linux-kernel - [PATCH v2 3/5] mtd: devices: m25p80: add support for mmap read request

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Message-ID: <1446545174-14193-4-git-send-email-vigneshr@ti.com>
Date:	Tue, 3 Nov 2015 15:36:12 +0530
From:	Vignesh R <vigneshr@...com>
To:	Mark Brown <broonie@...nel.org>, Tony Lindgren <tony@...mide.com>
CC:	Michal Suchanek <hramrach@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Vignesh R <vigneshr@...com>, <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>
Subject: [PATCH v2 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() interface, if supported, to make use of
memory-mapped interface.

Signed-off-by: Vignesh R <vigneshr@...com>
---
 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 9cd3631170ef..3978bcb513b9 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -133,6 +133,11 @@ 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));
 
-- 
2.6.2

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