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cpufreq: armada-37xx: fix frequency calculation for opp 

The frequency calculation was based on the current(max) frequency of the
CPU. However for low frequency, the value used was already the parent
frequency divided by a factor of 2.

Instead of using this frequency, this fix directly get the frequency from
the parent clock.

Fixes: 92ce45fb87 ("cpufreq: Add DVFS support for Armada 37xx")
Cc: <stable@vger.kernel.org>
Reported-by: Christian Neubert <christian.neubert.86@gmail.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Gregory CLEMENT 2019-03-08 17:47:10 +01:00 committed by Viresh Kumar
parent c1d1090c3c
commit 8db8256345
1 changed files with 19 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/cpufreq/armada-37xx-cpufreq.c
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@ -359,11 +359,11 @@ static int __init armada37xx_cpufreq_driver_init(void)
struct armada_37xx_dvfs *dvfs;
struct platform_device *pdev;
unsigned long freq;
unsigned int cur_frequency;
unsigned int cur_frequency, base_frequency;
struct regmap *nb_pm_base, *avs_base;
struct device *cpu_dev;
int load_lvl, ret;
struct clk *clk;
struct clk *clk, *parent;
nb_pm_base =
syscon_regmap_lookup_by_compatible("marvell,armada-3700-nb-pm");
@ -399,6 +399,22 @@ static int __init armada37xx_cpufreq_driver_init(void)
return PTR_ERR(clk);
}
parent = clk_get_parent(clk);
if (IS_ERR(parent)) {
dev_err(cpu_dev, "Cannot get parent clock for CPU0\n");
clk_put(clk);
return PTR_ERR(parent);
}
/* Get parent CPU frequency */
base_frequency = clk_get_rate(parent);
if (!base_frequency) {
dev_err(cpu_dev, "Failed to get parent clock rate for CPU\n");
clk_put(clk);
return -EINVAL;
}
/* Get nominal (current) CPU frequency */
cur_frequency = clk_get_rate(clk);
if (!cur_frequency) {
@ -431,7 +447,7 @@ static int __init armada37xx_cpufreq_driver_init(void)
for (load_lvl = ARMADA_37XX_DVFS_LOAD_0; load_lvl < LOAD_LEVEL_NR;
load_lvl++) {
unsigned long u_volt = avs_map[dvfs->avs[load_lvl]] * 1000;
freq = cur_frequency / dvfs->divider[load_lvl];
freq = base_frequency / dvfs->divider[load_lvl];
ret = dev_pm_opp_add(cpu_dev, freq, u_volt);
if (ret)
goto remove_opp;