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[v2,05/10] Documentation: PM: amd-pstate: add debugging section for driver loading failure

Message ID d18eb3b0574de5c93fde348bf14b6548282989c3.1715356532.git.perry.yuan@amd.com (mailing list archive)
State Superseded, archived
Delegated to: Mario Limonciello
Headers show
Series AMD Pstate Driver Fixes and Improvements | expand

Commit Message

Yuan, Perry May 13, 2024, 2:07 a.m. UTC 
To address issues with the loading of the amd-pstate driver on certain platforms,
It needs to enable dynamic debugging to capture debug messages during the driver
loading process. By adding "amd_pstate.dyndbg=+p cppc_acpi.dyndbg=+p  loglevel=4 debug
amd_pstate=active" to the kernel command line, driver debug logging is enabled.

Signed-off-by: Perry Yuan <perry.yuan@amd.com>
---
 Documentation/admin-guide/pm/amd-pstate.rst | 13 +++++++++++++
 1 file changed, 13 insertions(+)
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Patch

diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
index 1e0d101b020a..de83e742738e 100644
--- a/Documentation/admin-guide/pm/amd-pstate.rst
+++ b/Documentation/admin-guide/pm/amd-pstate.rst
@@ -472,6 +472,19 @@  operations for the new ``amd-pstate`` module with this tool. ::
 Diagnostics and Tuning
 =======================
 
+Debugging AMD P-State Driver Loading Issues
+------------------------------------------
+
+On some platforms, there may be issues with the loading of the amd-pstate driver.
+To capture debug messages for issue analysis, users can add below parameter,
+"amd_pstate.dyndbg=+p cppc_acpi.dyndbg=+p debug"
+to the kernel command line. This will enable dynamic debugging and allow better
+analysis and troubleshooting of the driver loading process.
+
+Please note that adding this parameter will only enable debug logging during the
+driver loading phase and may affect system behavior. Use this option with caution
+and only for debugging purposes.
+
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