From mboxrd@z Thu Jan 1 00:00:00 1970 From: Frode Isaksen Subject: Re: [RFC PATCH 0/2] mtd: spi-nor: Handle vmalloc'd buffers Date: Mon, 27 Feb 2017 15:03:57 +0100 Message-ID: <884efafc-6b34-0cb6-4c9f-e3a926114130@baylibre.com> References: <20170227120839.16545-1-vigneshr@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20170227120839.16545-1-vigneshr@ti.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-mtd" Errors-To: linux-mtd-bounces+gldm-linux-mtd-36=gmane.org@lists.infradead.org To: Vignesh R , David Woodhouse , Brian Norris , Boris Brezillon , Marek Vasut , Richard Weinberger , Cyrille Pitchen Cc: linux-omap@vger.kernel.org, linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org List-Id: linux-omap@vger.kernel.org On 27/02/2017 13:08, Vignesh R wrote: > 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(-) > I have tested this on a daVinci EVM board with SPI DMA enabled and the UBIFS tests all passed. Thanks, Frode ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/