diff options
| author | Ranjani Vaidyanathan <ra5478@freescale.com> | 2011-12-06 12:27:18 -0600 |
|---|---|---|
| committer | Jason Liu <r64343@freescale.com> | 2012-01-09 21:09:42 +0800 |
| commit | 87b4fd0b9314f965edeacaa36802029c0633e69c (patch) | |
| tree | 19d14cb44ae7082143fc4d78732ea843dfa9e02f /arch/arm/plat-mxc/dvfs_core.c | |
| parent | 145493838e4f5518798db048ac3b95311f433460 (diff) | |
ENGR00163052: CPUFREQ does not report correct frequency
When DVFS_CORE is enabled, the following command reports incorrect frequency:
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
Fix this by ensuring the CPUFREQ does not change the frequency
when DVFS_CORE is active. And DVFS-CORE informs CPUFREQ of the
change done to CPU frequency.
Signed-off-by: Ranjani Vaidyanathan <ra5478@freescale.com>
Diffstat (limited to 'arch/arm/plat-mxc/dvfs_core.c')
| -rwxr-xr-x | arch/arm/plat-mxc/dvfs_core.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/arch/arm/plat-mxc/dvfs_core.c b/arch/arm/plat-mxc/dvfs_core.c index 006530416edd..183a6dd4b0bf 100755 --- a/arch/arm/plat-mxc/dvfs_core.c +++ b/arch/arm/plat-mxc/dvfs_core.c @@ -84,6 +84,7 @@ #define CCM_CDCR_ARM_FREQ_SHIFT_DIVIDER 0x4 #define CCM_CDHIPR_ARM_PODF_BUSY 0x10000 +int cpufreq_trig_needed; int dvfs_core_is_active; static struct mxc_dvfs_platform_data *dvfs_data; static struct device *dvfs_dev; @@ -98,7 +99,6 @@ static int maxf; static int minf; extern void setup_pll(void); -extern int cpufreq_trig_needed; extern int (*set_cpu_voltage)(u32 cpu_volt); struct timeval core_prev_intr; @@ -485,12 +485,12 @@ static int start_dvfs(void) reg = __raw_readl(dvfs_data->membase + MXC_DVFSCORE_CNTR); /* FSVAIM=0 */ reg = (reg & ~MXC_DVFSCNTR_FSVAIM); + /* Set MAXF, MINF */ - if (!cpu_is_mx6q()) { - reg = (reg & ~(MXC_DVFSCNTR_MAXF_MASK - | MXC_DVFSCNTR_MINF_MASK)); - reg |= 1 << MXC_DVFSCNTR_MAXF_OFFSET; - } + reg = (reg & ~(MXC_DVFSCNTR_MAXF_MASK + | MXC_DVFSCNTR_MINF_MASK)); + reg |= 1 << MXC_DVFSCNTR_MAXF_OFFSET; + /* Select ARM domain */ reg |= MXC_DVFSCNTR_DVFIS; /* Enable DVFS frequency adjustment interrupt */ @@ -526,7 +526,6 @@ static int start_dvfs(void) spin_unlock_irqrestore(&mxc_dvfs_core_lock, flags); printk(KERN_DEBUG "DVFS is started\n"); - return 0; } @@ -667,6 +666,11 @@ END: dvfs_cpu_jiffies(old_loops_per_jiffy, curr_cpu/1000, clk_get_rate(cpu_clk) / 1000); #endif +#if defined (CONFIG_CPU_FREQ) + /* Fix CPU frequency for CPUFREQ. */ + for (cpu = 0; cpu < num_online_cpus(); cpu++) + cpufreq_get(cpu); +#endif cpufreq_trig_needed = 0; } @@ -734,6 +738,11 @@ void stop_dvfs(void) curr_cpu/1000, clk_get_rate(cpu_clk) / 1000); #endif +#if defined (CONFIG_CPU_FREQ) + /* Fix CPU frequency for CPUFREQ. */ + for (cpu = 0; cpu < num_online_cpus(); cpu++) + cpufreq_get(cpu); +#endif } spin_lock_irqsave(&mxc_dvfs_core_lock, flags); |