i.MX8QM HDMI to out display

[lizboxy]

1）下载官方L4.14.98_2.0.0_ga_images_MX8QMMEK中的fsl-image-validation-imx-imx8qmmek.sdcard下载自己设计的电路板中HDMI没有显示，请教这个镜像本身是支持HDMI显示吗，或者需要uboot启动后设置HDMI显示环境变量。

下载文件方法是：自己制作flash.bin,然后使用命令：uuu -b emmc_all flash.bin fsl-image-validation-imx-imx8qmmek.sdcard

2）如果默认镜像不支持HDMI显示，主要修改那些地方？

3）fsl-image-validation-imx-imx8qmmek.sdcard这个文件可以用已经编译好的内核和设备树替换生成吗？

[joanxie]

i.mx8qm supports dual channel lvds, you can use imx8qm-mek-jdi-wuxga-lvds1-panel.dtb to support this panel, if you use this panel, you can set dtb file as imx8qm-mek-jdi-wuxga-lvds1-panel.dtb, the dual channel is like this:

[lizboxy]

And any driver for the EDP 9" panel with 1536x2048-25Hz?

[joanxie]

current bsp doesn't has this, customers need to porting by themselves

[joanxie]

1)yes, which port do you use? you can use mipi lvds port with LVDS to HDMI converter board or mipi dsi port with MIPI-DSI to HDMI converter board

3）you can built your own sd card image, pls refer to the sd card layout link as below, but I suggest that you can download image to your board by uuu separately

"meta-fsl-arm/image_types_fsl.bbclass at master · Freescale/meta-fsl-arm · GitHub "

[lizboxy]

OK, It's all done,TKs!

But now,so how to change the Default Display to  dual MIPI DSI Panel?

[joanxie]

as  I known, the default image "Image-imx8qmmek.bin" and dtb file "fsl-imx8qm-mek.dtb" support this already

[lizboxy]

I am using the BSP Linux 4.19.35_1.1.0 which I compile in yocto。

I have changed DSI phy/DSI bridge status from “disable” to “okay”, but did’t work.

How can I port My DSI panel driver? My DSI Panel is dual mipi-DSI panel.

mipi_dsi_phy1: dsi_phy@56228300 {

                   #address-cells = <1>;

                   #size-cells = <0>;

                   compatible = "mixel,imx8qm-mipi-dsi-phy";

                   reg = <0x0 0x56228300 0x0 0x100>;

                   power-domains = <&pd_mipi0>;

                   #phy-cells = <0>;

                   /*status = "disabled";*/

                   status = "okay";

         };

         mipi_dsi1: mipi_dsi@56228000 {

                   compatible = "fsl,imx8qm-mipi-dsi";

                   clocks =

                            <&clk IMX8QM_MIPI0_PXL_CLK>,

                            <&clk IMX8QM_MIPI0_BYPASS_CLK>,

                            <&clk IMX8QM_MIPI0_DSI_PHY_CLK>;

                   clock-names = "pixel", "bypass", "phy_ref";

                   power-domains = <&pd_mipi0>;

                   csr = <&mipi_dsi_csr1>;

                   phys = <&mipi_dsi_phy1>;

                   phy-names = "dphy";

                   pwr-delay = <100>;

                   /*status = "disabled";*/

                   status = "okay";

                   port@0 {

                            mipi_dsi1_in: endpoint {

                                     remote-endpoint = <&dpu1_disp0_mipi_dsi>;

                            };

                   };

                   port@1 {

                            mipi_dsi1_out: endpoint {

                                     remote-endpoint = <&mipi_dsi_bridge1_in>;

                            };

                   };

         };

         mipi_dsi_bridge1: mipi_dsi_bridge@56228000 {

                   #address-cells = <1>;

                   #size-cells = <0>;

                   compatible = "nwl,mipi-dsi";

                   reg = <0x0 0x56228000 0x0 0x300>;

                   interrupts = <16 IRQ_TYPE_LEVEL_HIGH>;

                   interrupt-parent = <&irqsteer_dsi0>;

                   clocks =

                            <&clk IMX8QM_MIPI0_BYPASS_CLK>,

                            <&clk IMX8QM_MIPI0_DSI_TX_ESC_CLK>,

                            <&clk IMX8QM_MIPI0_DSI_RX_ESC_CLK>;

                   clock-names = "phy_ref", "tx_esc", "rx_esc";

                   assigned-clocks = <&clk IMX8QM_MIPI0_DSI_TX_ESC_DIV>,

                                       <&clk IMX8QM_MIPI0_DSI_RX_ESC_DIV>;

                   assigned-clock-rates = <18000000>, <72000000>;

                   power-domains = <&pd_mipi0>;

                   phys = <&mipi_dsi_phy1>;

                   phy-names = "dphy";

                   /*status = "disabled";*/

                   status = "okay";

                   port@0 {

                            mipi_dsi_bridge1_in: endpoint {

                                     remote-endpoint = <&mipi_dsi1_out>;

                            };

                   };

         };

THX

[joanxie]

 what do you mean dual mipi-DSI panel? do you need to use two panels? or one panel has dual channel? if you need to support two mipi dsi panel, as I mentioned before, you don't need to change dts, the default image supports this already

[lizboxy]

由于屏比较大，所以选了Dual-Mipi屏来显示，现在Driver应该OK了，可以显示了，但两个MIPI通道在一个屏上显示两个一样的图像，我理解这个现象应该是两个MIPI口的输出都是独立的，好像没有做内部切割和拼接的驱动吧？

但开机logo如何处理？ 

目前有看到RK3399/MTK都有选这种Dual-Mipi屏，而且其驱动也应该写好的Driver，可以直接输出在一个大屏显示；MTK的Dual-MIPI的显示是在mipi_dsi_bridge里定义，i.MX8QM是否有对应drvier,是否在nwl,mipi-dsi里定义？

最后还有按照ModeText工具有测试：从结果上讲，屏的左右两边可以输出显示两个不同的图像，所以请帮忙看看如何解决logo的整屏显示，还有实时动态图像如何处理？还是必须把两个图像通过视频处理切割后再通过两个独立的MIPI拼接起来显示？谢谢！

Run modetest -M imx-drm -s 146:1536x2048-25 -s 148:1536x2048-25 ,Screen show picture as left.

Run modetest -M imx-drm -s 146:1536x2048-25, Screen show picture as right.

root@imx8qmmek:~# modetest -M imx-drm -s 146:1536x2048-25 -s 148:1536x2048-25
setting mode 1536x2048-25Hz@XR24 on connectors 146, crtc 36
failed to set gamma: Function not implemented
setting mode 1536x2048-25Hz@XR24 on connectors 148, crtc 94
failed to set gamma: Function not implemented

root@imx8qmmek:~# modetest -M imx-drm -s 146:1536x2048-25
setting mode 1536x2048-25Hz@XR24 on connectors 146, crtc 36
failed to set gamma: Function not implemented