From: Perry Yuan Date: Tue, 31 Jan 2023 09:00:14 +0000 (+0800) Subject: Documentation: introduce amd pstate active mode kernel command line options X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=5014603e409b01001bfbeae090a16733f61a7640;p=linux.git Documentation: introduce amd pstate active mode kernel command line options AMD Pstate driver support another firmware based autonomous mode with "amd_pstate=active" added to the kernel command line. In autonomous mode SMU firmware decides frequencies at runtime based on workload utilization, usage in other IPs, infrastructure limits such as power, thermals and so on. Acked-by: Huang Rui Reviewed-by: Mario Limonciello Reviewed-by: Wyes Karny 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 6cfa6e3996cf7..e3618dfdb36ab 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -7020,3 +7020,10 @@ management firmware translates the requests into actual hardware states (core frequency, data fabric and memory clocks etc.) + active + Use amd_pstate_epp driver instance as the scaling driver, + driver provides a hint to the hardware if software wants + to bias toward performance (0x0) or energy efficiency (0xff) + to the CPPC firmware. then CPPC power algorithm will + calculate the runtime workload and adjust the realtime cores + frequency.