From: Perry Yuan Date: Thu, 17 Nov 2022 07:35:41 +0000 (+0800) Subject: Documentation: add amd-pstate kernel command line options X-Git-Tag: v6.1~74^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1056d314709d0607a22e589c54b1e47e0da57b9d;p=platform%2Fkernel%2Flinux-starfive.git Documentation: add amd-pstate kernel command line options Add a new amd pstate driver command line option to enable driver passive working mode via MSR and shared memory interface to request desired performance within abstract scale and the power management firmware (SMU) convert the perf requests into actual hardware pstates. Also the `disable` parameter can disable the pstate driver loading by adding `amd_pstate=disable` to kernel command line. Acked-by: Huang Rui Reviewed-by: Gautham R. Shenoy Tested-by: Wyes Karny Signed-off-by: Perry Yuan Signed-off-by: Rafael J. Wysocki --- diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index a465d52..42af9ca 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -6959,3 +6959,14 @@ memory, and other data can't be written using xmon commands. off xmon is disabled. + + amd_pstate= [X86] + disable + Do not enable amd_pstate as the default + scaling driver for the supported processors + passive + Use amd_pstate as a scaling driver, driver requests a + desired performance on this abstract scale and the power + management firmware translates the requests into actual + hardware states (core frequency, data fabric and memory + clocks etc.)