From mboxrd@z Thu Jan 1 00:00:00 1970 From: vigneshr@ti.com (Vignesh R) Date: Fri, 4 Sep 2015 14:00:00 +0530 Subject: [PATCH 3/5] mtd: devices: m25p80: add support for mmap read request In-Reply-To: <1441355402-6837-1-git-send-email-vigneshr@ti.com> References: <1441355402-6837-1-git-send-email-vigneshr@ti.com> Message-ID: <1441355402-6837-4-git-send-email-vigneshr@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Certain spi controllers may support memory mapped interface to read from m25p80 type flash devices. This interface provides better read performance than regular SPI interface. Call spi_mtd_mmap_read() function, if available, to make use of memory-mapped interface. Signed-off-by: Vignesh R --- drivers/mtd/devices/m25p80.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c index d313f948b96c..b8b391aab331 100644 --- a/drivers/mtd/devices/m25p80.c +++ b/drivers/mtd/devices/m25p80.c @@ -133,6 +133,14 @@ static int m25p80_read(struct spi_nor *nor, loff_t from, size_t len, /* convert the dummy cycles to the number of bytes */ dummy /= 8; + if (spi->master->spi_mtd_mmap_read) { + return spi->master->spi_mtd_mmap_read(spi, from, len, + retlen, buf, + nor->read_opcode, + nor->addr_width, + dummy); + } + spi_message_init(&m); memset(t, 0, (sizeof t)); -- 2.5.1