Commit 549750a3 authored by Ryan Taylor's avatar Ryan Taylor Committed by Alex Deucher

drm/include: add PP_FEATURE_MASK comments (v3)

Documents PP_FEATURE_MASK enum.
Provides instructions on how to use ppfeaturemasks.

v2: improve enum definitions and add kernel command line parameters to
    ppfeaturemask instructions
v3: fix alignment issues
Signed-off-by: default avatarRyan Taylor <ryan.taylor@amd.com>
Reviewed-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 265c280a
...@@ -162,6 +162,34 @@ enum amd_powergating_state { ...@@ -162,6 +162,34 @@ enum amd_powergating_state {
#define AMD_PG_SUPPORT_ATHUB (1 << 16) #define AMD_PG_SUPPORT_ATHUB (1 << 16)
#define AMD_PG_SUPPORT_JPEG (1 << 17) #define AMD_PG_SUPPORT_JPEG (1 << 17)
/**
* enum PP_FEATURE_MASK - Used to mask power play features.
*
* @PP_SCLK_DPM_MASK: Dynamic adjustment of the system (graphics) clock.
* @PP_MCLK_DPM_MASK: Dynamic adjustment of the memory clock.
* @PP_PCIE_DPM_MASK: Dynamic adjustment of PCIE clocks and lanes.
* @PP_SCLK_DEEP_SLEEP_MASK: System (graphics) clock deep sleep.
* @PP_POWER_CONTAINMENT_MASK: Power containment.
* @PP_UVD_HANDSHAKE_MASK: Unified video decoder handshake.
* @PP_SMC_VOLTAGE_CONTROL_MASK: Dynamic voltage control.
* @PP_VBI_TIME_SUPPORT_MASK: Vertical blank interval support.
* @PP_ULV_MASK: Ultra low voltage.
* @PP_ENABLE_GFX_CG_THRU_SMU: SMU control of GFX engine clockgating.
* @PP_CLOCK_STRETCH_MASK: Clock stretching.
* @PP_OD_FUZZY_FAN_CONTROL_MASK: Overdrive fuzzy fan control.
* @PP_SOCCLK_DPM_MASK: Dynamic adjustment of the SoC clock.
* @PP_DCEFCLK_DPM_MASK: Dynamic adjustment of the Display Controller Engine Fabric clock.
* @PP_OVERDRIVE_MASK: Over- and under-clocking support.
* @PP_GFXOFF_MASK: Dynamic graphics engine power control.
* @PP_ACG_MASK: Adaptive clock generator.
* @PP_STUTTER_MODE: Stutter mode.
* @PP_AVFS_MASK: Adaptive voltage and frequency scaling.
*
* To override these settings on boot, append amdgpu.ppfeaturemask=<mask> to
* the kernel's command line parameters. This is usually done through a system's
* boot loader (E.g. GRUB). If manually loading the driver, pass
* ppfeaturemask=<mask> as a modprobe parameter.
*/
enum PP_FEATURE_MASK { enum PP_FEATURE_MASK {
PP_SCLK_DPM_MASK = 0x1, PP_SCLK_DPM_MASK = 0x1,
PP_MCLK_DPM_MASK = 0x2, PP_MCLK_DPM_MASK = 0x2,
......
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