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ARM: tegra: dvfs: Add lock to dvfs_reg

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Change-Id: I0496cf37da3a20d697eb4f372c32d01d49352f98
Signed-off-by: Colin Cross <ccross@android.com>
This commit is contained in:
Colin Cross
2010-11-08 16:30:48 -08:00
parent f58886c359
commit d50e318877
1 changed files with 15 additions and 3 deletions
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18
arch/arm/mach-tegra/dvfs.c
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@@ -40,6 +40,7 @@ struct dvfs_reg {
struct regulator *reg;
int max_millivolts;
int millivolts;
struct mutex lock;
};
static LIST_HEAD(dvfs_debug_list);
@@ -52,22 +53,29 @@ static int dvfs_reg_set_voltage(struct dvfs_reg *dvfs_reg)
{
int millivolts = 0;
struct dvfs *d;
int ret = 0;
mutex_lock(&dvfs_reg->lock);
list_for_each_entry(d, &dvfs_reg->dvfs, reg_node)
millivolts = max(d->cur_millivolts, millivolts);
if (millivolts == dvfs_reg->millivolts)
return 0;
goto out;
dvfs_reg->millivolts = millivolts;
if (!dvfs_reg->reg) {
pr_warn("dvfs set voltage on %s ignored\n", dvfs_reg->reg_id);
return 0;
goto out;
}
return regulator_set_voltage(dvfs_reg->reg,
ret = regulator_set_voltage(dvfs_reg->reg,
millivolts * 1000, dvfs_reg->max_millivolts * 1000);
out:
mutex_unlock(&dvfs_reg->lock);
return ret;
}
static int dvfs_reg_connect_to_regulator(struct dvfs_reg *dvfs_reg)
@@ -101,6 +109,7 @@ static struct dvfs_reg *get_dvfs_reg(struct dvfs *d)
goto out;
}
mutex_init(&dvfs_reg->lock);
INIT_LIST_HEAD(&dvfs_reg->dvfs);
dvfs_reg->reg_id = kstrdup(d->reg_id, GFP_KERNEL);
@@ -119,12 +128,15 @@ static struct dvfs_reg *attach_dvfs_reg(struct dvfs *d)
if (!dvfs_reg)
return NULL;
mutex_lock(&dvfs_reg->lock);
list_add_tail(&d->reg_node, &dvfs_reg->dvfs);
d->dvfs_reg = dvfs_reg;
if (d->max_millivolts > d->dvfs_reg->max_millivolts)
d->dvfs_reg->max_millivolts = d->max_millivolts;
d->cur_millivolts = d->max_millivolts;
mutex_unlock(&dvfs_reg->lock);
return dvfs_reg;
}