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spi/pl022: add support for pm_runtime autosuspend

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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 <[email protected]>
Signed-off-by: Chris Blair <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
This commit is contained in:
Chris Blair 2011-11-08 08:54:46 +00:00 • committed by Linus Walleij
commit 53e4acea0e
2 changed files with 22 additions and 2 deletions
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20
drivers/spi/spi-pl022.c
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@ -1516,7 +1516,13 @@ static void pump_messages(struct work_struct *work)
/* 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);
if (pl022->master_info->autosuspend_delay > 0) {
pm_runtime_mark_last_busy(&pl022->adev->dev);
pm_runtime_put_autosuspend(&pl022->adev->dev);
} else {
pm_runtime_put(&pl022->adev->dev);
}
}
pl022->busy = false;
spin_unlock_irqrestore(&pl022->queue_lock, flags);
@ -2247,7 +2253,17 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
dev_dbg(dev, "probe succeeded\n");
/* let runtime pm put suspend */
pm_runtime_put(dev);
if (platform_info->autosuspend_delay > 0) {
dev_info(&adev->dev,
"will use autosuspend for runtime pm, delay %dms\n",
platform_info->autosuspend_delay);
pm_runtime_set_autosuspend_delay(dev,
platform_info->autosuspend_delay);
pm_runtime_use_autosuspend(dev);
pm_runtime_put_autosuspend(dev);
} else {
pm_runtime_put(dev);
}
return 0;
err_spi_register: