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| author | Chris Blair <chris.blair@stericsson.com> | 2011-11-08 08:54:46 +0000 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2011-12-01 17:16:08 +0100 |
| commit | 53e4acea0e819a6a8513e10a0773f2259ede0481 (patch) | |
| tree | 621636e14849593e0d2381ee20124309ac624713 /include/linux/amba | |
| parent | 0ad2deeab5d3fc80fc7cd85638f805830254ef1d (diff) | |
| download | lwn-53e4acea0e819a6a8513e10a0773f2259ede0481.tar.gz lwn-53e4acea0e819a6a8513e10a0773f2259ede0481.zip | |
spi/pl022: add support for pm_runtime autosuspend
Adds support for configuring the spi bus to use autosuspend for
runtime power management. This can reduce the latency in starting an
spi transfer by not suspending the device immediately following
completion of a transfer. If another transfer then takes place before
the autosuspend timeout, the call to resume the device can return
immediately rather than needing to risk sleeping in order to resume
the device.
Reviewed-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Chris Blair <chris.blair@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'include/linux/amba')
| -rw-r--r-- | include/linux/amba/pl022.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/amba/pl022.h b/include/linux/amba/pl022.h index 4ce98f54186b..572f637299c9 100644 --- a/include/linux/amba/pl022.h +++ b/include/linux/amba/pl022.h @@ -238,6 +238,9 @@ struct dma_chan; * @enable_dma: if true enables DMA driven transfers. * @dma_rx_param: parameter to locate an RX DMA channel. * @dma_tx_param: parameter to locate a TX DMA channel. + * @autosuspend_delay: delay in ms following transfer completion before the + * runtime power management system suspends the device. A setting of 0 + * indicates no delay and the device will be suspended immediately. */ struct pl022_ssp_controller { u16 bus_id; @@ -246,6 +249,7 @@ struct pl022_ssp_controller { bool (*dma_filter)(struct dma_chan *chan, void *filter_param); void *dma_rx_param; void *dma_tx_param; + int autosuspend_delay; }; /** |