On 08/29, Viresh Kumar wrote:

On 18-08-16, 16:52, Finlye Xiao wrote:

quoted

+static int rockchip_adjust_opp_table(struct device *cpu_dev,
+				     struct cpufreq_frequency_table *table,
+				     int volt)
+{
+	struct opp_table *opp_table;
+	struct cpufreq_frequency_table *pos;
+	struct dev_pm_opp *opp;
+
+	if (!volt)
+		return 0;
+
+	rcu_read_lock();
+
+	opp_table = _find_opp_table(cpu_dev);
+	if (IS_ERR(opp_table)) {
+		rcu_read_unlock();
+		return PTR_ERR(opp_table);
+	}
+
+	cpufreq_for_each_valid_entry(pos, table) {
+		opp = dev_pm_opp_find_freq_exact(cpu_dev, pos->frequency * 1000,
+						 true);
+		if (IS_ERR(opp))
+			continue;
+
+		opp->u_volt += volt;
+		opp->u_volt_min += volt;
+		opp->u_volt_max += volt;
+	}
+
+	rcu_read_unlock();
+
+	return 0;
+}

I wouldn't prefer altering the opp tables from individual drivers at all. At the
least, it should be done via some helpers exposed by the core.

But before that I would like to hear from Stephen a bit as I recall he was also
working on something similar.

I had a patch to modify the voltage at runtime for the "current"
OPP. Now that we have regulator and clk control inside OPP that
became a little easier to do without having to do some notifier
from the OPP layer to the consumers. I haven't had time to revive
those patches though. Should we do that? Does this need to modify
anything besides the OPP the device is currently running at?

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