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

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

drivers/gpu/drm/amd/include/amd_shared.h

+28 −0
Original line number Diff line number Diff line
@@ -162,6 +162,34 @@ enum amd_powergating_state { 
#define AMD_PG_SUPPORT_ATHUB			(1 << 16)

#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 {

	PP_SCLK_DPM_MASK = 0x1,

	PP_MCLK_DPM_MASK = 0x2,