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dkim=none (message not signed) header.d=none;kernel.org; dmarc=none action=none header.from=nxp.com; Received: from VE1PR04MB6638.eurprd04.prod.outlook.com (2603:10a6:803:119::15) by VE1PR04MB6623.eurprd04.prod.outlook.com (2603:10a6:803:125::29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3088.24; Tue, 16 Jun 2020 14:42:40 +0000 Received: from VE1PR04MB6638.eurprd04.prod.outlook.com ([fe80::5cc4:23a5:ca17:da7d]) by VE1PR04MB6638.eurprd04.prod.outlook.com ([fe80::5cc4:23a5:ca17:da7d%6]) with mapi id 15.20.3088.028; Tue, 16 Jun 2020 14:42:40 +0000 From: Robin Gong To: broonie@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de, festevam@gmail.com, robin.murphy@arm.com, matthias.schiffer@ew.tq-group.com Subject: [PATCH v2 1/2] spi: introduce fallback to pio Date: Wed, 17 Jun 2020 06:42:08 +0800 Message-Id: <1592347329-28363-2-git-send-email-yibin.gong@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1592347329-28363-1-git-send-email-yibin.gong@nxp.com> References: <1592347329-28363-1-git-send-email-yibin.gong@nxp.com> X-ClientProxiedBy: SG2PR06CA0163.apcprd06.prod.outlook.com (2603:1096:1:1e::17) To VE1PR04MB6638.eurprd04.prod.outlook.com (2603:10a6:803:119::15) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from robin-OptiPlex-790.ap.freescale.net (119.31.174.66) by SG2PR06CA0163.apcprd06.prod.outlook.com (2603:1096:1:1e::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.20.3109.21 via Frontend Transport; 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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: QFkYbXSzftPozic39eAceOOx3vLBtRUbARB77WCM0nAVOJA64Ci5vPtYX9Njo5L+5Vu7jJMSrSABNdaEEF5ZHgIO5V7i67yMsS32jQ7KTlhuOjJ8j7bVve6OpC/9uPswJUD/Vrg4i1e2sKFPDRx8C3bSvMyaJ98cCEGcBCdi1N19JcJGximBjCO/s3l5m+B2feIf9t5yC6w+YgUjm3z62cWoHgF+KS8t8iTXyCxP69igXoHy5qzOE9tEZtFWqpjRYtM0EL++1fOVA6PkZmPuUJPeTL5tzvLUmDQHDGbGZdyxcKb/9SYNl0zVdu+O2kjOZ1FDN3GHMe8Ao6Vd+0w7OgGBqF+R8j7np5uSGS7bdEN5Oopot3yignM7Dd6Tabo1Zdv3GGRXax0mU+xkfI5HvgyKLbvD31CqQfmz4wcOkdg+xzEIGz0AAJCVwc+UkJ+KxgRVWSJa5Di8HpjAPWvk2dQzhrZR9kwB2V4s2YdJHrs= X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 8d1c0c6d-7af3-43e0-716a-08d812038564 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Jun 2020 14:42:40.8547 (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: M/7tG3bokG7qyP3RGzTbBm6VLEqB5hXrVNb8ckXGUgGJCb95iX9N4zWSAjwJILTEBQxARnExiHKGtoIs3tYuDw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VE1PR04MB6623 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200616_074244_371777_4BA43593 X-CRM114-Status: GOOD ( 15.15 ) 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 [40.107.8.55 listed in list.dnswl.org] -0.0 RCVD_IN_MSPIKE_H2 RBL: Average reputation (+2) [40.107.8.55 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 to pio mode in case dma transfer failed with error status SPI_TRANS_FAIL_NO_START. If spi client driver want to enable this feature please set xfer->error in the proper place such as dmaengine_prep_slave_sg() failure detect(but no any data put into spi bus yet). Besides, add master->fallback checking in its can_dma() so that spi core could switch to pio next time. Please refer to spi-imx.c. Signed-off-by: Robin Gong --- drivers/spi/spi.c | 12 ++++++++++++ include/linux/spi/spi.h | 7 +++++++ 2 files changed, 19 insertions(+) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 8158e28..6fa5659 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -982,6 +982,8 @@ static int __spi_unmap_msg(struct spi_controller *ctlr, struct spi_message *msg) spi_unmap_buf(ctlr, tx_dev, &xfer->tx_sg, DMA_TO_DEVICE); } + ctlr->cur_msg_mapped = false; + return 0; } #else /* !CONFIG_HAS_DMA */ @@ -1234,8 +1236,17 @@ static int spi_transfer_one_message(struct spi_controller *ctlr, if (xfer->tx_buf || xfer->rx_buf) { reinit_completion(&ctlr->xfer_completion); +fallback_pio: ret = ctlr->transfer_one(ctlr, msg->spi, xfer); if (ret < 0) { + if (ctlr->cur_msg_mapped && + (xfer->error & SPI_TRANS_FAIL_NO_START)) { + __spi_unmap_msg(ctlr, msg); + ctlr->fallback = true; + xfer->error &= ~SPI_TRANS_FAIL_NO_START; + goto fallback_pio; + } + SPI_STATISTICS_INCREMENT_FIELD(statm, errors); SPI_STATISTICS_INCREMENT_FIELD(stats, @@ -1693,6 +1704,7 @@ void spi_finalize_current_message(struct spi_controller *ctlr) spin_lock_irqsave(&ctlr->queue_lock, flags); ctlr->cur_msg = NULL; ctlr->cur_msg_prepared = false; + ctlr->fallback = false; kthread_queue_work(&ctlr->kworker, &ctlr->pump_messages); spin_unlock_irqrestore(&ctlr->queue_lock, flags); diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index aac57b5..b4917df 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -447,6 +447,8 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv) * If the driver does not set this, the SPI core takes the snapshot as * close to the driver hand-over as possible. * @irq_flags: Interrupt enable state during PTP system timestamping + * @fallback: fallback to pio if dma transfer return failure with + * SPI_TRANS_FAIL_NO_START. * * Each SPI controller can communicate with one or more @spi_device * children. These make a small bus, sharing MOSI, MISO and SCK signals @@ -602,6 +604,7 @@ struct spi_controller { bool auto_runtime_pm; bool cur_msg_prepared; bool cur_msg_mapped; + bool fallback; struct completion xfer_completion; size_t max_dma_len; @@ -847,6 +850,7 @@ extern void spi_res_release(struct spi_controller *ctlr, * back unset and they need the better resolution. * @timestamped_post: See above. The reason why both exist is that these * booleans are also used to keep state in the core SPI logic. + * @error: Error status logged by spi controller driver. * * SPI transfers always write the same number of bytes as they read. * Protocol drivers should always provide @rx_buf and/or @tx_buf. @@ -940,6 +944,9 @@ struct spi_transfer { bool timestamped; struct list_head transfer_list; + +#define SPI_TRANS_FAIL_NO_START BIT(0) + u16 error; }; /**