summaryrefslogtreecommitdiff
path: root/drivers/amba
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/amba')
-rw-r--r--drivers/amba/Kconfig14
-rw-r--r--drivers/amba/bus.c17
2 files changed, 26 insertions, 5 deletions
diff --git a/drivers/amba/Kconfig b/drivers/amba/Kconfig
new file mode 100644
index 000000000000..4a5c9d279059
--- /dev/null
+++ b/drivers/amba/Kconfig
@@ -0,0 +1,14 @@
+config ARM_AMBA
+ bool
+
+if ARM_AMBA
+
+config TEGRA_AHB
+ bool "Enable AHB driver for NVIDIA Tegra SoCs"
+ default y if ARCH_TEGRA
+ help
+ Adds AHB configuration functionality for NVIDIA Tegra SoCs,
+ which controls AHB bus master arbitration and some performance
+ parameters (priority, prefetch size).
+
+endif
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index 47bbdc1b5be3..80f4de729a86 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -95,8 +95,12 @@ static int amba_pm_runtime_suspend(struct device *dev)
struct amba_device *pcdev = to_amba_device(dev);
int ret = pm_generic_runtime_suspend(dev);
- if (ret == 0 && dev->driver)
- clk_disable_unprepare(pcdev->pclk);
+ if (ret == 0 && dev->driver) {
+ if (pm_runtime_is_irq_safe(dev))
+ clk_disable(pcdev->pclk);
+ else
+ clk_disable_unprepare(pcdev->pclk);
+ }
return ret;
}
@@ -107,7 +111,10 @@ static int amba_pm_runtime_resume(struct device *dev)
int ret;
if (dev->driver) {
- ret = clk_prepare_enable(pcdev->pclk);
+ if (pm_runtime_is_irq_safe(dev))
+ ret = clk_enable(pcdev->pclk);
+ else
+ ret = clk_prepare_enable(pcdev->pclk);
/* Failure is probably fatal to the system, but... */
if (ret)
return ret;
@@ -115,7 +122,7 @@ static int amba_pm_runtime_resume(struct device *dev)
return pm_generic_runtime_resume(dev);
}
-#endif
+#endif /* CONFIG_PM */
static const struct dev_pm_ops amba_pm = {
.suspend = pm_generic_suspend,
@@ -124,7 +131,7 @@ static const struct dev_pm_ops amba_pm = {
.thaw = pm_generic_thaw,
.poweroff = pm_generic_poweroff,
.restore = pm_generic_restore,
- SET_PM_RUNTIME_PM_OPS(
+ SET_RUNTIME_PM_OPS(
amba_pm_runtime_suspend,
amba_pm_runtime_resume,
NULL