全志芯片的OV5640摄像头寄存器问题?

2505300733 · 2019-11-11 20:58:06

说明：
全志芯片A40I，里面我移植了Android6的系统进去里面，就是想着跑OV5640这款摄像头（强制要求没办法啊），发现这款芯片本来提供的SDK是挺坑
的所以就去换系统咯。

问题：按照常规设置摄像头功能的文件，首先是sys_config.fex 然后到camera.cfg里面设置。然后启动机器的时候就会打印出这些东东：

[ 7.802426] [VFE]cci_init end
[ 7.869404] [VFE]Welcome to Video Front End driver
[ 7.875171] [VFE]csi0 probe end!
[ 7.878866] [VFE]csi1 probe end!
[ 7.883451] [VFE]csi_init end
[ 7.887689] [VFE]sunxi_isp_platform_register end
[ 7.893807] [VFE]mipi_init end
[ 7.897174] [VFE]flash_init end
[ 7.902770] [VFE]pdev->id = 0
[ 7.906008] [VFE]dev->cci_sel = 0
[ 7.909626] [VFE]dev->csi_sel = 0
[ 7.913467] [VFE]dev->mipi_sel = 0
[ 7.917180] [VFE]dev->isp_sel = 0
[ 7.920959] [VFE_WARN]fetch csi0_dev0_iovdd from device_tree failed
[ 7.927812] [VFE_WARN]fetch csi0_dev0_avdd from device_tree failed
[ 7.934800] [VFE_WARN]fetch csi0_dev0_dvdd from device_tree failed
[ 7.941680] [VFE_WARN]fetch csi0_dev0_afvdd from device_tree failed
[ 7.948532] [VFE_WARN]fetch csi0_dev0_power_en from device_tree failed
[ 7.955938] [VFE_WARN]fetch csi0_dev0_flash_en from device_tree failed
[ 7.963200] [VFE_WARN]fetch csi0_dev0_flash_mode from device_tree failed
[ 7.970760] [VFE_WARN]fetch csi0_dev0_flvdd from device_tree failed
[ 7.977615] [VFE_WARN]fetch csi0_dev0_flvdd_vol from device_tree failed
[ 7.985094] [VFE_WARN]fetch csi0_dev0_af_pwdn from device_tree failed
[ 7.993314] [VFE]vfe_init end
[ 8.000076] [VFE]probe_work_handle start!
[ 8.004810] [VFE]vfe_runtime_resume
[ 8.021038] [VFE]..........................vfe clk open!.......................
[ 8.029102] [VFE]v4l2 subdev register input_num = 0
[ 8.034768] [VFE]vfe sensor detect start! input_num = 0
[ 8.068914] [VFE]Find sensor name is "ov5640", i2c address is 78, type is "YUV" !
[ 8.077247] [VFE]Sub device register "ov5640" i2c_addr = 0x78 start!
[ 8.085713] [VFE]registered sensor subdev is OK!
[ 8.090878] [VFE]Check sensor!
[ 8.107560] [VFE]mclk on
[ 8.340247] wifi_platform_bus_enumerate device present 1
[ 8.432798] [VFE]mclk off
[ 8.472337] [VFE]Sub device register "ov5640" is OK!
[ 8.479139] [VFE]V4L2 device registered as video0
[ 8.484491] [VFE]vfe_runtime_suspend
[ 8.488407] [VFE]..........................vfe clk close!.......................
[ 8.503271] [VFE]probe_work_handle end!

由上面的打印信息所显示，I2C是已经启动了，并且能识别到这个摄像头的类型和这个摄像头的地址。并且将其注册为video0。也成功了
但是后面操作一个寄存器地址的时候一直提示错误。
[ 57.281711] [VFE]mclk on
[ 57.486244] twi_stop()407 - [i2c3] i2c state(0x00000000) isn't idle(0xf8)
[ 57.493701] sunxi_i2c_core_process()765 - [i2c3] STOP failed!
[ 57.500270] num = 1 ret = 255
[ 57.503734] sunxi_i2c_do_xfer()909 - [i2c3] incomplete xfer (status: 0xff, dev addr: 0x3c)
[ 57.513158] i2c_transfet_return = -70 eroor appear
[ 57.518922] [VFE_DEV_I2C_ERR]cci_write_a16_d8 error! slave = 0x3c, addr = 0x568d, value = 0x ae
ov5640 sensor write retry=1

并且我具体定位到了这个寄存器在哪一个位置：（但是并不知道这个寄存器干啥的为什么会出现错误），还定位到了具体发生错误的是在i2c-sunxi.c文件里面的一个 int sunxi_i2c_do_xfer(struct sunxi_i2c *i2c, struct i2c_msg *msgs, int num) 函数。但是对于V4L2的I2C流程不是很熟悉。需要大神帮忙看一下
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