i.MX ProcessorsのトピックRe: How to configure ADV7182 decoder with IMX6ull processor?

How to configure ADV7182 decoder with IMX6ull processor?

riguangpeng — Wed, 06 Nov 2019 06:04:28 GMT

Hello everyone,

I have a custom board that has an IMX6ull processor and it is connected to a video decoder ADV7182. The version of linux kernel is 4.1.15. I want to configure it to capture video from an analogue camera.

Can you help me how to configure the kernel or how to patch the linux kernel?

Re: How to configure ADV7182 decoder with IMX6ull processor?

weidong_sun — Wed, 06 Nov 2019 07:19:09 GMT

Hi riguang peng,

Our i.MX6QDL Sabreauto EVK supports ADV7180, you can refer to it for your design.

arch/arm/boot/dts/imx6qdl-sabreauto.dtsi

... ...

        i2c@1 {
            #address-cells = <1>;
            #size-cells = <0>;
            reg = <1>;

            adv7180: adv7180@21 {
                compatible = "adv,adv7180";
                reg = <0x21>;
                pinctrl-names = "default";
                pinctrl-0 = <&pinctrl_ipu1_1>;
                clocks = <&clks IMX6QDL_CLK_CKO>;
                clock-names = "csi_mclk";
                DOVDD-supply = <&reg_3p3v>; /* 3.3v, enabled via 2.8 VGEN6 */
                AVDD-supply = <&reg_3p3v>; /* 1.8v */
                DVDD-supply = <&reg_3p3v>; /* 1.8v */
                PVDD-supply = <&reg_3p3v>; /* 1.8v */
                pwn-gpios = <&max7310_b 2 0>;
                csi_id = <0>;
                mclk = <24000000>;
                mclk_source = <0>;
                cvbs = <1>;
            };

... ...

adv7180 driver:

linux_top/drivers/media/platform/mxc/capture/adv7180.c

Have a nice day!

BR,

Weidong

Re: How to configure ADV7182 decoder with IMX6ull processor?

riguangpeng — Thu, 07 Nov 2019 01:11:23 GMT

Hi Wigros Sun, Thank you!

Now, I config my dts as flowing:

&i2c2 {
clock_frequency = <100000>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_i2c2>;
status = "okay";

adv7182: adv7182@20 {
compatible = "adv,adv7180";
reg = <0x20>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_csi1>;
clocks = <&clks IMX6UL_CLK_CSI>;
clock-names = "csi_mclk";
//pwn-gpios = <&gpio_spi 6 1>;
//rst-gpios = <&gpio_spi 5 0>;
csi_id = <0>;
//mclk = <24000000>;
//mclk_source = <0>;
mclk = <28636300>;
mclk_source = <0>;
status = "okay";

port {
adv7182_ep: endpoint {
remote-endpoint = <&csi1_ep>;
};
};
};
};

&csi {
status = "okay";
//pinctrl-names = "default";
//pinctrl-0 = <&pinctrl_csi1>;

port {
csi1_ep: endpoint {
remote-endpoint = <&adv7182_ep>;
};
};
};

then I patch the mx6s_capture.c according to 0001-Enable-CSI-support-BT656-interlace-and-add-adv7180.patch.zip, I do not change the drivers/media/platform/mxc/capture/adv7180.c.

Do you have any other advice?

Re: How to configure ADV7182 decoder with IMX6ull processor?

weidong_sun — Thu, 07 Nov 2019 05:45:00 GMT

Hi，

你的硬件连接方式，要和dts里的节点对应上。

pwn-gpios
rst-gpios

这2个是电源控制和reset控制，你的电路上没有吗？

ADV7180的驱动里会读取和处理dts节点里的配置，然后再处理。你要根据你的硬件配置节点，而且要微调一下adv7180.c

weidong

Re: How to configure ADV7182 decoder with IMX6ull processor?

riguangpeng — Thu, 07 Nov 2019 06:10:03 GMT

硬件设计上是有的，我配置上！还有就是时钟频率是24M吧。

Re: How to configure ADV7182 decoder with IMX6ull processor?

weidong_sun — Thu, 07 Nov 2019 06:35:08 GMT

这是Sabre AI板子上的ADV7180电路，和你的对比一下配置，它的dts怎么配置，你的就怎么配置。第12页。

Re: How to configure ADV7182 decoder with IMX6ull processor?

riguangpeng — Thu, 07 Nov 2019 07:05:00 GMT

好的，谢谢哦。

Re: How to configure ADV7182 decoder with IMX6ull processor?

riguangpeng — Fri, 22 Nov 2019 08:36:43 GMT

现在我的视频流能够出来了，但是颜色不对，感觉是ADV7182A寄存器配置的问题，请指导怎样配置

Re: How to configure ADV7182 decoder with IMX6ull processor?

weidong_sun — Mon, 25 Nov 2019 01:32:45 GMT

Hi,

关于ADV7182A寄存器配置的问题，你最好能够请求ADI的FAE或者他们代理的FAE来帮你配置，因为不是我们的芯片，我们也没有原厂熟悉。

另外使用模拟摄像机，你需要注意

（1）制式一致性

摄像头制式(PAL,NTSC）, ADV7182A制式配置，mxc_v4l2_capture.c（这是CPU端捕获驱动）中制式跟踪一下，三者是否是一致的；

（2）YUV输出协议

一般我们都会用BT.656格式输出，那么VSYN/ HSYNC都会编码在data的8bit数据线上，你不需要外部连接HSYNC/VSYNC信号。

（3）camera的上电

我们要求camera先上电，对你的系统来说，就是camera和ADV7182A先上电。

你先按照上面的建议检查一下，然后再请去寻求相关支持。

Have a nice day!

BR,

Weidong

Re: How to configure ADV7182 decoder with IMX6ull processor?

riguangpeng — Mon, 25 Nov 2019 02:46:06 GMT

技术支持：你好！

已经初步这个问题，是由于RGB三个颜色都缺色的问题，data0-data7上都有数据信号，具体是哪里的问题，还在分析中，另外还有一个问题，就是视频的延迟比较大，在1S秒左右，这个延迟优化有什么建议吗？