[PATCH v2 0/4] spi: Fix DMA bugs in (not only) spi-s3c64xx

[Vincent Whitchurch <vincent.whitchurch@xxxxxxxx>]

v2:
- Drop merged patch adding new test to spi-loopback-test
- Fix compiler warning in !HAS_DMA builds
- Add support to split transfers to core

This series fixes some bugs I found while running spi-loopback-test with
spi-s3c64xx.  The first problem (which I actually noticed while trying to fix
the second problem with transfers >64KiB) seems to be a generic issue which
affects several drivers so I fixed it in the core.

The series has been tested on ARTPEC-8, which has a version of the IP similar
to Exynos 7 and with 64 byte FIFOs (compatible with "tesla,fsd-spi").

Cc: alim.akhtar@xxxxxxxxxxx
Cc: linux-spi@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-samsung-soc@xxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx

Vincent Whitchurch (4):
  spi: Save current RX and TX DMA devices
  spi: Fix cache corruption due to DMA/PIO overlap
  spi: Split transfers larger than max size
  spi: s3c64xx: Fix large transfers with DMA

 drivers/spi/spi-s3c64xx.c |   9 +++
 drivers/spi/spi.c         | 137 ++++++++++++++++++++++++++++----------
 include/linux/spi/spi.h   |   4 ++
 3 files changed, 114 insertions(+), 36 deletions(-)

-- 
2.34.1