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From: Perry Yuan <perry.yuan@amd.com>
To: <rafael.j.wysocki@intel.com>, <Mario.Limonciello@amd.com>,
	<viresh.kumar@linaro.org>, <gautham.shenoy@amd.com>,
	<Borislav.Petkov@amd.com>, <Ray.Huang@amd.com>,
	<Alexander.Deucher@amd.com>
Cc: <Xinmei.Huang@amd.com>, <oleksandr@natalenko.name>,
	<Xiaojian.Du@amd.com>, <Li.Meng@amd.com>,
	<linux-pm@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH v7 4/6] cpufreq: amd-pstate: fix the MSR highest perf will be reset issue while cpb boost off
Date: Tue, 23 Apr 2024 16:40:57 +0800	[thread overview]
Message-ID: <3548a1e1056d9d08286da8ca1c68da23c6672ee3.1713861200.git.perry.yuan@amd.com> (raw)
In-Reply-To: <cover.1713861200.git.perry.yuan@amd.com>

From: Perry Yuan <Perry.Yuan@amd.com>

Select the min perf to fix the highest perf value while update pstate
CPPC request MSR register, here we need to limit the max perf value when
CPU boost is disabled in case of that highest perf value in the MSR will be
reset to original highest perf value which cause the BOOST control
failed.

Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
---
 drivers/cpufreq/amd-pstate.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 49eeb38fcf20..22e5b84dbe28 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -476,6 +476,7 @@ static void amd_pstate_update(struct amd_cpudata *cpudata, u32 min_perf,
 			      u32 des_perf, u32 max_perf, bool fast_switch, int gov_flags)
 {
 	u64 prev = READ_ONCE(cpudata->cppc_req_cached);
+	u32 nominal_perf = READ_ONCE(cpudata->nominal_perf);
 	u64 value = prev;
 
 	min_perf = clamp_t(unsigned long, min_perf, cpudata->min_limit_perf,
@@ -495,6 +496,10 @@ static void amd_pstate_update(struct amd_cpudata *cpudata, u32 min_perf,
 	value &= ~AMD_CPPC_DES_PERF(~0L);
 	value |= AMD_CPPC_DES_PERF(des_perf);
 
+	/* limit the max perf when core performance boost feature is disabled */
+	if (!amd_pstate_global_params.cpb_boost)
+		max_perf = min_t(unsigned long, nominal_perf, max_perf);
+
 	value &= ~AMD_CPPC_MAX_PERF(~0L);
 	value |= AMD_CPPC_MAX_PERF(max_perf);
 
-- 
2.34.1


  parent reply	other threads:[~2024-04-23  8:41 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-23  8:40 [PATCH v7 0/6] AMD Pstate Driver Core Performance Boost Perry Yuan
2024-04-23  8:40 ` [PATCH v7 1/6] cpufreq: acpi: move MSR_K7_HWCR_CPB_DIS_BIT into msr-index.h Perry Yuan
2024-04-23 10:40   ` Huang Rui
2024-04-23  8:40 ` [PATCH v7 2/6] cpufreq: amd-pstate: initialize new core precision boost state Perry Yuan
2024-04-23 10:51   ` Huang Rui
2024-04-23  8:40 ` [PATCH v7 3/6] cpufreq: amd-pstate: implement cpb_boost sysfs entry for boost control Perry Yuan
2024-04-23 11:00   ` Huang Rui
2024-04-26  6:40     ` Yuan, Perry
2024-04-25 21:17   ` Mario Limonciello
2024-04-26  6:39     ` Yuan, Perry
2024-04-23  8:40 ` Perry Yuan [this message]
2024-04-23 11:04   ` [PATCH v7 4/6] cpufreq: amd-pstate: fix the MSR highest perf will be reset issue while cpb boost off Huang Rui
2024-04-23  8:40 ` [PATCH v7 5/6] Documentation: cpufreq: amd-pstate: introduce the new cpu boost control method Perry Yuan
2024-04-23  8:40 ` [PATCH v7 6/6] cpufreq: amd-pstate-ut: support new cpb boost control interface Perry Yuan
2024-04-23 11:07   ` Huang Rui

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