Patch "cpufreq: intel_pstate: Fix processing for turbo activation ratio" has been added to the 4.5-stable tree

This is a note to let you know that I've just added the patch titled

cpufreq: intel_pstate: Fix processing for turbo activation ratio

to the 4.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
cpufreq-intel_pstate-fix-processing-for-turbo-activation-ratio.patch
and it can be found in the queue-4.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Srinivas Pandruvada <[email protected]>
Date: Fri, 22 Apr 2016 19:53:59 -0700
Subject: cpufreq: intel_pstate: Fix processing for turbo activation ratio

From: Srinivas Pandruvada <[email protected]>

commit 1becf03545a0859ceaaf9e8c2d9861882a71cb01 upstream.

When the config TDP level is not nominal (level = 0), the MSR values for reading level 1 and level 2 ratios contain power in low 14 bits and actual ratio bits are at bits [23:16]. The current processing for level 1 and level 2 is wrong as there is no shift done to get actual ratio.

---
 drivers/cpufreq/intel_pstate.c |    5 +++++
 1 file changed, 5 insertions(+)

@@ -673,6 +673,11 @@ static int core_get_max_pstate(void)
 			if (err)
 				goto skip_tar;
 
+			/* For level 1 and 2, bits[23:16] contain the ratio */
+			if (tdp_ctrl)
+				tdp_ratio >>= 16;
+
+			tdp_ratio &= 0xff; /* ratios are only 8 bits long */
 			if (tdp_ratio - 1 == tar) {
 				max_pstate = tar;
 				pr_debug("max_pstate=TAC %x\n", max_pstate);

Patches currently in stable-queue which might be from [email protected] are

queue-4.5/cpufreq-intel_pstate-fix-processing-for-turbo-activation-ratio.patch