Bring in intel_pstate regression fixes for BayTrail

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 00000000..a71432c5
--- /dev/null
+++ b/intel_pstate-Fix-setting-VID.patch
@@ -0,0 +1,133 @@
+                                                                                                                                                                                                                                                               
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+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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