diff options
| author | Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com> | 2011-10-17 14:52:47 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2011-12-01 17:16:08 +0100 |
| commit | 0ad2deeab5d3fc80fc7cd85638f805830254ef1d (patch) | |
| tree | b413887d19ad0bbf2ae970f4ef55cd5e1679262a /drivers/spi | |
| parent | spi/pl022: move device disable to workqueue thread (diff) | |
| download | linux-0ad2deeab5d3fc80fc7cd85638f805830254ef1d.tar.xz linux-0ad2deeab5d3fc80fc7cd85638f805830254ef1d.zip | |
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>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-pl022.c | 6 |
1 files changed, 5 insertions, 1 deletions
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; |