From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vignesh R Subject: [PATCH v3 3/5] mtd: devices: m25p80: add support for mmap read request Date: Tue, 10 Nov 2015 10:59:57 +0530 Message-ID: <1447133399-25658-4-git-send-email-vigneshr@ti.com> References: <1447133399-25658-1-git-send-email-vigneshr@ti.com> Mime-Version: 1.0 Content-Type: text/plain Cc: Rob Herring , Michal Suchanek , Russell King , Vignesh R , , , , , , To: Mark Brown , Tony Lindgren Return-path: In-Reply-To: <1447133399-25658-1-git-send-email-vigneshr@ti.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-spi.vger.kernel.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() interface, if supported, to make use of memory-mapped interface. Signed-off-by: Vignesh R --- drivers/mtd/devices/m25p80.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c index fe9ceb7b5405..7ef0c5009ead 100644 --- a/drivers/mtd/devices/m25p80.c +++ b/drivers/mtd/devices/m25p80.c @@ -131,6 +131,11 @@ 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_mmap_read_supported(spi)) + return 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)); -- 2.6.3