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From: dirk.brandewie@gmail.com
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To: linux-pm@vger.kernel.org
Cc: rjw@rjwysocki.net, dirk.brandewie@gmail.com,
stable@vger.kernel.org, Dirk Brandewie <dirk.j.brandewie@intel.com>
Subject: [PATCH 1/3] intel_pstate: Fix setting VID
Date: Fri, 20 Jun 2014 07:27:58 -0700
Message-Id: <1403274480-10593-2-git-send-email-dirk.j.brandewie@intel.com>
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From: Dirk Brandewie <dirk.j.brandewie@intel.com>
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.
Reported-by: Rune Reterson <rune@megahurts.dk>
Reported-by: Eric Eickmeyer <erich@ericheickmeyer.com>
Tested-by: Rune Reterson <rune@megahurts.dk>
Tested-by: Eric Eickmeyer <erich@ericheickmeyer.com>
References: https://bugzilla.kernel.org/show_bug.cgi?id=77951
Cc: Cc: Stable <stable@vger.kernel.org> [3.13+]
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
---
drivers/cpufreq/intel_pstate.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 924bb2d..74376d6 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -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 -
--
1.9.0
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