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Diffstat (limited to 'Documentation/gpu/panfrost.rst')
| -rw-r--r-- | Documentation/gpu/panfrost.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/gpu/panfrost.rst b/Documentation/gpu/panfrost.rst index b80e41f4b2..51ba375fd8 100644 --- a/Documentation/gpu/panfrost.rst +++ b/Documentation/gpu/panfrost.rst @@ -38,3 +38,12 @@ the currently possible format options: Possible `drm-engine-` key names are: `fragment`, and `vertex-tiler`. `drm-curfreq-` values convey the current operating frequency for that engine. + +Users must bear in mind that engine and cycle sampling are disabled by default, +because of power saving concerns. `fdinfo` users and benchmark applications which +query the fdinfo file must make sure to toggle the job profiling status of the +driver by writing into the appropriate sysfs node:: + + echo <N> > /sys/bus/platform/drivers/panfrost/[a-f0-9]*.gpu/profiling + +Where `N` is either `0` or `1`, depending on the desired enablement status. |