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Wed, 20 May 2020 12:34:23 +0000 From: Robin Gong To: mark.rutland@arm.com, broonie@kernel.org, robh+dt@kernel.org, catalin.marinas@arm.com, vkoul@kernel.org, will.deacon@arm.com, shawnguo@kernel.org, festevam@gmail.com, s.hauer@pengutronix.de, martin.fuzzey@flowbird.group, u.kleine-koenig@pengutronix.de, dan.j.williams@intel.com Cc: linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kernel@pengutronix.de, linux-imx@nxp.com Subject: [PATCH v8 05/13] spi: imx: fallback to PIO if dma setup failure Date: Thu, 21 May 2020 04:34:17 +0800 Message-Id: <1590006865-20900-6-git-send-email-yibin.gong@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1590006865-20900-1-git-send-email-yibin.gong@nxp.com> References: <1590006865-20900-1-git-send-email-yibin.gong@nxp.com> Content-Type: text/plain X-ClientProxiedBy: SG2PR03CA0103.apcprd03.prod.outlook.com (2603:1096:4:7c::31) To AM6PR04MB6630.eurprd04.prod.outlook.com (2603:10a6:20b:f4::33) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from robin-OptiPlex-790.ap.freescale.net (119.31.174.66) by SG2PR03CA0103.apcprd03.prod.outlook.com (2603:1096:4:7c::31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.20.3021.12 via Frontend Transport; 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For example, sdma firmware not updated but ERR009165 workaroud added in kernel. Signed-off-by: Robin Gong --- drivers/spi/spi-imx.c | 31 +++++++++++++++++++++++++++---- 1 file changed, 27 insertions(+), 4 deletions(-) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index f4f28a4..b7a85e3 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -71,6 +71,7 @@ struct spi_imx_devtype_data { void (*reset)(struct spi_imx_data *); void (*setup_wml)(struct spi_imx_data *); void (*disable)(struct spi_imx_data *); + void (*disable_dma)(struct spi_imx_data *); bool has_dmamode; bool has_slavemode; unsigned int fifo_size; @@ -485,6 +486,11 @@ static void mx51_ecspi_trigger(struct spi_imx_data *spi_imx) writel(reg, spi_imx->base + MX51_ECSPI_CTRL); } +static void mx51_disable_dma(struct spi_imx_data *spi_imx) +{ + writel(0, spi_imx->base + MX51_ECSPI_DMA); +} + static void mx51_ecspi_disable(struct spi_imx_data *spi_imx) { u32 ctrl; @@ -987,6 +993,7 @@ static struct spi_imx_devtype_data imx51_ecspi_devtype_data = { .rx_available = mx51_ecspi_rx_available, .reset = mx51_ecspi_reset, .setup_wml = mx51_setup_wml, + .disable_dma = mx51_disable_dma, .fifo_size = 64, .has_dmamode = true, .dynamic_burst = true, @@ -1001,6 +1008,7 @@ static struct spi_imx_devtype_data imx53_ecspi_devtype_data = { .prepare_transfer = mx51_ecspi_prepare_transfer, .trigger = mx51_ecspi_trigger, .rx_available = mx51_ecspi_rx_available, + .disable_dma = mx51_disable_dma, .reset = mx51_ecspi_reset, .fifo_size = 64, .has_dmamode = true, @@ -1385,6 +1393,7 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc_tx) { dmaengine_terminate_all(master->dma_tx); + dmaengine_terminate_all(master->dma_rx); return -EINVAL; } @@ -1498,6 +1507,7 @@ static int spi_imx_transfer(struct spi_device *spi, struct spi_transfer *transfer) { struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); + int ret; /* flush rxfifo before transfer */ while (spi_imx->devtype_data->rx_available(spi_imx)) @@ -1506,10 +1516,23 @@ static int spi_imx_transfer(struct spi_device *spi, if (spi_imx->slave_mode) return spi_imx_pio_transfer_slave(spi, transfer); - if (spi_imx->usedma) - return spi_imx_dma_transfer(spi_imx, transfer); - else - return spi_imx_pio_transfer(spi, transfer); + /* + * fallback PIO mode if dma setup error happen, for example sdma + * firmware may not be updated as ERR009165 required. + */ + if (spi_imx->usedma) { + ret = spi_imx_dma_transfer(spi_imx, transfer); + if (ret != -EINVAL) + return ret; + + spi_imx->devtype_data->disable_dma(spi_imx); + + spi_imx->usedma = false; + spi_imx->dynamic_burst = spi_imx->devtype_data->dynamic_burst; + dev_dbg(&spi->dev, "Fallback to PIO mode\n"); + } + + return spi_imx_pio_transfer(spi, transfer); } static int spi_imx_setup(struct spi_device *spi) -- 2.7.4 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=3.0 tests=DATE_IN_FUTURE_06_12, DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B1FDAC433E0 for ; Wed, 20 May 2020 12:36:15 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 62D13207C4 for ; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Fallback to PIO in case dma setup failed. For example, sdma firmware not updated but ERR009165 workaroud added in kernel. Signed-off-by: Robin Gong --- drivers/spi/spi-imx.c | 31 +++++++++++++++++++++++++++---- 1 file changed, 27 insertions(+), 4 deletions(-) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index f4f28a4..b7a85e3 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -71,6 +71,7 @@ struct spi_imx_devtype_data { void (*reset)(struct spi_imx_data *); void (*setup_wml)(struct spi_imx_data *); void (*disable)(struct spi_imx_data *); + void (*disable_dma)(struct spi_imx_data *); bool has_dmamode; bool has_slavemode; unsigned int fifo_size; @@ -485,6 +486,11 @@ static void mx51_ecspi_trigger(struct spi_imx_data *spi_imx) writel(reg, spi_imx->base + MX51_ECSPI_CTRL); } +static void mx51_disable_dma(struct spi_imx_data *spi_imx) +{ + writel(0, spi_imx->base + MX51_ECSPI_DMA); +} + static void mx51_ecspi_disable(struct spi_imx_data *spi_imx) { u32 ctrl; @@ -987,6 +993,7 @@ static struct spi_imx_devtype_data imx51_ecspi_devtype_data = { .rx_available = mx51_ecspi_rx_available, .reset = mx51_ecspi_reset, .setup_wml = mx51_setup_wml, + .disable_dma = mx51_disable_dma, .fifo_size = 64, .has_dmamode = true, .dynamic_burst = true, @@ -1001,6 +1008,7 @@ static struct spi_imx_devtype_data imx53_ecspi_devtype_data = { .prepare_transfer = mx51_ecspi_prepare_transfer, .trigger = mx51_ecspi_trigger, .rx_available = mx51_ecspi_rx_available, + .disable_dma = mx51_disable_dma, .reset = mx51_ecspi_reset, .fifo_size = 64, .has_dmamode = true, @@ -1385,6 +1393,7 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc_tx) { dmaengine_terminate_all(master->dma_tx); + dmaengine_terminate_all(master->dma_rx); return -EINVAL; } @@ -1498,6 +1507,7 @@ static int spi_imx_transfer(struct spi_device *spi, struct spi_transfer *transfer) { struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); + int ret; /* flush rxfifo before transfer */ while (spi_imx->devtype_data->rx_available(spi_imx)) @@ -1506,10 +1516,23 @@ static int spi_imx_transfer(struct spi_device *spi, if (spi_imx->slave_mode) return spi_imx_pio_transfer_slave(spi, transfer); - if (spi_imx->usedma) - return spi_imx_dma_transfer(spi_imx, transfer); - else - return spi_imx_pio_transfer(spi, transfer); + /* + * fallback PIO mode if dma setup error happen, for example sdma + * firmware may not be updated as ERR009165 required. + */ + if (spi_imx->usedma) { + ret = spi_imx_dma_transfer(spi_imx, transfer); + if (ret != -EINVAL) + return ret; + + spi_imx->devtype_data->disable_dma(spi_imx); + + spi_imx->usedma = false; + spi_imx->dynamic_burst = spi_imx->devtype_data->dynamic_burst; + dev_dbg(&spi->dev, "Fallback to PIO mode\n"); + } + + return spi_imx_pio_transfer(spi, transfer); } static int spi_imx_setup(struct spi_device *spi) -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel