raspi/linux
1
0
Fork 1
mirror of https://github.com/raspberrypi/linux.git synced 2025-12-06 10:00:17 +00:00
Code Issues Projects Releases Wiki Activity

cpufreq: intel_pstate: Fix processing for turbo activation ratio

Browse Source 
commit 1becf03545 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.

Fixes: 6a35fc2d6c (cpufreq: intel_pstate: get P1 from TAR when available)
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Srinivas Pandruvada
2016-04-22 19:53:59 -07:00
committed by popcornmix
parent c4ee8c3730
commit cc77c99409
1 changed files with 5 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/cpufreq/intel_pstate.c
View File

@@ -667,6 +667,11 @@ static int core_get_max_pstate(void)
if (err) if (err)
goto skip_tar; 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) { if (tdp_ratio - 1 == tar) {
max_pstate = tar; max_pstate = tar;
pr_debug("max_pstate=TAC %x\n", max_pstate); pr_debug("max_pstate=TAC %x\n", max_pstate);