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cpufreq/amd-pstate: Fix amd_pstate mode switch on shared memory systems

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BugLink: https://bugs.launchpad.net/bugs/2097575

[ Upstream commit c10e50a469b5ec91eabf653526a22bdce03a9bca ]

While switching the driver mode between active and passive, Collaborative
Processor Performance Control (CPPC) is disabled in
amd_pstate_unregister_driver(). But, it is not enabled back while registering
the new driver (passive or active). This leads to the new driver mode not
working correctly, so enable it back in amd_pstate_register_driver().

Fixes: 3ca7bc818d ("cpufreq: amd-pstate: Add guided mode control support via sysfs")
Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20241004122303.94283-1-Dhananjay.Ugwekar@amd.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Dhananjay Ugwekar
2024-10-04 12:23:04 +00:00
committed by Stefan Bader
parent 90c4b80c2f
commit 33d9562980
1 changed files with 10 additions and 0 deletions
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drivers/cpufreq/amd-pstate.c
+10
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@@ -1134,11 +1134,21 @@ static int amd_pstate_register_driver(int mode)
return -EINVAL;
cppc_state = mode;
ret = amd_pstate_enable(true);
if (ret) {
pr_err("failed to enable cppc during amd-pstate driver registration, return %d\n",
ret);
amd_pstate_driver_cleanup();
return ret;
}
ret = cpufreq_register_driver(current_pstate_driver);
if (ret) {
amd_pstate_driver_cleanup();
return ret;
}
return 0;
}