[Bug 219851] New: [amd-pstate 6.15] Frequency Scaling Will Not Scale Above Lowest Non-Linear Performance on Ryzen 7 5700U

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=219851

            Bug ID: 219851
           Summary: [amd-pstate 6.15] Frequency Scaling Will Not Scale
                    Above Lowest Non-Linear Performance on Ryzen 7 5700U
           Product: Power Management
           Version: 2.5
          Hardware: AMD
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: cpufreq
          Assignee: linux-pm@vger.kernel.org
          Reporter: dnaim@cachyos.org
        Regression: No

Created attachment 307781
  --> https://bugzilla.kernel.org/attachment.cgi?id=307781&action=edit
amd-pstate-triage log from bad kernel

On a kernel build with 6.15 amd-pstate material taken from
https://web.git.kernel.org/pub/scm/linux/kernel/git/superm1/linux.git/tag/?h=amd-pstate-v6.15-2025-03-03,
a user noticed that frequency scaling will not scale above Lowest Non-Linear
Perf. Git bisect shows the below as the first bad commit.

620136ced35a9329f4d1ea90e51bee2dfd7ee5b0 is the first bad commit
commit 620136ced35a9329f4d1ea90e51bee2dfd7ee5b0
Author: Dhananjay Ugwekar <dhananjay.ugwekar@amd.com>
Date:   Wed Feb 5 11:25:18 2025 +0000

    cpufreq/amd-pstate: Modularize perf<->freq conversion

    Delegate the perf<->frequency conversion to helper functions to reduce
    code duplication, and improve readability.

    Signed-off-by: Dhananjay Ugwekar <dhananjay.ugwekar@amd.com>
    Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
    Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
    Link:
https://lore.kernel.org/r/20250205112523.201101-8-dhananjay.ugwekar@amd.com
    Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>

 drivers/cpufreq/amd-pstate.c | 57
++++++++++++++++++++++++++++++---------------------------
 1 file changed, 30 insertions(+), 27 deletions(-)

Attached are amd-pstate-triage logs from good and bad kernels. They are not
necessarily equal because a revert of the bad commit isn't trivial with the
whole 6.15 content so the "good" kernel only has patches from Dhananjay's
series and the bad commit reverted.

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