spi/tegra-slink: Factor runtime PM out into transfer prepare/unprepare
authorMark Brown <broonie@linaro.org>
Sat, 27 Jul 2013 11:34:24 +0000 (12:34 +0100)
committerMark Brown <broonie@linaro.org>
Mon, 29 Jul 2013 16:12:38 +0000 (17:12 +0100)
commitbafe886936a8982f5780330c901889a37bba7d4c
tree1bbc35e208a96dfb0258c2087c984d376a1b9c9e
parent9f178c22fb0e88f4e84f7a66be8326f63b91e7e3
spi/tegra-slink: Factor runtime PM out into transfer prepare/unprepare

Currently the tegra slink driver acquires a runtime PM reference for the
duration of each transfer. This may result in the IP being powered down
between transfers which would be at best wasteful. Instead it is better
to do this in the callbacks that are generated before and after starting
a series of transfers, keeping the IP powered throughout.

Signed-off-by: Mark Brown <broonie@linaro.org>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
drivers/spi/spi-tegra20-slink.c