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From 70c8b518c22a49a9dd6caf85720dfb66c7dd7bb4 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Thu, 19 Apr 2018 14:22:24 -0500
Subject: [PATCH 4244/5725] drm/amdgpu/pm: document pp_dpm_sclk pp_dpm_mclk
pp_dpm_pcie (v2)
Used for manually masking dpm states.
v2: drop comment about current state (Rex)
Acked-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index b659f4b3..4480212 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -540,6 +540,23 @@ 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.
+ *
+ * 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)
--
2.7.4
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