ipq806x: rework L2 cache patch

Rework l2 scaling patch to fix some compile warning
and to imporve the caling timings by removing call to unnecessary
function.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>

target/linux/ipq806x/patches-5.4/0055-cpufreq-dt-Add-L2-frequency-scaling-support.patch

@@ -1,13 +1,25 @@
 --- a/drivers/cpufreq/cpufreq-dt.c
 +++ b/drivers/cpufreq/cpufreq-dt.c
-@@ -48,16 +48,71 @@ static int set_target(struct cpufreq_pol
+@@ -39,20 +39,85 @@ static struct freq_attr *cpufreq_dt_attr
+ 	NULL,
+ };
+
++struct shared_data {
++	unsigned long *curr_freq_table;
++	unsigned long curr_l2_freq;
++	unsigned long curr_l2_volt;
++};
++
++static struct shared_data *cpus_shared_data;
++
+ static int set_target(struct cpufreq_policy *policy, unsigned int index)
  {
  	struct private_data *priv = policy->driver_data;
  	unsigned long freq = policy->freq_table[index].frequency;
 +	struct clk *l2_clk = policy->l2_clk;
 +	struct regulator *l2_regulator = policy->l2_regulator;
 +	unsigned long l2_freq, target_l2_freq;
-+	unsigned long l2_vol, target_l2_vol;
++	unsigned long l2_vol, target_l2_volt;
 +	unsigned long target_freq;
  	int ret;
 
@@ -16,20 +28,19 @@
 
  	if (!ret) {
 +		if (policy->l2_rate_set) {
-+			static unsigned long krait_l2[CONFIG_NR_CPUS] = { };
 +			int cpu, l2_index, tol = 0;
-+
 +			target_freq = freq * 1000;
 +
-+			krait_l2[policy->cpu] = target_freq;
++			cpus_shared_data->curr_freq_table[policy->cpu] = target_freq;
 +			for_each_present_cpu(cpu)
-+				target_freq = max(target_freq, krait_l2[cpu]);
++				if (cpu != policy->cpu)
++					target_freq = max(target_freq, cpus_shared_data->curr_freq_table[cpu]);
 +
-+			for (l2_index = 2; l2_index >= 0; l2_index--)
++			for (l2_index = 2; l2_index > 0; l2_index--)
 +				if (target_freq >= policy->l2_cpufreq[l2_index])
 +					break;
 +
-+			l2_freq = clk_get_rate(l2_clk);
++			l2_freq = cpus_shared_data->curr_l2_freq;
 +			target_l2_freq = policy->l2_rate[l2_index];
 +
 +			if (l2_freq != target_l2_freq) {
@@ -44,21 +55,24 @@
 +					if (ret)
 +						goto exit;
 +				}
++
 +				/* scale l2 with the core */
 +				ret = clk_set_rate(l2_clk, target_l2_freq);
 +				if (ret)
 +					goto exit;
++				cpus_shared_data->curr_l2_freq = target_l2_freq;
 +
 +				if (policy->l2_volt_set) {
 +
-+					l2_vol = regulator_get_voltage(l2_regulator);
-+					target_l2_vol = policy->l2_volt[l2_index];
++					l2_vol = cpus_shared_data->curr_l2_volt;
++					target_l2_volt = policy->l2_volt[l2_index];
 +
-+					if (l2_vol != target_l2_vol) {
-+						tol = target_l2_vol * policy->l2_volt_tol / 100;
-+						ret = regulator_set_voltage_tol(l2_regulator,target_l2_vol,tol);
++					if (l2_vol != target_l2_volt) {
++						tol = target_l2_volt * policy->l2_volt_tol / 100;
++						ret = regulator_set_voltage_tol(l2_regulator,target_l2_volt,tol);
 +						if (ret)
 +							goto exit;
++						cpus_shared_data->curr_l2_volt = target_l2_volt;
 +					}
 +				}
 +			}
@@ -72,7 +86,7 @@
  	mutex_unlock(&priv->lock);
 
  	return ret;
-@@ -200,6 +255,9 @@ static int cpufreq_init(struct cpufreq_p
+@@ -195,6 +260,9 @@ static int cpufreq_init(struct cpufreq_p
  	bool fallback = false;
  	const char *name;
  	int ret;
@@ -82,7 +96,7 @@
 
  	cpu_dev = get_cpu_device(policy->cpu);
  	if (!cpu_dev) {
-@@ -307,6 +365,57 @@ static int cpufreq_init(struct cpufreq_p
+@@ -302,6 +370,57 @@ static int cpufreq_init(struct cpufreq_p
 
  	policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;
 
@@ -140,9 +154,33 @@
  	/* Support turbo/boost mode */
  	if (policy_has_boost_freq(policy)) {
  		/* This gets disabled by core on driver unregister */
+@@ -401,6 +520,14 @@ static int dt_cpufreq_probe(struct platf
+ 	if (ret)
+ 		return ret;
+
++	cpus_shared_data = kzalloc(sizeof(struct shared_data), GFP_KERNEL);
++	if (!cpus_shared_data)
++		return -ENOMEM;
++
++	cpus_shared_data->curr_freq_table = kzalloc(sizeof(int) * CONFIG_NR_CPUS, GFP_KERNEL);
++	if (!cpus_shared_data->curr_freq_table)
++		return -ENOMEM;
++
+ 	if (data) {
+ 		if (data->have_governor_per_policy)
+ 			dt_cpufreq_driver.flags |= CPUFREQ_HAVE_GOVERNOR_PER_POLICY;
+@@ -419,6 +546,8 @@ static int dt_cpufreq_probe(struct platf
+
+ static int dt_cpufreq_remove(struct platform_device *pdev)
+ {
++	kfree(cpus_shared_data->curr_freq_table);
++	kfree(cpus_shared_data);
+ 	cpufreq_unregister_driver(&dt_cpufreq_driver);
+ 	return 0;
+ }
 --- a/include/linux/cpufreq.h
 +++ b/include/linux/cpufreq.h
-@@ -72,7 +72,15 @@ struct cpufreq_policy {
+@@ -58,7 +58,15 @@ struct cpufreq_policy {
  						should set cpufreq */
  	unsigned int		cpu;    /* cpu managing this policy, must be online */