linux-kernel - [PATCH 3/5] mtd: devices: m25p80: add support for mmap read request

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Message-ID: <1441355402-6837-4-git-send-email-vigneshr@ti.com>
Date:	Fri, 4 Sep 2015 14:00:00 +0530
From:	Vignesh R <vigneshr@...com>
To:	Benoit Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	Mark Brown <broonie@...nel.org>, <hramrach@...il.com>
CC:	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-mtd@...ts.infradead.org>, <linux-spi@...r.kernel.org>,
	Vignesh R <vigneshr@...com>
Subject: [PATCH 3/5] mtd: devices: m25p80: add support for mmap read request

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 <vigneshr@...com>
---
 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

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