linux_dsm_epyc7002/drivers/i2c
Fabio Estevam d6e102f498 i2c: i2c-mxs: Use DMA mode even for small transfers
Recently we have been seing some reports about PIO mode not working properly.

- http://www.spinics.net/lists/linux-i2c/msg11985.html
- http://marc.info/?l=linux-i2c&m=137235593101385&w=2
- https://lkml.org/lkml/2013/6/24/430

Let's use DMA mode even for small transfers.

Without this patch, i2c reads the incorrect sgtl5000 version on a mx28evk when
touchscreen is enabled:

[    5.856270] sgtl5000 0-000a: Device with ID register 0 is not a sgtl5000
[    9.877307] sgtl5000 0-000a: ASoC: failed to probe CODEC -19
[    9.883528] mxs-sgtl5000 sound.12: ASoC: failed to instantiate card -19
[    9.892955] mxs-sgtl5000 sound.12: snd_soc_register_card failed (-19)

Cc: <stable@vger.kernel.org>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Marek Vasut <marex@denx.de>

[wsa: we have a proper solution for -next, so this non intrusive
solution is OK for now]

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-05 10:09:12 +02:00
..
algos Linux 3.6-rc7 2012-10-08 12:46:32 +02:00
busses i2c: i2c-mxs: Use DMA mode even for small transfers 2013-08-05 10:09:12 +02:00
muxes Removal of GENERIC_GPIO for v3.10 2013-05-09 09:59:16 -07:00
i2c-boardinfo.c i2c: Update the FSF address 2012-03-26 21:47:19 +02:00
i2c-core.c Revert "i2c: core: make it possible to match a pure device tree driver" 2013-06-18 18:02:45 +02:00
i2c-core.h i2c: Update the FSF address 2012-03-26 21:47:19 +02:00
i2c-dev.c new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
i2c-mux.c i2c: Make the return type of i2c_del_mux_adapter() void 2013-04-02 07:07:32 +02:00
i2c-smbus.c i2c-smbus: Convert kzalloc to devm_kzalloc 2012-10-05 22:23:52 +02:00
i2c-stub.c i2c-stub: Move to drivers/i2c 2012-10-28 21:37:00 +01:00
Kconfig drivers/i2c: remove !S390 dependency, add missing GENERIC_HARDIRQS dependencies 2013-03-11 09:59:02 +01:00
Makefile i2c-stub: Move to drivers/i2c 2012-10-28 21:37:00 +01:00