From patchwork Wed Apr 18 11:40:38 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 10347983 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 221CB60365 for ; Wed, 18 Apr 2018 11:42:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 141BD285E4 for ; Wed, 18 Apr 2018 11:42:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0876A285EB; Wed, 18 Apr 2018 11:42:10 +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=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 4E8B2285E4 for ; Wed, 18 Apr 2018 11:42:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Date:Message-Id: In-Reply-To:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: References:List-Owner; bh=RcSgZuL43sKUTi3m025spzOSuDp5LPgWR0/ek3rje4Y=; b=c+e R1olJj78+YbUFvmPULK8Zb9LnNgAep+QLyLVyOeeT9v3kVkxIS6U7jq1uAWaMDJbylNmVAGUbGav/ URgzL9OUrNu4vm1JEw9993ZM2VOD7QFtXgW4l4HpIgT1wSg1IiWEDcHWpFhGu5xW0TKsJw+7LK7Lf KaMsSgZ45DS6XCNY2BotIAbGFSV28iCj7zdQfNOe81ph4acR63uP9UH6QgzS3AYlEoZDJReViEfBJ rgHAtT2DK+Ub68Ip2A8G0pjuAoapREeGs1FGEmSJj2afN4h332rHC6w+dFq0zGL1o5j7j5beHzptP 1l/6e1RHHlqz2XBSUe7awnahNPxXu8g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1f8lTI-00058p-83; Wed, 18 Apr 2018 11:41:56 +0000 Received: from heliosphere.sirena.org.uk ([2a01:7e01::f03c:91ff:fed4:a3b6]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1f8lSI-0004jO-PJ for linux-arm-kernel@lists.infradead.org; Wed, 18 Apr 2018 11:40:56 +0000 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=pVRWY0RZPYgiVKffuUL12ETqMr2TCRyQzKy6Ch9nV7U=; b=QeYBSfTIxTRo 313+N5JYA+QCRmtkK55lmqTVi0QaB1AJnicC1rQQZVjxm5eeGFpRFa227NSdd6PuUA4VXMYQMCGIz LdAZx3PUvkNoG4kd9ZaVGOIOFJlvhRP8+V1aDRSkCGsoraFFd1qe1ygnICygGwdNzeebe3XSJLJJN fLQ3A=; 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 1f8lS3-0000Y4-ED; Wed, 18 Apr 2018 11:40:39 +0000 Received: from broonie by debutante with local (Exim 4.90_1) (envelope-from ) id 1f8lS2-00023M-Sa; Wed, 18 Apr 2018 12:40:38 +0100 From: Mark Brown To: Sylwester Nawrocki Subject: Applied "spi: spi-s3c64xx: Allow higher transfer lengths in polling IO mode" to the spi tree In-Reply-To: <20180417142954.5507-8-s.nawrocki@samsung.com> Message-Id: Date: Wed, 18 Apr 2018 12:40:38 +0100 X-Bad-Reply: In-Reply-To but no 'Re:' in Subject. X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180418_044055_013395_5D4D0704 X-CRM114-Status: GOOD ( 19.24 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-samsung-soc@vger.kernel.org, b.zolnierkie@samsung.com, broonie@kernel.org, krzk@kernel.org, linux-spi@vger.kernel.org, kgene@kernel.org, andi@etezian.org, linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The patch spi: spi-s3c64xx: Allow higher transfer lengths in polling IO mode 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 0af7af7da6510f12595b81ba98bb15dd7ffed1f3 Mon Sep 17 00:00:00 2001 From: Sylwester Nawrocki Date: Tue, 17 Apr 2018 16:29:54 +0200 Subject: [PATCH] spi: spi-s3c64xx: Allow higher transfer lengths in polling IO mode Some variants of the SPI controller have no DMA support, in such case SPI transfers longer than the FIFO length are not currently properly handled by the driver. Fix it by doing multiple transfers in the s3c64xx_spi_transfer_one() function if the SPI transfer length exceeds the FIFO size. Signed-off-by: Sylwester Nawrocki Reviewed-by: Andi Shyti Signed-off-by: Mark Brown --- drivers/spi/spi-s3c64xx.c | 99 ++++++++++++++++++++++++++------------- 1 file changed, 66 insertions(+), 33 deletions(-) diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index 27cd8c59eabf..755ab2dc6969 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -635,11 +635,14 @@ static int s3c64xx_spi_transfer_one(struct spi_master *master, { struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); const unsigned int fifo_len = (FIFO_LVL_MASK(sdd) >> 1) + 1; + const void *tx_buf = NULL; + void *rx_buf = NULL; + int target_len = 0, origin_len = 0; + int use_dma = 0; int status; u32 speed; u8 bpw; unsigned long flags; - int use_dma; reinit_completion(&sdd->xfer_completion); @@ -654,47 +657,77 @@ static int s3c64xx_spi_transfer_one(struct spi_master *master, s3c64xx_spi_config(sdd); } - /* Polling method for xfers not bigger than FIFO capacity */ - use_dma = 0; if (!is_polling(sdd) && (xfer->len > fifo_len) && - sdd->rx_dma.ch && sdd->tx_dma.ch) + sdd->rx_dma.ch && sdd->tx_dma.ch) { use_dma = 1; - spin_lock_irqsave(&sdd->lock, flags); + } else if (is_polling(sdd) && xfer->len > fifo_len) { + tx_buf = xfer->tx_buf; + rx_buf = xfer->rx_buf; + origin_len = xfer->len; - /* Pending only which is to be done */ - sdd->state &= ~RXBUSY; - sdd->state &= ~TXBUSY; + target_len = xfer->len; + if (xfer->len > fifo_len) + xfer->len = fifo_len; + } + + do { + spin_lock_irqsave(&sdd->lock, flags); - s3c64xx_enable_datapath(sdd, xfer, use_dma); + /* Pending only which is to be done */ + sdd->state &= ~RXBUSY; + sdd->state &= ~TXBUSY; - /* Start the signals */ - s3c64xx_spi_set_cs(spi, true); + s3c64xx_enable_datapath(sdd, xfer, use_dma); - spin_unlock_irqrestore(&sdd->lock, flags); + /* Start the signals */ + s3c64xx_spi_set_cs(spi, true); - if (use_dma) - status = s3c64xx_wait_for_dma(sdd, xfer); - else - status = s3c64xx_wait_for_pio(sdd, xfer); - - if (status) { - dev_err(&spi->dev, "I/O Error: rx-%d tx-%d res:rx-%c tx-%c len-%d\n", - xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0, - (sdd->state & RXBUSY) ? 'f' : 'p', - (sdd->state & TXBUSY) ? 'f' : 'p', - xfer->len); - - if (use_dma) { - if (xfer->tx_buf != NULL - && (sdd->state & TXBUSY)) - dmaengine_terminate_all(sdd->tx_dma.ch); - if (xfer->rx_buf != NULL - && (sdd->state & RXBUSY)) - dmaengine_terminate_all(sdd->rx_dma.ch); + spin_unlock_irqrestore(&sdd->lock, flags); + + if (use_dma) + status = s3c64xx_wait_for_dma(sdd, xfer); + else + status = s3c64xx_wait_for_pio(sdd, xfer); + + if (status) { + dev_err(&spi->dev, + "I/O Error: rx-%d tx-%d res:rx-%c tx-%c len-%d\n", + xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0, + (sdd->state & RXBUSY) ? 'f' : 'p', + (sdd->state & TXBUSY) ? 'f' : 'p', + xfer->len); + + if (use_dma) { + if (xfer->tx_buf && (sdd->state & TXBUSY)) + dmaengine_terminate_all(sdd->tx_dma.ch); + if (xfer->rx_buf && (sdd->state & RXBUSY)) + dmaengine_terminate_all(sdd->rx_dma.ch); + } + } else { + s3c64xx_flush_fifo(sdd); } - } else { - s3c64xx_flush_fifo(sdd); + if (target_len > 0) { + target_len -= xfer->len; + + if (xfer->tx_buf) + xfer->tx_buf += xfer->len; + + if (xfer->rx_buf) + xfer->rx_buf += xfer->len; + + if (target_len > fifo_len) + xfer->len = fifo_len; + else + xfer->len = target_len; + } + } while (target_len > 0); + + if (origin_len) { + /* Restore original xfer buffers and length */ + xfer->tx_buf = tx_buf; + xfer->rx_buf = rx_buf; + xfer->len = origin_len; } return status;