diff mbox series

[07/12] cpufreq: amd_pstate: map desired perf into pstate scope for powersave governor

Message ID 20220707170022.216202-1-Perry.Yuan@amd.com
State New
Headers show
Series [01/12] x86/msr: Add the MSR definition for AMD CPPC hardware control. | expand

Commit Message

Yuan, Perry July 7, 2022, 5 p.m. UTC 
The patch will fix the invalid desired perf value for powersave
governor. This issue is found when testing on one AMD EPYC system, the
actual des_perf is smaller than the min_perf value, that is invalid
value. because the min_perf is the lowest_perf system can support in
idle state.

Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
---
 drivers/cpufreq/amd-pstate.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 7c51f4125263..154eed849f38 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -317,6 +317,7 @@  static int amd_pstate_target(struct cpufreq_policy *policy,
 	des_perf = DIV_ROUND_CLOSEST(target_freq * cap_perf,
 				     cpudata->max_freq);
 
+	des_perf = clamp_t(unsigned long, des_perf, min_perf, max_perf);
 	cpufreq_freq_transition_begin(policy, &freqs);
 	amd_pstate_update(cpudata, min_perf, des_perf,
 			  max_perf, false);