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

[Vignesh R <vigneshr@xxxxxx>]

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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