drm/amdgpu: Add amdgpu_gfx_off_ctrl function

v2:
   1. drop the special handling for the hw IP
      suggested by hawking and Christian.
   2. refine the variable name suggested by Flora.

This funciton as the entry of gfx off feature.
we arbitrat gfx off feature enable/disable in this
function.

Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
index 239bf2a4b3c6..1cdb26471a03 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
@@ -340,3 +340,39 @@ void amdgpu_gfx_compute_mqd_sw_fini(struct amdgpu_device *adev)
 			      &ring->mqd_gpu_addr,
 			      &ring->mqd_ptr);
 }
+
+/* amdgpu_gfx_off_ctrl - Handle gfx off feature enable/disable
+ *
+ * @adev: amdgpu_device pointer
+ * @bool enable true: enable gfx off feature, false: disable gfx off feature
+ *
+ * 1. gfx off feature will be enabled by gfx ip after gfx cg gp enabled.
+ * 2. other client can send request to disable gfx off feature, the request should be honored.
+ * 3. other client can cancel their request of disable gfx off feature
+ * 4. other client should not send request to enable gfx off feature before disable gfx off feature.
+ */
+
+void amdgpu_gfx_off_ctrl(struct amdgpu_device *adev, bool enable)
+{
+	if (!(adev->powerplay.pp_feature & PP_GFXOFF_MASK))
+		return;
+
+	if (!adev->powerplay.pp_funcs->set_powergating_by_smu)
+		return;
+
+	mutex_lock(&adev->gfx.gfx_off_mutex);
+
+	if (!enable)
+		adev->gfx.gfx_off_req_count++;
+	else if (adev->gfx.gfx_off_req_count > 0)
+		adev->gfx.gfx_off_req_count--;
+
+	if (enable && !adev->gfx.gfx_off_state && !adev->gfx.gfx_off_req_count) {
+		if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, true))
+			adev->gfx.gfx_off_state = true;
+	} else if (!enable && adev->gfx.gfx_off_state) {
+		if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, false))
+			adev->gfx.gfx_off_state = false;
+	}
+	mutex_unlock(&adev->gfx.gfx_off_mutex);
+}