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ARM: tegra: dvfs: Fix locking on external dvfs calls

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Change-Id: I9e3a3cc8c6c4424d7f7ded22d886d51f715ec5d5
Signed-off-by: Colin Cross <ccross@android.com>
This commit is contained in:
Colin Cross
2010-11-08 16:30:11 -08:00
parent 5dd546a463
commit f58886c359
3 changed files with 28 additions and 11 deletions
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35
arch/arm/mach-tegra/clock.c
View File

@@ -207,6 +207,22 @@ void clk_set_cansleep(struct clk *c)
mutex_unlock(&clock_list_lock);
}
int tegra_dvfs_set_rate(struct clk *c, unsigned long rate)
{
unsigned long flags;
int ret;
if (!clk_is_dvfs(c))
return -EINVAL;
clk_lock_save(c, flags);
ret = tegra_dvfs_set_rate_locked(c, rate);
clk_unlock_restore(c, flags);
return ret;
}
EXPORT_SYMBOL(tegra_dvfs_set_rate);
int clk_reparent(struct clk *c, struct clk *parent)
{
c->parent = parent;
@@ -244,7 +260,7 @@ int clk_enable(struct clk *c)
clk_lock_save(c, flags);
if (clk_is_auto_dvfs(c)) {
ret = tegra_dvfs_set_rate(c, clk_get_rate_locked(c));
ret = tegra_dvfs_set_rate_locked(c, clk_get_rate_locked(c));
if (ret)
goto out;
}
@@ -297,7 +313,7 @@ void clk_disable(struct clk *c)
c->refcnt--;
if (clk_is_auto_dvfs(c) && c->refcnt == 0)
tegra_dvfs_set_rate(c, 0);
tegra_dvfs_set_rate_locked(c, 0);
clk_unlock_restore(c, flags);
}
@@ -322,7 +338,7 @@ int clk_set_parent(struct clk *c, struct clk *parent)
if (clk_is_auto_dvfs(c) && c->refcnt > 0 &&
(!c->parent || new_rate > old_rate)) {
ret = tegra_dvfs_set_rate(c, new_rate);
ret = tegra_dvfs_set_rate_locked(c, new_rate);
if (ret)
goto out;
}
@@ -333,7 +349,7 @@ int clk_set_parent(struct clk *c, struct clk *parent)
if (clk_is_auto_dvfs(c) && c->refcnt > 0 &&
new_rate < old_rate)
ret = tegra_dvfs_set_rate(c, new_rate);
ret = tegra_dvfs_set_rate_locked(c, new_rate);
out:
clk_unlock_restore(c, flags);
@@ -366,7 +382,7 @@ int clk_set_rate(struct clk *c, unsigned long rate)
rate = c->max_rate;
if (clk_is_auto_dvfs(c) && rate > old_rate && c->refcnt > 0) {
ret = tegra_dvfs_set_rate(c, rate);
ret = tegra_dvfs_set_rate_locked(c, rate);
if (ret)
goto out;
}
@@ -376,7 +392,7 @@ int clk_set_rate(struct clk *c, unsigned long rate)
goto out;
if (clk_is_auto_dvfs(c) && rate < old_rate && c->refcnt > 0)
ret = tegra_dvfs_set_rate(c, rate);
ret = tegra_dvfs_set_rate_locked(c, rate);
out:
clk_unlock_restore(c, flags);
@@ -527,11 +543,12 @@ void __init tegra_clk_set_dvfs_rates(void)
clk_lock_save(c, flags);
if (clk_is_auto_dvfs(c)) {
if (c->refcnt > 0)
tegra_dvfs_set_rate(c, clk_get_rate_locked(c));
tegra_dvfs_set_rate_locked(c,
clk_get_rate_locked(c));
else
tegra_dvfs_set_rate(c, 0);
tegra_dvfs_set_rate_locked(c, 0);
} else if (clk_is_dvfs(c)) {
tegra_dvfs_set_rate(c, c->dvfs_rate);
tegra_dvfs_set_rate_locked(c, c->dvfs_rate);
}
clk_unlock_restore(c, flags);
}

1
arch/arm/mach-tegra/clock.h
View File

@@ -165,5 +165,6 @@ void tegra_clk_init_from_table(struct tegra_clk_init_table *table);
void tegra_clk_set_dvfs_rates(void);
void clk_set_cansleep(struct clk *c);
unsigned long clk_get_rate_locked(struct clk *c);
int tegra_dvfs_set_rate_locked(struct clk *c, unsigned long rate);
#endif

3
arch/arm/mach-tegra/dvfs.c
View File

@@ -166,7 +166,7 @@ __tegra_dvfs_set_rate(struct clk *c, struct dvfs *d, unsigned long rate)
return ret;
}
int tegra_dvfs_set_rate(struct clk *c, unsigned long rate)
int tegra_dvfs_set_rate_locked(struct clk *c, unsigned long rate)
{
struct dvfs *d;
int ret = 0;
@@ -192,7 +192,6 @@ int tegra_dvfs_set_rate(struct clk *c, unsigned long rate)
return 0;
}
EXPORT_SYMBOL(tegra_dvfs_set_rate);
/* May only be called during clock init, does not take any locks on clock c. */
int __init tegra_enable_dvfs_on_clk(struct clk *c, struct dvfs *d)