[PATCH 4/6] drm/amdgpu/pm: document pp_dpm_sclk pp_dpm_mclk pp_dpm_pcie

[Zhu, Rex]

Hi Alex,

>  There  will be a '*' next to the level that is currently active.

We need to add a level for deep sleep state.
Otherwise, On Vega/Rv, when gpu in deepsleep, we can't set "*" for the current level.


Best Regards
Rex

-----Original Message-----
From: amd-gfx [mailto:amd-gfx-bounces at lists.freedesktop.org] On Behalf Of Alex Deucher
Sent: Friday, April 20, 2018 4:05 AM
To: amd-gfx at lists.freedesktop.org
Cc: Deucher, Alexander
Subject: [PATCH 4/6] drm/amdgpu/pm: document pp_dpm_sclk pp_dpm_mclk pp_dpm_pcie

Used for manually masking dpm states.

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index 9982f1b1f8c4..3f1715b1a547 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -539,6 +539,24 @@ static ssize_t amdgpu_get_pp_od_clk_voltage(struct device *dev,
 
 }
 
+/**
+ * DOC: pp_dpm_sclk pp_dpm_mclk pp_dpm_pcie
+ *
+ * The amdgpu driver provides a sysfs API for adjusting what power levels
+ * are enabled for a given power state.  The files pp_dpm_sclk, pp_dpm_mclk,
+ * and pp_dpm_pcie are used for this.
+ *
+ * Reading back the files will show you the available power levels within
+ * the power state and the clock information for those levels.  There
+ * will be a '*' next to the level that is currently active.
+ *
+ * To manually adjust these states, first select manual using
+ * power_dpm_force_performance_level.  Writing a string of the level
+ * numbers to the file will select which levels you want to enable.
+ * E.g., writing 456 to the file will enable levels 4, 5, and 6.
+ *
+ */
+
 static ssize_t amdgpu_get_pp_dpm_sclk(struct device *dev,
 		struct device_attribute *attr,
 		char *buf)
-- 
2.13.6

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