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authorAlex Deucher <alexander.deucher@amd.com>2018-04-19 14:38:31 -0500
committerAlex Deucher <alexander.deucher@amd.com>2018-05-15 13:43:45 -0500
commit6b2576f5bddae4c89f29481f387735ac99e256d5 (patch)
treea272e453eb2f6433ff041cfb8d7e12e8609f3038 /drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
parent271dc908732b72bb9b1ad22b7cd14e75df3612c5 (diff)
download96b-common-6b2576f5bddae4c89f29481f387735ac99e256d5.tar.gz
drm/amdgpu/pm: document pp_power_profile_mode
sysfs file for adjusting power level heuristics. Acked-by: Felix Kuehling <Felix.Kuehling@amd.com> Reviewed-by: Huang Rui <ray.huang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c')
-rw-r--r--drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index 07f2e9606337..d6e66414bb12 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -780,6 +780,26 @@ fail:
return count;
}
+/**
+ * DOC: pp_power_profile_mode
+ *
+ * The amdgpu driver provides a sysfs API for adjusting the heuristics
+ * related to switching between power levels in a power state. The file
+ * pp_power_profile_mode is used for this.
+ *
+ * Reading this file outputs a list of all of the predefined power profiles
+ * and the relevant heuristics settings for that profile.
+ *
+ * To select a profile or create a custom profile, first select manual using
+ * power_dpm_force_performance_level. Writing the number of a predefined
+ * profile to pp_power_profile_mode will enable those heuristics. To
+ * create a custom set of heuristics, write a string of numbers to the file
+ * starting with the number of the custom profile along with a setting
+ * for each heuristic parameter. Due to differences across asic families
+ * the heuristic parameters vary from family to family.
+ *
+ */
+
static ssize_t amdgpu_get_pp_power_profile_mode(struct device *dev,
struct device_attribute *attr,
char *buf)