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authorJosh Boyer <jwboyer@fedoraproject.org>2014-06-20 21:05:53 -0400
committerJosh Boyer <jwboyer@fedoraproject.org>2014-06-20 21:09:27 -0400
commiteb68376381d525f4bb0121c6b90bb725cf31d823 (patch)
tree04685c8dc398373ee42c25a47cedea583c6f9e39 /intel_pstate-Fix-setting-VID.patch
parent7583b10c51624f2d0db3c92d2c62725f399d761f (diff)
downloadkernel-eb68376381d525f4bb0121c6b90bb725cf31d823.tar.gz
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Bring in intel_pstate regression fixes for BayTrail
Diffstat (limited to 'intel_pstate-Fix-setting-VID.patch')
-rw-r--r--intel_pstate-Fix-setting-VID.patch133
1 files changed, 133 insertions, 0 deletions
diff --git a/intel_pstate-Fix-setting-VID.patch b/intel_pstate-Fix-setting-VID.patch
new file mode 100644
index 000000000..a71432c59
--- /dev/null
+++ b/intel_pstate-Fix-setting-VID.patch
@@ -0,0 +1,133 @@
+
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+ Fri, 20 Jun 2014 07:28:10 -0700 (PDT)
+From: dirk.brandewie@gmail.com
+X-Google-Original-From: dirk.j.brandewie@intel.com
+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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