amdgpu/pm: Implement new API function "emit" that accepts buffer base and write offset

   (v3)
     Rewrote patchset to order patches as (API, hw impl, usecase)

     - added API for new power management function emit_clk_levels
       This function should duplicate the functionality of print_clk_levels,
       but this solution passes the buffer base and write offset down the stack.
     - new powerplay function emit_clock_levels, implemented by smu_emit_ppclk_levels()
       This function parallels the implementation of smu_print_ppclk_levels and
       calls emit_clk_levels, and allows the returns of errors
     - new helper function smu_convert_to_smuclk called by smu_print_ppclk_levels and
       smu_emit_ppclk_levels

Signed-off-by: Darren Powell <darren.powell@amd.com>
Reviewed-By: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
index ef574c96b41c..1d63f1e8884c 100644
--- a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
@@ -890,6 +890,27 @@ int amdgpu_dpm_print_clock_levels(struct amdgpu_device *adev,
 	return ret;
 }
 
+int amdgpu_dpm_emit_clock_levels(struct amdgpu_device *adev,
+				  enum pp_clock_type type,
+				  char *buf,
+				  int *offset)
+{
+	const struct amd_pm_funcs *pp_funcs = adev->powerplay.pp_funcs;
+	int ret = 0;
+
+	if (!pp_funcs->emit_clock_levels)
+		return -ENOENT;
+
+	mutex_lock(&adev->pm.mutex);
+	ret = pp_funcs->emit_clock_levels(adev->powerplay.pp_handle,
+					   type,
+					   buf,
+					   offset);
+	mutex_unlock(&adev->pm.mutex);
+
+	return ret;
+}
+
 int amdgpu_dpm_set_ppfeature_status(struct amdgpu_device *adev,
 				    uint64_t ppfeature_masks)
 {