diff mbox series

[v5,4/8] cpufreq: amd-pstate: fix max_perf calculation for amd_get_max_freq()

Message ID cb7e254f8def659a35481dc48d90d2b4391e21f5.1710473712.git.perry.yuan@amd.com
State New
Headers show
Series AMD Pstate Driver Core Performance Boost | expand

Commit Message

Yuan, Perry March 15, 2024, 3:38 a.m. UTC 
From: Perry Yuan <Perry.Yuan@amd.com>

When CPU core Precision Boost state changed, the max frequency will also
need to be updated according to the current boost state, if boost is
disabled now, the max perf will be limited to nominal perf values.
otherwise the max frequency will be showed wrongly.

Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
---
 drivers/cpufreq/amd-pstate.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 025f35bd3b01..a4bcac673fdb 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -676,6 +676,10 @@  static int amd_get_max_freq(struct amd_cpudata *cpudata)
 	nominal_perf = READ_ONCE(cpudata->nominal_perf);
 	max_perf = READ_ONCE(cpudata->highest_perf);
 
+	/* when boost is off, the highest perf will be limited to nominal_perf */
+	if (!amd_pstate_global_params.cpb_boost)
+		max_perf = nominal_perf;
+
 	boost_ratio = div_u64(max_perf << SCHED_CAPACITY_SHIFT,
 			      nominal_perf);