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Robin Gong 809b1b04df
spi: introduce fallback to pio
Add fallback to pio mode in case dma transfer failed with error status
SPI_TRANS_FAIL_NO_START.
If spi client driver want to enable this feature please set xfer->error in
the proper place such as dmaengine_prep_slave_sg() failure detect(but no
any data put into spi bus yet). Besides, add master->fallback checking in
its can_dma() so that spi core could switch to pio next time. Please refer
to spi-imx.c.

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Link: https://lore.kernel.org/r/1592347329-28363-2-git-send-email-yibin.gong@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2020-06-23 13:38:14 +01:00
arch
block
certs
crypto
Documentation spi: renesas,sh-msiof: Add r8a7742 support 2020-06-15 23:56:32 +01:00
drivers spi: introduce fallback to pio 2020-06-23 13:38:14 +01:00
fs
include spi: introduce fallback to pio 2020-06-23 13:38:14 +01:00
init
ipc
kernel Add additional LSM hooks for SafeSetID 2020-06-14 11:39:31 -07:00
lib
LICENSES
mm
net
samples
scripts
security Add additional LSM hooks for SafeSetID 2020-06-14 11:39:31 -07:00
sound
tools Merge existing fixes from spi/for-5.8 2020-06-15 16:16:05 +01:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS
Makefile Linux 5.8-rc1 2020-06-14 12:45:04 -07:00
README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.