Re: [PATCH 0/3] mtd: spi-nor: fix DMA-unsafe buffer issue between MTD and SPI

From: Vignesh R
Date: Fri Dec 29 2017 - 04:18:53 EST

On Wednesday 27 December 2017 12:15 AM, Trent Piepho wrote:
> On Sun, 2017-12-24 at 05:36 +0100, Cyrille Pitchen wrote:
>> this series tries to solve a long time issue of compatibility between the
>> MTD and SPI sub-systems about whether we should use DMA-safe memory.
> Can this should replace SoC specific fixes like:
> c687c46e9e45
> spi: spi-ti-qspi: Use bounce buffer if read buffer is not DMA'ble

Yes, I plan to revert this patch once m25p80 starts using bounce buffers.

I am interested in knowing which other SPI clients end up passing non
DMA'able buffers. AFAIK, its UBIFS and JFFS2. Most other SPI devices on
TI boards that I have dealt with like Touch, Sensors (IIO), GPIO
expanders etc all provide DMA'able buffers.