[RFC PATCH 0/2] mtd: spi-nor: Handle vmalloc'd buffers

From: Vignesh R <vigneshr@ti.com>
To: David Woodhouse <dwmw2@infradead.org>,
	Brian Norris <computersforpeace@gmail.com>,
	Boris Brezillon <boris.brezillon@free-electrons.com>,
	Marek Vasut <marek.vasut@gmail.com>,
	Richard Weinberger <richard@nod.at>,
	Cyrille Pitchen <cyrille.pitchen@atmel.com>
Cc: Frode Isaksen <fisaksen@baylibre.com>,
	Vignesh R <vigneshr@ti.com>,
	linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org,
	linux-mtd@lists.infradead.org, linux-omap@vger.kernel.org
Subject: [RFC PATCH 0/2] mtd: spi-nor: Handle vmalloc'd buffers
Date: Mon, 27 Feb 2017 17:38:37 +0530	[thread overview]
Message-ID: <20170227120839.16545-1-vigneshr@ti.com> (raw)

This series implements bounce buffer support to handle vmalloc'd buffers
in case of drivers use DMA, similar to what is done in MTD NAND
framework.

I have tested this on two platform:
DRA74 SoC (cortex a15 @1GHz) with s25fl256s1 QSPI (SPI bus frequency
76.8 MHz) and I don't see any performance degradation with UBIFS
read/write(10MB file).
AM437x SoC (cortex a9 @1GHz) with macronix mx66l51235l QSPI flash (SPI bus
frequency 48MHz) and performance degradation is <4% for UBIFS.

Vignesh R (2):
  mtd: spi-nor: Introduce bounce buffer to handle vmalloc'd buffers
  mtd: devices: m25p80: Enable spi-nor bounce buffer support

 drivers/mtd/devices/m25p80.c  |  1 +
 drivers/mtd/spi-nor/spi-nor.c | 30 +++++++++++++++++++++++++++---
 include/linux/mtd/spi-nor.h   |  4 ++++
 3 files changed, 32 insertions(+), 3 deletions(-)

-- 
2.11.0

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