diff options
Diffstat (limited to 'drivers/clk/clk.c')
| -rw-r--r-- | drivers/clk/clk.c | 35 |
1 files changed, 26 insertions, 9 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index f13c3f4228d4..b4db67a446c8 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -1443,6 +1443,15 @@ static void clk_change_rate(struct clk_core *core) else if (core->parent) best_parent_rate = core->parent->rate; + if (core->flags & CLK_SET_RATE_UNGATE) { + unsigned long flags; + + clk_core_prepare(core); + flags = clk_enable_lock(); + clk_core_enable(core); + clk_enable_unlock(flags); + } + if (core->new_parent && core->new_parent != core->parent) { old_parent = __clk_set_parent_before(core, core->new_parent); trace_clk_set_parent(core, core->new_parent); @@ -1469,6 +1478,15 @@ static void clk_change_rate(struct clk_core *core) core->rate = clk_recalc(core, best_parent_rate); + if (core->flags & CLK_SET_RATE_UNGATE) { + unsigned long flags; + + flags = clk_enable_lock(); + clk_core_disable(core); + clk_enable_unlock(flags); + clk_core_unprepare(core); + } + if (core->notifier_count && old_rate != core->rate) __clk_notify(core, POST_RATE_CHANGE, old_rate, core->rate); @@ -1944,7 +1962,7 @@ bool clk_is_match(const struct clk *p, const struct clk *q) if (p == q) return true; - /* true if clk->core pointers match. Avoid derefing garbage */ + /* true if clk->core pointers match. Avoid dereferencing garbage */ if (!IS_ERR_OR_NULL(p) && !IS_ERR_OR_NULL(q)) if (p->core == q->core) return true; @@ -2482,7 +2500,7 @@ struct clk *__clk_create_clk(struct clk_hw *hw, const char *dev_id, struct clk *clk; /* This is to allow this function to be chained to others */ - if (!hw || IS_ERR(hw)) + if (IS_ERR_OR_NULL(hw)) return (struct clk *) hw; clk = kzalloc(sizeof(*clk), GFP_KERNEL); @@ -2806,10 +2824,9 @@ void __clk_put(struct clk *clk) * re-enter into the clk framework by calling any top-level clk APIs; * this will cause a nested prepare_lock mutex. * - * In all notification cases cases (pre, post and abort rate change) the - * original clock rate is passed to the callback via struct - * clk_notifier_data.old_rate and the new frequency is passed via struct - * clk_notifier_data.new_rate. + * In all notification cases (pre, post and abort rate change) the original + * clock rate is passed to the callback via struct clk_notifier_data.old_rate + * and the new frequency is passed via struct clk_notifier_data.new_rate. * * clk_notifier_register() must be called from non-atomic context. * Returns -EINVAL if called with null arguments, -ENOMEM upon @@ -3062,9 +3079,6 @@ const char *of_clk_get_parent_name(struct device_node *np, int index) int count; struct clk *clk; - if (index < 0) - return NULL; - rc = of_parse_phandle_with_args(np, "clocks", "#clock-cells", index, &clkspec); if (rc) @@ -3083,6 +3097,9 @@ const char *of_clk_get_parent_name(struct device_node *np, int index) } count++; } + /* We went off the end of 'clock-indices' without finding it */ + if (prop && !vp) + return NULL; if (of_property_read_string_index(clkspec.np, "clock-output-names", index, |