linux-kernel - [RFC PATCH 2/2] mtd: devices: m25p80: Enable spi-nor bounce buffer support

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Date:   Mon, 27 Feb 2017 17:38:39 +0530
From:   Vignesh R <vigneshr@...com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>
CC:     <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-omap@...r.kernel.org>, Vignesh R <vigneshr@...com>,
        Frode Isaksen <fisaksen@...libre.com>,
        <linux-spi@...r.kernel.org>
Subject: [RFC PATCH 2/2] mtd: devices: m25p80: Enable spi-nor bounce buffer support

Many SPI controller drivers use DMA to read/write from m25p80 compatible
flashes. Therefore enable bounce buffers support provided by spi-nor
framework to take care of handling vmalloc'd buffers which may not be
DMA'able.

Signed-off-by: Vignesh R <vigneshr@...com>
---
 drivers/mtd/devices/m25p80.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index c4df3b1bded0..d05acf22eadf 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -241,6 +241,7 @@ static int m25p_probe(struct spi_device *spi)
 	else
 		flash_name = spi->modalias;
 
+	nor->flags |= SNOR_F_USE_BOUNCE_BUFFER;
 	ret = spi_nor_scan(nor, flash_name, mode);
 	if (ret)
 		return ret;
-- 
2.11.0