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authorJames Cosin <jkosin@intcomgrp.com>2012-08-20 11:55:36 +0800
committerBob Liu <lliubbo@gmail.com>2012-10-08 14:36:29 +0800
commit810f1512dc8a1f64c22229c3def85fc398b6a24f (patch)
tree3102b28e57030bacaee88a758710bc68dd20821c /arch/blackfin
parentce8609146d09df213ed1e842ece7ad477e0ab7a6 (diff)
downloadop-kernel-dev-810f1512dc8a1f64c22229c3def85fc398b6a24f.zip
op-kernel-dev-810f1512dc8a1f64c22229c3def85fc398b6a24f.tar.gz
Blackfin: cpufreq: fix dpm_state_table
This patch fixes an assumption that cclk's initial divisor will always be 1 (or 0 in the register). TSCALE is always initialized on startup with a value of 4 regardless of the inital cclk divisor; so, we can't make the assumption without making lots of other assumptions. The TPERIOD value is set with a value of the current cclk (value / (HZ * TSCALE)) - 1; so, we need to adjust based on this initial frequency and not use cclk's initial divisor for adjusting the tscale. Signed-off-by: Steven Miao <realmz6@gmail.com> Signed-off-by: Bob Liu <lliubbo@gmail.com>
Diffstat (limited to 'arch/blackfin')
-rw-r--r--arch/blackfin/mach-common/cpufreq.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/blackfin/mach-common/cpufreq.c b/arch/blackfin/mach-common/cpufreq.c
index c854a27..65a4511 100644
--- a/arch/blackfin/mach-common/cpufreq.c
+++ b/arch/blackfin/mach-common/cpufreq.c
@@ -77,15 +77,14 @@ static void __init bfin_init_tables(unsigned long cclk, unsigned long sclk)
csel = bfin_read32(CGU0_DIV) & 0x1F;
#endif
- for (index = 0; (cclk >> index) >= min_cclk && csel <= 3; index++, csel++) {
+ for (index = 0; (cclk >> index) >= min_cclk && csel <= 3 && index < 3; index++, csel++) {
bfin_freq_table[index].frequency = cclk >> index;
#ifndef CONFIG_BF60x
dpm_state_table[index].csel = csel << 4; /* Shift now into PLL_DIV bitpos */
- dpm_state_table[index].tscale = (TIME_SCALE / (1 << csel)) - 1;
#else
dpm_state_table[index].csel = csel;
- dpm_state_table[index].tscale = TIME_SCALE >> index;
#endif
+ dpm_state_table[index].tscale = (TIME_SCALE >> index) - 1;
pr_debug("cpufreq: freq:%d csel:0x%x tscale:%d\n",
bfin_freq_table[index].frequency,
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