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Android8.0 高通PDAF 调试 – actuator sensitivity

有一说一

遇到的问题点
调试过程中发现进不来pdaf流程 log显示如下：

01-01 08:08:54.425  2414  6352 D mm-camera: <STATS_AF ><  LOW> 3994: af_port_handle_module_event: Handle AF module event of type: 0
01-01 08:08:54.425  2414  6352 D mm-camera: <STATS_AF ><  LOW> 3158: af_port_handle_sensor_update: Sensor Res width: 4208 height: 3120 FocalLength: 3.460000 and FNum: 2.200000
01-01 08:08:54.425  2414  6352 E mm-camera: <STATS_AF ><ERROR> 3167: af_port_handle_sensor_update: Depth_Err: actuator sensitivity: 0.000000 is invalid
01-01 08:08:54.425  2414  6352 D mm-camera: <STATS_AF ><  LOW> 3173: af_port_handle_sensor_update: Depth_Err: pdaf cal data from sensor supported 1 pdaf_ptr 0xef1e4010

01-01 08:08:54.701  2414  6370 D mm-camera: <STATS_AF ><  LOW> 4216: af_port_handle_module_event: Received PDAF stats: frame_id: 3, buf_idx: 0
01-01 08:08:54.701  2414  6370 D mm-camera: <STATS_AF >< HIGH> 3831: af_port_handle_pdaf_stats: Depth_Err Pdaf not supported. Shouldn't get PDAF stats

问题分析：

Review 代码发现逻辑如下：

    /* update depth service cal data */
    af_port->ds_input.cal_data.eff_focal_length = sensor_info->actuator_info.focal_length;
    af_port->ds_input.cal_data.f_num = sensor_info->actuator_info.af_f_num;
    af_port->ds_input.cal_data.pixel_size  = sensor_info->actuator_info.af_f_pix;
    af_port->ds_input.cal_data.is_pdaf_supported = sensor_update->is_pdaf_supported;
    af_port->ds_input.cal_data.actuator_sensitivity = sensor_update->actuator_sensitivity;
    if(sensor_update->actuator_sensitivity <= 0) { 
   
      AF_ERR("Depth_Err: actuator sensitivity: %f is invalid",
        sensor_update->actuator_sensitivity);
      rc = FALSE;
    }

    if(sensor_update->is_pdaf_supported && FALSE == rc) { 
   
      AF_LOW("Depth_Err: pdaf cal data from sensor supported %d pdaf_ptr %p",
        sensor_update->is_pdaf_supported, sensor_update->pdaf_data);
       af_port->ds_input.cal_data.is_pdaf_supported = 0;
    }

actuator_sensitivity invalid时， 无法启用pdaf support
那么这个问题是哪里来的呢？
sensor初始化的时候 我们可以发现 计算actuator_sensitivity的过程

boolean module_sensor_actuator_init_calibrate(
    module_sensor_bundle_info_t *s_bundle)
{ 
   
        /* calcualte actuator sensitivity assuming total_steps is tuned to number of um */
        s_bundle->actuator_sensitivity =
          (float)af_driver_ptr->actuator_tuned_params.region_params[0].qvalue /
          af_driver_ptr->actuator_tuned_params.region_params[0].code_per_step;
    }
    /* protect the qvalue */
    else { 
   
      af_driver_ptr->actuator_tuned_params.region_params[0].qvalue = 1;
    }
}

这个时候 需要马达的qvuale值，经过对比
发现马达驱动没有此设置
遂改之

    .actuator_tuned_params =
    { 
   
      .scenario_size =
      { 
   
        2, /* MOVE_NEAR */
        3, /* MOVE_FAR */
      },
      .ringing_scenario =
      { 
   
        /* MOVE_NEAR */
        { 
   
          36,
          243,
        },
        /* MOVE_FAR */
        { 
   
          72,
          198,
          243,
        },
      },
      .initial_code = 136,
      .region_size = 1,
      .region_params =
      { 
   
        { 
   
          .step_bound =
          { 
   
            243, /* Macro step boundary*/
            0, /* Infinity step boundary*/
          },
          .code_per_step = 1,
          .qvalue = 1,
        },
      },