ORCPT ); Wed, 3 Jan 2018 12:44:04 -0500 Received: from heliosphere.sirena.org.uk ([172.104.155.198]:60158 "EHLO heliosphere.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751024AbeACRoE (ORCPT ); Wed, 3 Jan 2018 12:44:04 -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=ddBwksVeZ3ufG4u74QNlIlrR963EoVYGCntt+KnARuc=; b=UNLDNbUi+XVv JGuc6T7z34DZK6PUr/8Z4/T9kcSRN+kpIFJIMDIWiEu5IpSEAsoyktSE7nkJuP0V6QJ3B06+J8oLz zOtaZCV+mF5EDzHsHEFBvf7faclWKYrfPpAGhqFJekDuU6MtBiXhxnlHumMXnBWssiv6lVaZbTry5 61+/M=; 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 1eWn57-0005dr-4w; Wed, 03 Jan 2018 17:44:01 +0000 Received: from broonie by debutante with local (Exim 4.90) (envelope-from ) id 1eWn56-0005rw-N5; Wed, 03 Jan 2018 17:44:00 +0000 From: Mark Brown To: Geert Uytterhoeven Cc: Mark Brown , Mark Brown , Dirk Behme , linux-spi@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-spi@vger.kernel.org Subject: Applied "spi: sh-msiof: Fix timeout failures for TX-only DMA transfers" to the spi tree In-Reply-To: <1514999474-22288-1-git-send-email-geert+renesas@glider.be> Message-Id: Date: Wed, 03 Jan 2018 17:44:00 +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: sh-msiof: Fix timeout failures for TX-only DMA transfers 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 89434c3c35081439627baa2225622d5bd12242fe Mon Sep 17 00:00:00 2001 From: Geert Uytterhoeven Date: Wed, 3 Jan 2018 18:11:14 +0100 Subject: [PATCH] spi: sh-msiof: Fix timeout failures for TX-only DMA transfers When using RX (with or without TX), the DMA interrupt triggers completion when the RX FIFO has been emptied, i.e. after the full transfer has finished. However, when using TX without RX, the DMA interrupt triggers completion as soon as the DMA engine has filled the TX FIFO, i.e. before the full transfer has finished. Then sh_msiof_modify_ctr_wait() will spin until the transfer has really finished and the TFSE bit is cleared, for at most 1 ms. For slow speeds and/or large transfers, this may cause timeouts and transfer failures: spi_sh_msiof e6e10000.spi: failed to shut down hardware 74x164 spi2.0: SPI transfer failed: -110 spi_master spi2: failed to transfer one message from queue 74x164 spi2.0: Failed writing: -110 Fix this by waiting explicitly until the TX FIFO has been emptied. Based on a patch in the BSP by Hiromitsu Yamasaki. Signed-off-by: Geert Uytterhoeven Signed-off-by: Mark Brown --- drivers/spi/spi-sh-msiof.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c index fcd261f98b9f..06bc4b170c47 100644 --- a/drivers/spi/spi-sh-msiof.c +++ b/drivers/spi/spi-sh-msiof.c @@ -784,11 +784,21 @@ static int sh_msiof_dma_once(struct sh_msiof_spi_priv *p, const void *tx, goto stop_dma; } - /* wait for tx fifo to be emptied / rx fifo to be filled */ + /* wait for tx/rx DMA completion */ ret = sh_msiof_wait_for_completion(p); if (ret) goto stop_reset; + if (!rx) { + reinit_completion(&p->done); + sh_msiof_write(p, IER, IER_TEOFE); + + /* wait for tx fifo to be emptied */ + ret = sh_msiof_wait_for_completion(p); + if (ret) + goto stop_reset; + } + /* clear status bits */ sh_msiof_reset_str(p);