From patchwork Mon Jul 24 07:47:23 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Varadarajan Narayanan X-Patchwork-Id: 9858943 X-Patchwork-Delegate: agross@codeaurora.org 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 A8B6A600F5 for ; Mon, 24 Jul 2017 07:50:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9A22E28575 for ; Mon, 24 Jul 2017 07:50:55 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8F1D22858A; Mon, 24 Jul 2017 07:50:55 +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 2E65F28575 for ; Mon, 24 Jul 2017 07:50:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753179AbdGXHuf (ORCPT ); Mon, 24 Jul 2017 03:50:35 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:59908 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752618AbdGXHsi (ORCPT ); Mon, 24 Jul 2017 03:48:38 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 6805F60A37; Mon, 24 Jul 2017 07:48:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1500882517; bh=kIeNolY49zSFFDW7IFRahibZmpW2nM9oaZOCCS83Vvc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=P5sa5hugOoq4SzQgnAz3FAOjZIIT3VpU/Dgf1lKy8MXy39MwteqMlSufhfh9MMAmR kvAhqDMLdbsbTFU1Bb4prihW+KSHacAH14wpWuhlqj8P3f7zWBk2GkdYjVc97mh1Lb cCXISOGnK+KL3vTm/7/V/ZgfGWgsdxHtb+rAfu3I= Received: from varda-linux.qualcomm.com (blr-c-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.19.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: varada@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 2F32B60A39; Mon, 24 Jul 2017 07:48:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1500882516; bh=kIeNolY49zSFFDW7IFRahibZmpW2nM9oaZOCCS83Vvc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BYfPuY4urCYe/OwtGKBYnr3Uamui4l0xA1ZVPyeRjRQPz8PInUXqBDR8QLTUmuZUB /EpBNMSO6JO2tk+wJS8H2z+xNVdrefQ42Zpr4Q/wcBsyIq9WUPq7fDvPPim8cfM8KW D0uZE33cCRy/q8fyH4Dfo9va7Myhlrzupbizk0ow= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 2F32B60A39 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=varada@codeaurora.org From: Varadarajan Narayanan To: broonie@kernel.org, robh+dt@kernel.org, mark.rutland@arm.com, andy.gross@linaro.org, david.brown@linaro.org, linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org Cc: Varadarajan Narayanan , Matthew McClintock Subject: [PATCH v5 12/14] spi: qup: allow multiple DMA transactions per spi xfer Date: Mon, 24 Jul 2017 13:17:23 +0530 Message-Id: <1500882445-29008-13-git-send-email-varada@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1500882445-29008-1-git-send-email-varada@codeaurora.org> References: <1500882445-29008-1-git-send-email-varada@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Much like the block mode changes, we are breaking up DMA transactions into 64K chunks so we can reset the QUP engine. Signed-off-by: Matthew McClintock Signed-off-by: Varadarajan Narayanan --- drivers/spi/spi-qup.c | 93 +++++++++++++++++++++++++++++++++++---------------- 1 file changed, 65 insertions(+), 28 deletions(-) diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c index 3ac9b25..3c2c2c0 100644 --- a/drivers/spi/spi-qup.c +++ b/drivers/spi/spi-qup.c @@ -418,12 +418,35 @@ static void spi_qup_dma_terminate(struct spi_master *master, dmaengine_terminate_all(master->dma_rx); } +static u32 spi_qup_sgl_get_nents_len(struct scatterlist *sgl, u32 max, + u32 *nents) +{ + struct scatterlist *sg; + u32 total = 0; + + *nents = 0; + + for (sg = sgl; sg; sg = sg_next(sg)) { + unsigned int len = sg_dma_len(sg); + + /* check for overflow as well as limit */ + if (((total + len) < total) || ((total + len) > max)) + break; + + total += len; + (*nents)++; + } + + return total; +} + static int spi_qup_do_dma(struct spi_device *spi, struct spi_transfer *xfer, unsigned long timeout) { dma_async_tx_callback rx_done = NULL, tx_done = NULL; struct spi_master *master = spi->master; struct spi_qup *qup = spi_master_get_devdata(master); + struct scatterlist *tx_sgl, *rx_sgl; int ret; if (xfer->rx_buf) @@ -431,43 +454,57 @@ static int spi_qup_do_dma(struct spi_device *spi, struct spi_transfer *xfer, else if (xfer->tx_buf) tx_done = spi_qup_dma_done; - ret = spi_qup_io_config(spi, xfer); - if (ret) - return ret; + rx_sgl = xfer->rx_sg.sgl; + tx_sgl = xfer->tx_sg.sgl; - /* before issuing the descriptors, set the QUP to run */ - ret = spi_qup_set_state(qup, QUP_STATE_RUN); - if (ret) { - dev_warn(qup->dev, "%s(%d): cannot set RUN state\n", - __func__, __LINE__); - return ret; - } + do { + u32 rx_nents, tx_nents; + + if (rx_sgl) + qup->n_words = spi_qup_sgl_get_nents_len(rx_sgl, + SPI_MAX_XFER, &rx_nents) / qup->w_size; + if (tx_sgl) + qup->n_words = spi_qup_sgl_get_nents_len(tx_sgl, + SPI_MAX_XFER, &tx_nents) / qup->w_size; + if (!qup->n_words) + return -EIO; - if (xfer->rx_buf) { - ret = spi_qup_prep_sg(master, xfer->rx_sg.sgl, - xfer->rx_sg.nents, DMA_DEV_TO_MEM, - rx_done); + ret = spi_qup_io_config(spi, xfer); if (ret) return ret; - dma_async_issue_pending(master->dma_rx); - } - - if (xfer->tx_buf) { - ret = spi_qup_prep_sg(master, xfer->tx_sg.sgl, - xfer->tx_sg.nents, DMA_MEM_TO_DEV, - tx_done); - if (ret) + /* before issuing the descriptors, set the QUP to run */ + ret = spi_qup_set_state(qup, QUP_STATE_RUN); + if (ret) { + dev_warn(qup->dev, "cannot set RUN state\n"); return ret; + } + if (rx_sgl) { + ret = spi_qup_prep_sg(master, rx_sgl, rx_nents, + DMA_DEV_TO_MEM, rx_done); + if (ret) + return ret; + dma_async_issue_pending(master->dma_rx); + } - dma_async_issue_pending(master->dma_tx); - } + if (tx_sgl) { + ret = spi_qup_prep_sg(master, tx_sgl, tx_nents, + DMA_MEM_TO_DEV, tx_done); + if (ret) + return ret; + + dma_async_issue_pending(master->dma_tx); + } + + if (!wait_for_completion_timeout(&qup->done, timeout)) + return -ETIMEDOUT; - if (rx_done && !wait_for_completion_timeout(&qup->done, timeout)) - return -ETIMEDOUT; + for (; rx_sgl && rx_nents--; rx_sgl = sg_next(rx_sgl)) + ; + for (; tx_sgl && tx_nents--; tx_sgl = sg_next(tx_sgl)) + ; - if (tx_done && !wait_for_completion_timeout(&qup->done, timeout)) - return -ETIMEDOUT; + } while (rx_sgl || tx_sgl); return 0; }