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: Ryan Taylor <ryan.taylor@xxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
drivers/gpu/drm/amd/include/amd_shared.h | 28 ++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/gpu/drm/amd/include/amd_shared.h b/drivers/gpu/drm/amd/include/amd_shared.h
index e98c84ef206f..6f1469742b3a 100644
--- a/drivers/gpu/drm/amd/include/amd_shared.h
+++ b/drivers/gpu/drm/amd/include/amd_shared.h
@@ -128,6 +128,34 @@ 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,
--
2.28.0
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