From 0ad2deeab5d3fc80fc7cd85638f805830254ef1d Mon Sep 17 00:00:00 2001 From: Virupax Sadashivpetimath Date: Mon, 17 Oct 2011 14:52:47 +0200 Subject: 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 Signed-off-by: Virupax Sadashivpetimath Signed-off-by: Linus Walleij --- drivers/spi/spi-pl022.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'drivers/spi') diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c index d165c0bfcab5..82a929f916fd 100644 --- a/drivers/spi/spi-pl022.c +++ b/drivers/spi/spi-pl022.c @@ -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; -- cgit v1.2.3