Re: [PATCH 0/2] Put OMAP2 SPI CS in unactive state when return from suspend

[Kevin Hilman <khilman@deeprootsystems.com>]

Gregory CLEMENT <gclement00@gmail.com> writes:

> We notice that when system wake up from OFF mode, then CS is in
> unactive state until the first SPI transfert.
> For our design it lead to some conflict on this I/O.
> Unactive state for CS when there is no transfert shoudl be the correct
> behaviour: this is the purpose of these patches.

This approach handles an off-mode transition during suspend, but if
off-mode is enabled, you can also have an off-mode transition during
idle.

Since you didn't describe what the conflicts you're seeing are, I would
assume that you'll have the same problems in idle as in suspend, and
this series doesn't address the idle case.

Kevin



> Gregory CLEMENT (2):
>   spi: Add hook on suspend/resume for spi master
>   spi/omap2_mcspi: When SPI wake up from OFF mode, CS is in wrong
>     state: force it to unactive state
>
>  drivers/spi/omap2_mcspi.c |   11 ++++++++++-
>  drivers/spi/spi.c         |   15 ++++++++++++++-
>  include/linux/spi/spi.h   |    4 +++-
>  3 files changed, 27 insertions(+), 3 deletions(-)
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