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CAT:NONE; SFTY:; SFS:(4636009)(366004)(8936002)(6512007)(6506007)(66946007)(66556008)(8676002)(4326008)(66476007)(498600001)(186003)(16526019)(86362001)(2906002)(83380400001)(6486002)(26005)(52116002)(36756003)(5660300002)(7416002)(2616005)(6666004)(956004); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: bf07b327-f169-4980-e1e8-08d812038a0f X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Jun 2020 14:42:48.5802 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: V+pzcmYib8kkVR9Is9sLUQWLAx6L9UOb2jMaM3a81xKbyvsd+MqvDlNfYRxQCZhLw7lRyo+qED5YCTEcJ/GFFA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VE1PR04MB6623 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200616_074252_025190_7C366376 X-CRM114-Status: GOOD ( 13.03 ) X-Spam-Score: -0.9 (/) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-0.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at https://www.dnswl.org/, low trust [40.107.8.59 listed in list.dnswl.org] -0.0 RCVD_IN_MSPIKE_H2 RBL: Average reputation (+2) [40.107.8.59 listed in wl.mailspike.net] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record 0.0 DATE_IN_FUTURE_06_12 Date: is 6 to 12 hours after Received: date -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.0 MSGID_FROM_MTA_HEADER Message-Id was added by a relay X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-imx@nxp.com, kernel@pengutronix.de, linux-spi@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Add fallback pio feature in case dma transfer failed before start. Besides, another whole pio transfer including setup_transfer will be issued by spi core, no need to restore jobs like commit bcd8e7761ec9 ("spi: imx: fallback to PIO if dma setup failure"). Signed-off-by: Robin Gong --- drivers/spi/spi-imx.c | 35 ++++++++++++++--------------------- 1 file changed, 14 insertions(+), 21 deletions(-) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index b7a85e3..2b8d339 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -224,7 +224,7 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, { struct spi_imx_data *spi_imx = spi_master_get_devdata(master); - if (!use_dma) + if (!use_dma || master->fallback) return false; if (!master->dma_rx) @@ -1364,11 +1364,12 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx, ret = spi_imx_dma_configure(master); if (ret) - return ret; + goto dma_failure_no_start; if (!spi_imx->devtype_data->setup_wml) { dev_err(spi_imx->dev, "No setup_wml()?\n"); - return -EINVAL; + ret = -EINVAL; + goto dma_failure_no_start; } spi_imx->devtype_data->setup_wml(spi_imx); @@ -1379,8 +1380,10 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx, desc_rx = dmaengine_prep_slave_sg(master->dma_rx, rx->sgl, rx->nents, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); - if (!desc_rx) - return -EINVAL; + if (!desc_rx) { + ret = -EINVAL; + goto dma_failure_no_start; + } desc_rx->callback = spi_imx_dma_rx_callback; desc_rx->callback_param = (void *)spi_imx; @@ -1425,6 +1428,10 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx, } return transfer->len; +/* fallback to pio */ +dma_failure_no_start: + transfer->error |= SPI_TRANS_FAIL_NO_START; + return ret; } static int spi_imx_pio_transfer(struct spi_device *spi, @@ -1507,7 +1514,6 @@ 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)) @@ -1516,21 +1522,8 @@ static int spi_imx_transfer(struct spi_device *spi, if (spi_imx->slave_mode) return spi_imx_pio_transfer_slave(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"); - } + if (spi_imx->usedma) + return spi_imx_dma_transfer(spi_imx, transfer); return spi_imx_pio_transfer(spi, transfer); }