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path: root/drivers/hwspinlock/omap_hwspinlock.c
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Diffstat (limited to 'drivers/hwspinlock/omap_hwspinlock.c')
-rw-r--r--drivers/hwspinlock/omap_hwspinlock.c27
1 files changed, 20 insertions, 7 deletions
diff --git a/drivers/hwspinlock/omap_hwspinlock.c b/drivers/hwspinlock/omap_hwspinlock.c
index 292869cc9034..c1e2cd4d85fe 100644
--- a/drivers/hwspinlock/omap_hwspinlock.c
+++ b/drivers/hwspinlock/omap_hwspinlock.c
@@ -98,10 +98,29 @@ static int omap_hwspinlock_probe(struct platform_device *pdev)
if (!io_base)
return -ENOMEM;
+ /*
+ * make sure the module is enabled and clocked before reading
+ * the module SYSSTATUS register
+ */
+ pm_runtime_enable(&pdev->dev);
+ ret = pm_runtime_get_sync(&pdev->dev);
+ if (ret < 0) {
+ pm_runtime_put_noidle(&pdev->dev);
+ goto iounmap_base;
+ }
+
/* Determine number of locks */
i = readl(io_base + SYSSTATUS_OFFSET);
i >>= SPINLOCK_NUMLOCKS_BIT_OFFSET;
+ /*
+ * runtime PM will make sure the clock of this module is
+ * enabled again iff at least one lock is requested
+ */
+ ret = pm_runtime_put(&pdev->dev);
+ if (ret < 0)
+ goto iounmap_base;
+
/* one of the four lsb's must be set, and nothing else */
if (hweight_long(i & 0xf) != 1 || i > 8) {
ret = -EINVAL;
@@ -121,12 +140,6 @@ static int omap_hwspinlock_probe(struct platform_device *pdev)
for (i = 0, hwlock = &bank->lock[0]; i < num_locks; i++, hwlock++)
hwlock->priv = io_base + LOCK_BASE_OFFSET + sizeof(u32) * i;
- /*
- * runtime PM will make sure the clock of this module is
- * enabled iff at least one lock is requested
- */
- pm_runtime_enable(&pdev->dev);
-
ret = hwspin_lock_register(bank, &pdev->dev, &omap_hwspinlock_ops,
pdata->base_id, num_locks);
if (ret)
@@ -135,9 +148,9 @@ static int omap_hwspinlock_probe(struct platform_device *pdev)
return 0;
reg_fail:
- pm_runtime_disable(&pdev->dev);
kfree(bank);
iounmap_base:
+ pm_runtime_disable(&pdev->dev);
iounmap(io_base);
return ret;
}