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[2.137.31.175]) by smtp.gmail.com with ESMTPSA id g26sm19958318wrb.51.2018.01.11.09.11.40 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 11 Jan 2018 09:11:40 -0800 (PST) From: =?utf-8?q?=C3=81lvaro_Fern=C3=A1ndez_Rojas?= To: u-boot@lists.denx.de, daniel.schwierzeck@gmail.com, sjg@chromium.org, jagannadh.teki@gmail.com, jagan@openedev.com, jagan@amarulasolutions.com, trini@konsulko.com, mateusz.kulikowski@gmail.com Date: Thu, 11 Jan 2018 18:11:24 +0100 Message-Id: <20180111171133.22779-4-noltari@gmail.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180111171133.22779-1-noltari@gmail.com> References: <1495135788-9152-1-git-send-email-noltari@gmail.com> <20180111171133.22779-1-noltari@gmail.com> MIME-Version: 1.0 Subject: [U-Boot] [PATCH v8 03/12] drivers: spi: allow limiting reads X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.18 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" For some SPI controllers it's not possible to keep the CS active between transfers and they are limited to a known number of bytes. This splits spi_flash reads into different iterations in order to respect the SPI controller limits. Signed-off-by: Álvaro Fernández Rojas Reviewed-by: Simon Glass Reviewed-by: Daniel Schwierzeck Reviewed-by: Jagan Teki --- v8: no changes v7: no changes v6: no changes v5: no changes v4: no changes v3: no changes v2: no changes drivers/mtd/spi/spi_flash.c | 3 +++ include/spi.h | 3 +++ 2 files changed, 6 insertions(+) diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c index 51e28bf07b..e40e1c01de 100644 --- a/drivers/mtd/spi/spi_flash.c +++ b/drivers/mtd/spi/spi_flash.c @@ -516,6 +516,9 @@ int spi_flash_cmd_read_ops(struct spi_flash *flash, u32 offset, else read_len = remain_len; + if (spi->max_read_size) + read_len = min(read_len, spi->max_read_size); + spi_flash_addr(read_addr, cmd); ret = spi_flash_read_common(flash, cmd, cmdsz, data, read_len); diff --git a/include/spi.h b/include/spi.h index 08c7480fda..4787454e59 100644 --- a/include/spi.h +++ b/include/spi.h @@ -86,6 +86,8 @@ struct dm_spi_slave_platdata { * @cs: ID of the chip select connected to the slave. * @mode: SPI mode to use for this slave (see SPI mode flags) * @wordlen: Size of SPI word in number of bits + * @max_read_size: If non-zero, the maximum number of bytes which can + * be read at once. * @max_write_size: If non-zero, the maximum number of bytes which can * be written at once, excluding command bytes. * @memory_map: Address of read-only SPI flash access. @@ -102,6 +104,7 @@ struct spi_slave { #endif uint mode; unsigned int wordlen; + unsigned int max_read_size; unsigned int max_write_size; void *memory_map;