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cpufreq: tegra20: Remove EMC clock usage 

The EMC driver has been gone 4 years ago, since the commit a7cbe92cef
("ARM: tegra: remove tegra EMC scaling driver"). Remove the EMC clock
usage as it does nothing. We may consider re-implementing the EMC scaling
later, probably using PM Memory Bandwidth QoS API.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dmitry Osipenko 2018-05-18 23:06:35 +03:00 committed by Rafael J. Wysocki
parent 9a25ba9a15
commit 9b633cb621
1 changed files with 0 additions and 22 deletions
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22
drivers/cpufreq/tegra20-cpufreq.c
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@ -40,7 +40,6 @@ static struct cpufreq_frequency_table freq_table[] = {
static struct clk *cpu_clk;
static struct clk *pll_x_clk;
static struct clk *pll_p_clk;
static struct clk *emc_clk;
static bool pll_x_prepared;
static unsigned int tegra_get_intermediate(struct cpufreq_policy *policy,
@ -91,17 +90,6 @@ static int tegra_target(struct cpufreq_policy *policy, unsigned int index)
unsigned int ifreq = clk_get_rate(pll_p_clk) / 1000;
int ret = 0;
/*
* Vote on memory bus frequency based on cpu frequency
* This sets the minimum frequency, display or avp may request higher
*/
if (rate >= 816000)
clk_set_rate(emc_clk, 600000000); /* cpu 816 MHz, emc max */
else if (rate >= 456000)
clk_set_rate(emc_clk, 300000000); /* cpu 456 MHz, emc 150Mhz */
else
clk_set_rate(emc_clk, 100000000); /* emc 50Mhz */
/*
* target freq == pll_p, don't need to take extra reference to pll_x_clk
* as it isn't used anymore.
@ -137,14 +125,12 @@ static int tegra_cpu_init(struct cpufreq_policy *policy)
if (policy->cpu >= NUM_CPUS)
return -EINVAL;
clk_prepare_enable(emc_clk);
clk_prepare_enable(cpu_clk);
/* FIXME: what's the actual transition time? */
ret = cpufreq_generic_init(policy, freq_table, 300 * 1000);
if (ret) {
clk_disable_unprepare(cpu_clk);
clk_disable_unprepare(emc_clk);
return ret;
}
@ -156,7 +142,6 @@ static int tegra_cpu_init(struct cpufreq_policy *policy)
static int tegra_cpu_exit(struct cpufreq_policy *policy)
{
clk_disable_unprepare(cpu_clk);
clk_disable_unprepare(emc_clk);
return 0;
}
@ -188,19 +173,12 @@ static int __init tegra_cpufreq_init(void)
if (IS_ERR(pll_p_clk))
return PTR_ERR(pll_p_clk);
emc_clk = clk_get_sys("cpu", "emc");
if (IS_ERR(emc_clk)) {
clk_put(cpu_clk);
return PTR_ERR(emc_clk);
}
return cpufreq_register_driver(&tegra_cpufreq_driver);
}
static void __exit tegra_cpufreq_exit(void)
{
cpufreq_unregister_driver(&tegra_cpufreq_driver);
clk_put(emc_clk);
clk_put(cpu_clk);
}