From patchwork Thu Aug 28 06:54:21 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Horman X-Patchwork-Id: 4795691 Return-Path: X-Original-To: patchwork-ltsi-dev@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 3B9B69F375 for ; Thu, 28 Aug 2014 07:46:18 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 5CCD12016C for ; Thu, 28 Aug 2014 07:46:16 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 176DC20122 for ; Thu, 28 Aug 2014 07:46:15 +0000 (UTC) Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id 8E1B6FCA; Thu, 28 Aug 2014 07:27:43 +0000 (UTC) X-Original-To: ltsi-dev@lists.linuxfoundation.org Delivered-To: ltsi-dev@mail.linuxfoundation.org Received: from smtp2.linuxfoundation.org (smtp2.linux-foundation.org [172.17.192.36]) by mail.linuxfoundation.org (Postfix) with ESMTPS id B92CCF12 for ; Thu, 28 Aug 2014 07:27:41 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from kirsty.vergenet.net (kirsty.vergenet.net [202.4.237.240]) by smtp2.linuxfoundation.org (Postfix) with ESMTP id 00D171DCC8 for ; Thu, 28 Aug 2014 07:27:40 +0000 (UTC) Received: from ayumi.isobedori.kobe.vergenet.net (p4222-ipbfp1605kobeminato.hyogo.ocn.ne.jp [114.154.95.222]) by kirsty.vergenet.net (Postfix) with ESMTP id 5EBC32671CB; Thu, 28 Aug 2014 17:07:46 +1000 (EST) Received: by ayumi.isobedori.kobe.vergenet.net (Postfix, from userid 7100) id E3217EDEAE6; Thu, 28 Aug 2014 16:07:44 +0900 (JST) From: Simon Horman To: ltsi-dev@lists.linuxfoundation.org Date: Thu, 28 Aug 2014 15:54:21 +0900 Message-Id: <1409209620-24487-136-git-send-email-horms+renesas@verge.net.au> X-Mailer: git-send-email 2.0.1 In-Reply-To: <1409209620-24487-1-git-send-email-horms+renesas@verge.net.au> References: <1409209620-24487-1-git-send-email-horms+renesas@verge.net.au> X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org Cc: Magnus Damm Subject: [LTSI-dev] [PATCH LTSI-3.14 135/894] spi: sh-msiof: Move clock management to (un)prepare_message() X-BeenThere: ltsi-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "A list to discuss patches, development, and other things related to the LTSI project" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: ltsi-dev-bounces@lists.linuxfoundation.org Errors-To: ltsi-dev-bounces@lists.linuxfoundation.org X-Virus-Scanned: ClamAV using ClamSMTP From: Geert Uytterhoeven Move clock management and pin configuration from the bitbang chipselect() method to the SPI core prepare_message() and unprepare_message() methods. As spi_master.{,un}prepare_message() is guaranteed to be called in matching pairs, the clock management synchronization is no longer needed. As sh_msiof_spi_set_pin_regs() is no longer called at spi_master.setup() time (through spi_bitbang_setup() and the spi_bitbang.chipselect() callback), we now have to take care of that ourselves. Signed-off-by: Geert Uytterhoeven Acked-by: Magnus Damm Signed-off-by: Mark Brown (cherry picked from commit c833ff7304511805ce5a3378d1637e39e00e00ea) Signed-off-by: Simon Horman --- drivers/spi/spi-sh-msiof.c | 61 +++++++++++++++++++++++++++++----------------- 1 file changed, 38 insertions(+), 23 deletions(-) diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c index aa60955..9e891c3 100644 --- a/drivers/spi/spi-sh-msiof.c +++ b/drivers/spi/spi-sh-msiof.c @@ -45,7 +45,6 @@ struct sh_msiof_spi_priv { const struct sh_msiof_chipdata *chipdata; struct sh_msiof_spi_info *info; struct completion done; - unsigned long flags; int tx_fifo_size; int rx_fifo_size; }; @@ -458,6 +457,7 @@ static int sh_msiof_spi_setup_transfer(struct spi_device *spi, static int sh_msiof_spi_setup(struct spi_device *spi) { struct device_node *np = spi->master->dev.of_node; + struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master); if (!np) { /* @@ -467,12 +467,46 @@ static int sh_msiof_spi_setup(struct spi_device *spi) spi->cs_gpio = (uintptr_t)spi->controller_data; } + /* Configure pins before deasserting CS */ + sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL), + !!(spi->mode & SPI_CPHA), + !!(spi->mode & SPI_3WIRE), + !!(spi->mode & SPI_LSB_FIRST), + !!(spi->mode & SPI_CS_HIGH)); + return spi_bitbang_setup(spi); } +static int sh_msiof_prepare_message(struct spi_master *master, + struct spi_message *msg) +{ + struct sh_msiof_spi_priv *p = spi_master_get_devdata(master); + const struct spi_device *spi = msg->spi; + + pm_runtime_get_sync(&p->pdev->dev); + clk_enable(p->clk); + + /* Configure pins before asserting CS */ + sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL), + !!(spi->mode & SPI_CPHA), + !!(spi->mode & SPI_3WIRE), + !!(spi->mode & SPI_LSB_FIRST), + !!(spi->mode & SPI_CS_HIGH)); + return 0; +} + +static int sh_msiof_unprepare_message(struct spi_master *master, + struct spi_message *msg) +{ + struct sh_msiof_spi_priv *p = spi_master_get_devdata(master); + + clk_disable(p->clk); + pm_runtime_put(&p->pdev->dev); + return 0; +} + static void sh_msiof_spi_chipselect(struct spi_device *spi, int is_on) { - struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master); int value; /* chip select is active low unless SPI_CS_HIGH is set */ @@ -481,29 +515,8 @@ static void sh_msiof_spi_chipselect(struct spi_device *spi, int is_on) else value = (is_on == BITBANG_CS_ACTIVE) ? 0 : 1; - if (is_on == BITBANG_CS_ACTIVE) { - if (!test_and_set_bit(0, &p->flags)) { - pm_runtime_get_sync(&p->pdev->dev); - clk_enable(p->clk); - } - - /* Configure pins before asserting CS */ - sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL), - !!(spi->mode & SPI_CPHA), - !!(spi->mode & SPI_3WIRE), - !!(spi->mode & SPI_LSB_FIRST), - !!(spi->mode & SPI_CS_HIGH)); - } - if (spi->cs_gpio >= 0) gpio_set_value(spi->cs_gpio, value); - - if (is_on == BITBANG_CS_INACTIVE) { - if (test_and_clear_bit(0, &p->flags)) { - clk_disable(p->clk); - pm_runtime_put(&p->pdev->dev); - } - } } static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p, @@ -810,6 +823,8 @@ static int sh_msiof_spi_probe(struct platform_device *pdev) master->num_chipselect = p->info->num_chipselect; master->setup = sh_msiof_spi_setup; master->cleanup = spi_bitbang_cleanup; + master->prepare_message = sh_msiof_prepare_message; + master->unprepare_message = sh_msiof_unprepare_message; p->bitbang.master = master; p->bitbang.chipselect = sh_msiof_spi_chipselect;