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intel_pstate: Set turbo VID for BayTrail

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A documentation update exposed that there is a separate set of VID
values that must be used in the turbo/boost P state range.  Add
enumerating and setting the correct VID for P states in the turbo
range.

Cc: v3.13+ <stable@vger.kernel.org> # v3.13+
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dirk Brandewie 2014-05-08 12:57:23 -07:00 committed by Rafael J. Wysocki
parent d6d211db37
commit 21855ff5bc
1 changed files with 15 additions and 6 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

21
drivers/cpufreq/intel_pstate.c
View file

@ -37,6 +37,7 @@
#define BYT_RATIOS 0x66a
#define BYT_VIDS 0x66b
#define BYT_TURBO_RATIOS 0x66c
#define BYT_TURBO_VIDS 0x66d
#define FRAC_BITS 6
@ -70,8 +71,9 @@ struct pstate_data {
};
struct vid_data {
int32_t min;
int32_t max;
int min;
int max;
int turbo;
int32_t ratio;
};
@ -359,14 +361,14 @@ static int byt_get_min_pstate(void)
{
u64 value;
rdmsrl(BYT_RATIOS, value);
return (value >> 8) & 0xFF;
return (value >> 8) & 0x3F;
}
static int byt_get_max_pstate(void)
{
u64 value;
rdmsrl(BYT_RATIOS, value);
return (value >> 16) & 0xFF;
return (value >> 16) & 0x3F;
}
static int byt_get_turbo_pstate(void)
@ -393,6 +395,9 @@ static void byt_set_pstate(struct cpudata *cpudata, int pstate)
vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max);
vid = fp_toint(vid_fp);
if (pstate > cpudata->pstate.max_pstate)
vid = cpudata->vid.turbo;
val |= vid;
wrmsrl(MSR_IA32_PERF_CTL, val);
@ -402,13 +407,17 @@ static void byt_get_vid(struct cpudata *cpudata)
{
u64 value;
rdmsrl(BYT_VIDS, value);
cpudata->vid.min = int_tofp((value >> 8) & 0x7f);
cpudata->vid.max = int_tofp((value >> 16) & 0x7f);
cpudata->vid.min = int_tofp((value >> 8) & 0x3f);
cpudata->vid.max = int_tofp((value >> 16) & 0x3f);
cpudata->vid.ratio = div_fp(
cpudata->vid.max - cpudata->vid.min,
int_tofp(cpudata->pstate.max_pstate -
cpudata->pstate.min_pstate));
rdmsrl(BYT_TURBO_VIDS, value);
cpudata->vid.turbo = value & 0x7f;
}