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PM / OPP: fix the errors occurred during getting or setting voltage

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Change-Id: Iae0695d780b7f8f75c6d49bde5ee09beb04e1d80
Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>
This commit is contained in:
Finley Xiao 2016-12-09 11:34:03 +08:00 committed by Huang, Tao
parent 3b72af3ea7
commit 1949a7b99a
1 changed files with 9 additions and 0 deletions
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9
drivers/base/power/opp/core.c
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@ -737,6 +737,11 @@ int dev_pm_opp_check_initial_rate(struct device *dev, unsigned long *cur_freq)
clk = opp_table->clk;
reg = opp_table->regulator;
if (IS_ERR_OR_NULL(clk) || IS_ERR_OR_NULL(reg)) {
dev_err(dev, "clk or regulater is unavailable\n");
rcu_read_unlock();
return -EINVAL;
}
old_freq = clk_get_rate(clk);
*cur_freq = old_freq;
@ -761,6 +766,10 @@ int dev_pm_opp_check_initial_rate(struct device *dev, unsigned long *cur_freq)
target_freq = clk_round_rate(clk, target_freq);
old_volt = regulator_get_voltage(reg);
if (old_volt <= 0) {
dev_err(dev, "failed to get volt %d\n", old_volt);
return -EINVAL;
}
dev_dbg(dev, "%lu Hz %d uV --> %lu Hz %lu uV\n", old_freq, old_volt,
target_freq, u_volt);