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spi/pl022: disable the PL022 block when unused 

Make sure we clear the enable bit when the block is not used.
This will save some energy in certain hardware versions.

Reviewed-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Virupax Sadashivpetimath 2011-10-17 14:52:47 +02:00 committed by Linus Walleij
parent d4b6af2e0e
commit 0ad2deeab5
1 changed files with 5 additions and 1 deletions
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6
drivers/spi/spi-pl022.c
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@ -1512,8 +1512,12 @@ static void pump_messages(struct work_struct *work)
/* Lock queue and check for queue work */
spin_lock_irqsave(&pl022->queue_lock, flags);
if (list_empty(&pl022->queue) || !pl022->running) {
if (pl022->busy)
if (pl022->busy) {
/* nothing more to do - disable spi/ssp and power off */
writew((readw(SSP_CR1(pl022->virtbase)) &
(~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase));
pm_runtime_put(&pl022->adev->dev);
}
pl022->busy = false;
spin_unlock_irqrestore(&pl022->queue_lock, flags);
return;