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drm/amdgpu/pm: document pp_dpm_sclk pp_dpm_mclk pp_dpm_pcie (v2)

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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>
This commit is contained in:
Alex Deucher 2018-04-19 14:22:24 -05:00
parent d54bb40f60
commit 271dc90873
1 changed files with 17 additions and 0 deletions
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17
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
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@ -539,6 +539,23 @@ 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)