From: Srinivas Pandruvada Date: Sat, 23 Apr 2016 02:53:59 +0000 (-0700) Subject: cpufreq: intel_pstate: Fix processing for turbo activation ratio X-Git-Tag: v4.14-rc1~3333^2^3~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1becf03545a0859ceaaf9e8c2d9861882a71cb01;p=platform%2Fkernel%2Flinux-rpi.git cpufreq: intel_pstate: Fix processing for turbo activation ratio 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: 6a35fc2d6c22 (cpufreq: intel_pstate: get P1 from TAR when available) Signed-off-by: Srinivas Pandruvada Cc: 4.4+ # 4.4+ Signed-off-by: Rafael J. Wysocki --- diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 30fe323..f502d5b 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -813,6 +813,11 @@ 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);