On Thu, 2013-11-14 at 09:18 +0100, Holger Brunck wrote:
Hi Scott,
On 11/14/2013 02:31 AM, Scott Wood wrote:
On Mon, Aug 26, 2013 at 02:10:56PM +0200, Phil Sutter wrote:
From: Nico Erfurth ne@erfurth.eu
The basic idea is taken from the linux-kernel, but further optimized.
First align the buffer to 8 bytes, then use ldrd/strd to read and store in 8 byte quantities, then do the final bytes.
Tested using: 'date ; nand read.raw 0xE00000 0x0 0x10000 ; date'. Without this patch, NAND read of 132MB took 49s (~2.69MB/s). With this patch in place, reading the same amount of data was done in 27s (~4.89MB/s). So read performance is increased by ~80%!
Signed-off-by: Nico Erfurth ne@erfurth.eu Tested-by: Phil Sutter phil.sutter@viprinet.com Cc: Prafulla Wadaskar prafulla@marvell.com
Changed since V3:
- fixed author
drivers/mtd/nand/kirkwood_nand.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+)
I tried to build-test this, and I couldn't find any board that defines CONFIG_NAND_KIRKWOOD.
it's not in board specific code defined it's defined in a common kirkwood header:
arch/arm/include/asm/arch-kirkwood/config.h:58:#define CONFIG_NAND_KIRKWOOD
Oops. I thought I grepped the whole tree rather than just include/, but apparently not.
-Scott