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authorDirk Brandewie <dirk.j.brandewie@intel.com>2013-10-21 09:20:35 -0700
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-10-25 23:46:10 +0200
commit19e77c28dbf1972305da0dfeb92a62f83df3a91d (patch)
tree48348ff456ca427844e4e162bc1329b08b140a03 /drivers
parent016c815084d5b89f7c1a24b1a3a0b796512a91bc (diff)
downloadleg-kernel-19e77c28dbf1972305da0dfeb92a62f83df3a91d.tar.gz
intel_pstate: Add Baytrail support
Add support for the Baytrail processor. Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/cpufreq/intel_pstate.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 6b37c9ff1d64..27c2753909fe 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -33,6 +33,8 @@
#define SAMPLE_COUNT 3
+#define BYT_RATIOS 0x66a
+
#define FRAC_BITS 8
#define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
#define fp_toint(X) ((X) >> FRAC_BITS)
@@ -342,6 +344,20 @@ static void intel_pstate_sysfs_expose_params(void)
}
/************************** sysfs end ************************/
+static int byt_get_min_pstate(void)
+{
+ u64 value;
+ rdmsrl(BYT_RATIOS, value);
+ return value & 0xFF;
+}
+
+static int byt_get_max_pstate(void)
+{
+ u64 value;
+ rdmsrl(BYT_RATIOS, value);
+ return (value >> 16) & 0xFF;
+}
+
static int core_get_min_pstate(void)
{
u64 value;
@@ -396,6 +412,24 @@ static struct cpu_defaults core_params = {
},
};
+static struct cpu_defaults byt_params = {
+ .pid_policy = {
+ .sample_rate_ms = 10,
+ .deadband = 0,
+ .setpoint = 97,
+ .p_gain_pct = 14,
+ .d_gain_pct = 0,
+ .i_gain_pct = 4,
+ },
+ .funcs = {
+ .get_max = byt_get_max_pstate,
+ .get_min = byt_get_min_pstate,
+ .get_turbo = byt_get_max_pstate,
+ .set = core_set_pstate,
+ },
+};
+
+
static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
{
int max_perf = cpu->pstate.turbo_pstate;
@@ -553,6 +587,7 @@ static void intel_pstate_timer_func(unsigned long __data)
static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
ICPU(0x2a, core_params),
ICPU(0x2d, core_params),
+ ICPU(0x37, byt_params),
ICPU(0x3a, core_params),
ICPU(0x3c, core_params),
ICPU(0x3e, core_params),