spi/tegra-sflash: Factor runtime PM out into transfer prepare/unprepare
authorMark Brown <broonie@linaro.org>
Sat, 27 Jul 2013 11:29:58 +0000 (12:29 +0100)
committerMark Brown <broonie@linaro.org>
Mon, 29 Jul 2013 16:12:36 +0000 (17:12 +0100)
commit9f178c22fb0e88f4e84f7a66be8326f63b91e7e3
treefef8c45930e90a6b7106fd14b15e9dd72c44f851
parentbb249aad82b93674281d8b76a0c9be2ba1d92d78
spi/tegra-sflash: Factor runtime PM out into transfer prepare/unprepare

Currently the tegra sflash 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-sflash.c