redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

ARM: 8206/1: dmaengine: pl330: Add PM sleep support 

Add system suspend/resume capabilities to the pl330 driver so the amba
bus clock could be also unprepared to conserve energy.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
hifive-unleashed-5.1
Krzysztof Kozlowski 2014-11-18 12:17:56 +01:00 committed by Russell King
parent ae43b32891
commit b816ccc5c0
1 changed files with 41 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
drivers/dma/pl330.c
View File

@ -2627,6 +2627,46 @@ static int pl330_dma_device_slave_caps(struct dma_chan *dchan,
return 0;
}
/*
* Runtime PM callbacks are provided by amba/bus.c driver.
*
* It is assumed here that IRQ safe runtime PM is chosen in probe and amba
* bus driver will only disable/enable the clock in runtime PM callbacks.
*/
static int __maybe_unused pl330_suspend(struct device *dev)
{
struct amba_device *pcdev = to_amba_device(dev);
pm_runtime_disable(dev);
if (!pm_runtime_status_suspended(dev)) {
/* amba did not disable the clock */
amba_pclk_disable(pcdev);
}
amba_pclk_unprepare(pcdev);
return 0;
}
static int __maybe_unused pl330_resume(struct device *dev)
{
struct amba_device *pcdev = to_amba_device(dev);
int ret;
ret = amba_pclk_prepare(pcdev);
if (ret)
return ret;
if (!pm_runtime_status_suspended(dev))
ret = amba_pclk_enable(pcdev);
pm_runtime_enable(dev);
return ret;
}
static SIMPLE_DEV_PM_OPS(pl330_pm, pl330_suspend, pl330_resume);
static int
pl330_probe(struct amba_device *adev, const struct amba_id *id)
{
@ -2852,6 +2892,7 @@ static struct amba_driver pl330_driver = {
.drv = {
.owner = THIS_MODULE,
.name = "dma-pl330",
.pm = &pl330_pm,
},
.id_table = pl330_ids,
.probe = pl330_probe,