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Thu, 11 Mar 2021 13:12:26 -0600 Received: from DLEE103.ent.ti.com (157.170.170.33) by DLEE114.ent.ti.com (157.170.170.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Thu, 11 Mar 2021 13:12:26 -0600 Received: from fllv0039.itg.ti.com (10.64.41.19) by DLEE103.ent.ti.com (157.170.170.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2 via Frontend Transport; Thu, 11 Mar 2021 13:12:26 -0600 Received: from pratyush-OptiPlex-790.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id 12BJCHvS080816; Thu, 11 Mar 2021 13:12:22 -0600 From: Pratyush Yadav To: Nishanth Menon , Tero Kristo , Rob Herring , Tudor Ambarus , Michael Walle , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Mark Brown , , , , , CC: Pratyush Yadav , Lokesh Vutla Subject: [RFC PATCH 1/6] spi: spi-mem: Tell controller when device is ready for calibration Date: Fri, 12 Mar 2021 00:42:11 +0530 Message-ID: <20210311191216.7363-2-p.yadav@ti.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210311191216.7363-1-p.yadav@ti.com> References: <20210311191216.7363-1-p.yadav@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210311_191232_555453_42AEEA00 X-CRM114-Status: GOOD ( 18.01 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Some controllers like the Cadence OSPI controller need to perform a calibration sequence to operate at high clock speeds. This calibration should happen after the flash is fully initialized otherwise the calibration might happen in a different SPI mode from the one the flash is finally set to. Add a hook that can be used to tell the controller when the flash is ready for calibration. Whether calibration is needed depends on the controller. Signed-off-by: Pratyush Yadav --- drivers/spi/spi-mem.c | 12 ++++++++++++ include/linux/spi/spi-mem.h | 8 ++++++++ 2 files changed, 20 insertions(+) diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c index dc713b0c3c4d..e2f05ad3f4dc 100644 --- a/drivers/spi/spi-mem.c +++ b/drivers/spi/spi-mem.c @@ -464,6 +464,18 @@ int spi_mem_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) } EXPORT_SYMBOL_GPL(spi_mem_adjust_op_size); +int spi_mem_do_calibration(struct spi_mem *mem, struct spi_mem_op *op) +{ + struct spi_controller *ctlr = mem->spi->controller; + + if (!ctlr->mem_ops || !ctlr->mem_ops->do_calibration) + return -EOPNOTSUPP; + + ctlr->mem_ops->do_calibration(mem, op); + return 0; +} +EXPORT_SYMBOL_GPL(spi_mem_do_calibration); + static ssize_t spi_mem_no_dirmap_read(struct spi_mem_dirmap_desc *desc, u64 offs, size_t len, void *buf) { diff --git a/include/linux/spi/spi-mem.h b/include/linux/spi/spi-mem.h index 2b65c9edc34e..97a2d280f2d0 100644 --- a/include/linux/spi/spi-mem.h +++ b/include/linux/spi/spi-mem.h @@ -250,6 +250,12 @@ static inline void *spi_mem_get_drvdata(struct spi_mem *mem) * the currently mapped area), and the caller of * spi_mem_dirmap_write() is responsible for calling it again in * this case. + * @do_calibration: perform calibration needed for high SPI clock speed + * operation. Should be called after the SPI memory device has + * been completely initialized. The op passed should contain + * a template for the read operation used for the device so + * the controller can decide what type of calibration is + * required for this type of read. * * This interface should be implemented by SPI controllers providing an * high-level interface to execute SPI memory operation, which is usually the @@ -274,6 +280,7 @@ struct spi_controller_mem_ops { u64 offs, size_t len, void *buf); ssize_t (*dirmap_write)(struct spi_mem_dirmap_desc *desc, u64 offs, size_t len, const void *buf); + void (*do_calibration)(struct spi_mem *mem, struct spi_mem_op *op); }; /** @@ -346,6 +353,7 @@ bool spi_mem_dtr_supports_op(struct spi_mem *mem, #endif /* CONFIG_SPI_MEM */ int spi_mem_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op); +int spi_mem_do_calibration(struct spi_mem *mem, struct spi_mem_op *op); bool spi_mem_supports_op(struct spi_mem *mem, const struct spi_mem_op *op);