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>
diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index d165c0b..82a929f 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -1512,8 +1512,12 @@
/* 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;