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intel_pstate: Fix setting VID

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Commit 21855ff5 (intel_pstate: Set turbo VID for BayTrail) introduced
setting the turbo VID which is required to prevent a machine check on
some Baytrail SKUs under heavy graphics based workloads.  The
docmumentation update that brought the requirement to light also
changed the bit mask used for enumerating P state and VID values from
0x7f to 0x3f.

This change returns the mask value to 0x7f.

Tested with the Intel NUC DN2820FYK,
BIOS version FYBYT10H.86A.0034.2014.0513.1413 with v3.16-rc1 and
v3.14.8 kernel versions.

Fixes: 21855ff5 (intel_pstate: Set turbo VID for BayTrail)
Link: https://bugzilla.kernel.org/show_bug.cgi?id=77951
Reported-and-tested-by: Rune Reterson <[email protected]>
Reported-and-tested-by: Eric Eickmeyer <[email protected]>
Cc: 3.13+ <[email protected]>  # 3.13+
Signed-off-by: Dirk Brandewie <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Dirk Brandewie 2014-06-20 07:27:58 -07:00 • committed by Rafael J. Wysocki
commit c16ed06024
1 changed files with 5 additions and 5 deletions
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10
drivers/cpufreq/intel_pstate.c
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@ -357,21 +357,21 @@ static int byt_get_min_pstate(void)
{
u64 value;
rdmsrl(BYT_RATIOS, value);
return (value >> 8) & 0x3F;
return (value >> 8) & 0x7F;
}
static int byt_get_max_pstate(void)
{
u64 value;
rdmsrl(BYT_RATIOS, value);
return (value >> 16) & 0x3F;
return (value >> 16) & 0x7F;
}
static int byt_get_turbo_pstate(void)
{
u64 value;
rdmsrl(BYT_TURBO_RATIOS, value);
return value & 0x3F;
return value & 0x7F;
}
static void byt_set_pstate(struct cpudata *cpudata, int pstate)
@ -405,8 +405,8 @@ static void byt_get_vid(struct cpudata *cpudata)
rdmsrl(BYT_VIDS, value);
cpudata->vid.min = int_tofp((value >> 8) & 0x3f);
cpudata->vid.max = int_tofp((value >> 16) & 0x3f);
cpudata->vid.min = int_tofp((value >> 8) & 0x7f);
cpudata->vid.max = int_tofp((value >> 16) & 0x7f);
cpudata->vid.ratio = div_fp(
cpudata->vid.max - cpudata->vid.min,
int_tofp(cpudata->pstate.max_pstate -