8765平台如何区分前后摄电压不一致（以DVDD为例）可以参考思路

8765平台如何区分前后摄电压不一致（以DVDD为例）可以参考思路
首先，8765pmu使用的是MT6357，camera电压dvdd，iovdd，avdd，af都是pmu供电，找到其pmu规格书，查到dvdd控制的电压pin对应的寄存器为
RG_VCAMD_VOSEL（一般是大写，直接搜vcamd），
搜索kernel/drivers/misc/mediatek/pmic/mt6357/v1/pmic_api.c （8765平台是在这，其他平台以此类推out编译中的pmic目录）
./kernel-4.4/drivers/misc/mediatek/pmic/mt6357/v1/pmic_api.c:49733:unsigned int mt6357_upmu_set_rg_vcamd_vosel(unsigned int val)
定义如下：
4’b0100: 1.0V
4’b0101: 1.1V
4’b0110: 1.2V
4’b0111: 1.3V
4’b1001: 1.5V
4’b1100: 1.8V
然后开始修改前后摄电压，轮询不同摄像头pin脚的时候去写pmic寄存器的方法：
ppwr_info->pin = 4的时候刚好是dvdd的电，enum枚举在：
enum IMGSENSOR_HW_PIN {
IMGSENSOR_HW_PIN_NONE = 0,
IMGSENSOR_HW_PIN_PDN,
IMGSENSOR_HW_PIN_RST,
IMGSENSOR_HW_PIN_AVDD,
IMGSENSOR_HW_PIN_DVDD,
IMGSENSOR_HW_PIN_DOVDD,
IMGSENSOR_HW_PIN_AFVDD,
#ifdef MIPI_SWITCH
IMGSENSOR_HW_PIN_MIPI_SWITCH_EN,
IMGSENSOR_HW_PIN_MIPI_SWITCH_SEL,
#endif
IMGSENSOR_HW_PIN_MCLK,

IMGSENSOR_HW_PIN_MAX_NUM,
IMGSENSOR_HW_PIN_UNDEF = -1
};

修改如下：
+++ b/kernel-4.4/drivers/misc/mediatek/imgsensor/src/common/v1/imgsensor_hw.c
@@ -20,6 +20,10 @@

#include “imgsensor_sensor.h”
#include “imgsensor_hw.h”
+extern unsigned int mt6357_upmu_set_rg_vcamd_vosel(unsigned int val);
+
+char curr_sensor_name_kzh[64];
+

char *imgsensor_sensor_idx_name[IMGSENSOR_SENSOR_IDX_MAX_NUM] = {
IMGSENSOR_SENSOR_IDX_NAME_MAIN,
@@ -108,14 +112,31 @@ static enum IMGSENSOR_RETURN imgsensor_hw_power_sequence(
if (pwr_status == IMGSENSOR_HW_POWER_STATUS_ON &&
ppwr_info->pin != IMGSENSOR_HW_PIN_UNDEF) {
pdev = phw->pdev[psensor_pwr->id[ppwr_info->pin]];

• PK_DBG(“sensor_idx = %d, pin=%d, pin_state_on=%d, hw_id =%d(0:PMIC, 1:GPIO, 2:exGPIO 3:mclk)\n”,

• printk(“kzhkzhkzh sensor_idx = %d, pin=%d, pin_state_on=%d, hw_id =%d(0:PMIC, 1:GPIO, 2:exGPIO 3:mclk)\n”,
  sensor_idx, ppwr_info->pin, ppwr_info->pin_state_on, psensor_pwr->id[ppwr_info->pin]);

• if (pdev->set != NULL)

• if (pdev->set != NULL){

• pdev->set(pdev->pinstance,
  sensor_idx,
  ppwr_info->pin,
  ppwr_info->pin_state_on);

• }

• if(((0 == sensor_idx )&& (ppwr_info->pin == 4))&& (0 == strcmp(“gc5025_mipi_raw”,curr_sensor_name_kzh))){

• mt6357_upmu_set_rg_vcamd_vosel(0x09);

• printk(“curr_sensor_name_kzh:%s 5025 kzhkzhkzh**********\n”,curr_sensor_name_kzh);

• //return IMGSENSOR_RETURN_SUCCESS;

• }else if(((1 == sensor_idx )&& (ppwr_info->pin == 4))&& (0 == strcmp(“gc2385_mipi_raw”,curr_sensor_name_kzh))){

• mt6357_upmu_set_rg_vcamd_vosel(0x06);

• printk(“curr_sensor_name_kzh:%s 2385 kzhkzhkzh**********\n”,curr_sensor_name_kzh);

• //return IMGSENSOR_RETURN_SUCCESS;

• }

  mdelay(ppwr_info->pin_on_delay);
  }
  @@ -148,6 +169,8 @@ static enum IMGSENSOR_RETURN imgsensor_hw_power_sequence(
  return IMGSENSOR_RETURN_SUCCESS;
  }

enum IMGSENSOR_RETURN imgsensor_hw_power(
struct IMGSENSOR_HW *phw,
struct IMGSENSOR_SENSOR *psensor,
@@ -189,7 +212,8 @@ enum IMGSENSOR_RETURN imgsensor_hw_power(

#endif*/

• PK_DBG(“sensor_idx %d, power %d curr_sensor_name %s\n”, sensor_idx, pwr_status, curr_sensor_name);

• strcpy(curr_sensor_name_kzh,curr_sensor_name);
• printk(“curr_sensor_name_kzh:%s kkkkkkkzhkzh sensor_idx %d, power %d curr_sensor_name %s\n”,curr_sensor_name_kzh, sensor_idx, pwr_status, curr_sensor_name);

imgsensor_hw_power_sequence(phw,
sensor_idx,
diff --git a/kernel-4.4/drivers/misc/mediatek/imgsensor/src/mt6739/camera_hw/imgsensor_cfg_table.c b/kernel-4.4/drivers/misc/mediatek/imgsensor/src/mt6739/camera_hw/imgsensor_cfg_table.c
index 1f20e0a…6268a7b 100755
— a/kernel-4.4/drivers/misc/mediatek/imgsensor/src/mt6739/camera_hw/imgsensor_cfg_table.c
+++ b/kernel-4.4/drivers/misc/mediatek/imgsensor/src/mt6739/camera_hw/imgsensor_cfg_table.c
@@ -134,7 +134,7 @@ struct IMGSENSOR_HW_POWER_SEQ sensor_power_sequence[] = {
{PDN, Vol_Low, 1},
{RST, Vol_Low, 10},
{AVDD, Vol_2800, 5},

• {DVDD, Vol_1500, 5},

• {DVDD, Vol_1200, 5},
  {DOVDD, Vol_1800, 5},
  {AFVDD, Vol_2800, 5},
  {PDN, Vol_High, 5},
  @@ -149,7 +149,7 @@ struct IMGSENSOR_HW_POWER_SEQ sensor_power_sequence[] = {
  {RST, Vol_Low, 0},
  {DOVDD, Vol_1800, 0},
  {AVDD, Vol_2800, 0},

• {DVDD, Vol_1200, 0},

• {DVDD, Vol_1500, 0},
  // {AFVDD, Vol_2800, 1},
  {PDN, Vol_High, 0},
  {RST, Vol_High, 5}
  @@ -190,7 +190,7 @@ struct IMGSENSOR_HW_POWER_SEQ sensor_power_sequence[] = {
  {RST, Vol_Low, 10},
  {AFVDD, Vol_2800, 5},
  {DOVDD, Vol_1800, 5},

• {DVDD, Vol_1200, 5},

• {DVDD, Vol_1500, 5},
  {AVDD, Vol_2800, 5},
  {PDN, Vol_High, 5},
  {RST, Vol_High, 5}
  由于使用的较新的架构，直接在imgsensor_cfg_table.c修改其前后摄dvdd电压如果不一致切换测量pin脚电压会使用最高的电压，似乎在8766/8788平台也有此问题。