From 6b2576f5bddae4c89f29481f387735ac99e256d5 Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Thu, 19 Apr 2018 14:38:31 -0500 Subject: [PATCH] drm/amdgpu/pm: document pp_power_profile_mode sysfs file for adjusting power level heuristics. Acked-by: Felix Kuehling Reviewed-by: Huang Rui Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c index 07f2e96..d6e66414 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) -- 2.7.4