From patchwork Sun Apr 22 18:35:15 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris Brezillon X-Patchwork-Id: 10355795 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 E72206019D for ; Sun, 22 Apr 2018 18:35:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D7EF72893B for ; Sun, 22 Apr 2018 18:35:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CC90E2893F; Sun, 22 Apr 2018 18:35:44 +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=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI 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 738DB28949 for ; Sun, 22 Apr 2018 18:35:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753423AbeDVSfn (ORCPT ); Sun, 22 Apr 2018 14:35:43 -0400 Received: from mail.bootlin.com ([62.4.15.54]:47236 "EHLO mail.bootlin.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753365AbeDVSfm (ORCPT ); Sun, 22 Apr 2018 14:35:42 -0400 Received: by mail.bootlin.com (Postfix, from userid 110) id 97B15206A0; Sun, 22 Apr 2018 20:35:40 +0200 (CEST) Received: from localhost.localdomain (unknown [195.53.49.241]) by mail.bootlin.com (Postfix) with ESMTPSA id C74B72076C; Sun, 22 Apr 2018 20:35:29 +0200 (CEST) From: Boris Brezillon To: David Woodhouse , Brian Norris , Boris Brezillon , Marek Vasut , Richard Weinberger , Cyrille Pitchen , linux-mtd@lists.infradead.org, Miquel Raynal , Mark Brown , linux-spi@vger.kernel.org Cc: Peter Pan , Frieder Schrempf , Vignesh R , Yogesh Gaur , =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= , Kamal Dasu , Maxime Chevallier Subject: [PATCH v3 2/9] spi: Add an helper to flush the message queue Date: Sun, 22 Apr 2018 20:35:15 +0200 Message-Id: <20180422183522.11118-3-boris.brezillon@bootlin.com> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20180422183522.11118-1-boris.brezillon@bootlin.com> References: <20180422183522.11118-1-boris.brezillon@bootlin.com> 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 This is needed by the spi-mem logic to force all messages that have been queued before a memory operation to be sent before we start the memory operation. We do that in order to guarantee that spi-mem operations do not preempt regular SPI transfers. Signed-off-by: Boris Brezillon --- Changes in v3: - prototype moved to drivers/spi/internals.h Changes in v2: - patch added --- drivers/spi/internals.h | 2 ++ drivers/spi/spi.c | 16 ++++++++++++++++ 2 files changed, 18 insertions(+) diff --git a/drivers/spi/internals.h b/drivers/spi/internals.h index dbe56c77b464..4a28a8395552 100644 --- a/drivers/spi/internals.h +++ b/drivers/spi/internals.h @@ -17,6 +17,8 @@ #include #include +void spi_flush_queue(struct spi_controller *ctrl); + #ifdef CONFIG_HAS_DMA int spi_map_buf(struct spi_controller *ctlr, struct device *dev, struct sg_table *sgt, void *buf, size_t len, diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index a59f01005906..9ab65fb2738e 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1522,6 +1522,22 @@ static int spi_controller_initialize_queue(struct spi_controller *ctlr) return ret; } +/** + * spi_flush_queue - Send all pending messages in the queue from the callers' + * context + * @ctlr: controller to process queue for + * + * This should be used when one wants to ensure all pending messages have been + * sent before doing something. Is used by the spi-mem code to make sure SPI + * memory operations do not preempt regular SPI transfers that have been queued + * before the spi-mem operation. + */ +void spi_flush_queue(struct spi_controller *ctlr) +{ + if (ctlr->transfer == spi_queued_transfer) + __spi_pump_messages(ctlr, false); +} + /*-------------------------------------------------------------------------*/ #if defined(CONFIG_OF)