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authorWyes Karny <wyes.karny@amd.com>2023-05-18 07:58:19 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2023-05-25 19:35:13 +0200
commit3bf8c6307bad5c0cc09cde982e146d847859b651 (patch)
tree629384c4a0a4c24cab17c011f8ff22e090126d70 /drivers/cpufreq
parentcpufreq: amd-pstate: Remove fast_switch_possible flag from active driver (diff)
downloadlinux-3bf8c6307bad5c0cc09cde982e146d847859b651.tar.xz
linux-3bf8c6307bad5c0cc09cde982e146d847859b651.zip
cpufreq: amd-pstate: Update policy->cur in amd_pstate_adjust_perf()
Driver should update policy->cur after updating the frequency. Currently amd_pstate doesn't update policy->cur when `adjust_perf` is used. Which causes /proc/cpuinfo to show wrong cpu frequency. Fix this by updating policy->cur with correct frequency value in adjust_perf function callback. - Before the fix: (setting min freq to 1.5 MHz) [root@amd]# cat /proc/cpuinfo | grep "cpu MHz" | sort | uniq --count 1 cpu MHz : 1777.016 1 cpu MHz : 1797.160 1 cpu MHz : 1797.270 189 cpu MHz : 400.000 - After the fix: (setting min freq to 1.5 MHz) [root@amd]# cat /proc/cpuinfo | grep "cpu MHz" | sort | uniq --count 1 cpu MHz : 1753.353 1 cpu MHz : 1756.838 1 cpu MHz : 1776.466 1 cpu MHz : 1776.873 1 cpu MHz : 1777.308 1 cpu MHz : 1779.900 183 cpu MHz : 1805.231 1 cpu MHz : 1956.815 1 cpu MHz : 2246.203 1 cpu MHz : 2259.984 Fixes: 1d215f0319c2 ("cpufreq: amd-pstate: Add fast switch function for AMD P-State") Signed-off-by: Wyes Karny <wyes.karny@amd.com> [ rjw: Subject edits ] Cc: 5.17+ <stable@vger.kernel.org> # 5.17+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/amd-pstate.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index ac54779f5a49..ddd346a239e0 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -501,12 +501,14 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
unsigned long capacity)
{
unsigned long max_perf, min_perf, des_perf,
- cap_perf, lowest_nonlinear_perf;
+ cap_perf, lowest_nonlinear_perf, max_freq;
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
struct amd_cpudata *cpudata = policy->driver_data;
+ unsigned int target_freq;
cap_perf = READ_ONCE(cpudata->highest_perf);
lowest_nonlinear_perf = READ_ONCE(cpudata->lowest_nonlinear_perf);
+ max_freq = READ_ONCE(cpudata->max_freq);
des_perf = cap_perf;
if (target_perf < capacity)
@@ -523,6 +525,10 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
if (max_perf < min_perf)
max_perf = min_perf;
+ des_perf = clamp_t(unsigned long, des_perf, min_perf, max_perf);
+ target_freq = div_u64(des_perf * max_freq, max_perf);
+ policy->cur = target_freq;
+
amd_pstate_update(cpudata, min_perf, des_perf, max_perf, true,
policy->governor->flags);
cpufreq_cpu_put(policy);