1) Motherboard is my own design and layout, I tested the HDMI HDP pin can receive 3.3V high signal. The screen is no problem, I have tested the screen on the Raspberry Pi and the computer.
2) source code from Yocto (https://source.codeaurora.org/external/imx/linux-imx.git version: c27010d99a3d91703ea2d1a3f9630a9dedc3f86f From:./meta-fsl-bsp-release/imx/meta-bsp/recipes-kernel/linux/linux-imx_4.9.11.bb fsl-arm-yocto-bsp.git - i.MX Linux BSP Release Yocto Project manifests ), LCD can display, HDMI is temporarily not working properly.check /proc/interrupts tell me zero interrupt trigger times.
3) When I check /sys/devices/soc0/soc/20e0000.hdmi_video/cable_state, always show plugout
4) HDMI.PHY_STAT0.HPD check, found to be 1 when plugin screen, 0 when plugout.
5) HDMI.IH_PHY_STAT0.HDP check, always 0.
6) HDMI.IH_MUTE_PHY_STAT0.HDP check is always 1, write 0 can't trigger the interrupt.
7) HDMI.IH_MUTE is always 0x00
8) HDMI.PHY_MASK0.HPD is always 1, write 0 is not useful.
My design:
My Kernel Log:
[ 0.550486] mxc_hdmi 20e0000.hdmi_video: hdcp disable
[ 0.550709] 20e0000.hdmi_video supply HDMI not found, using dummy regulator
[ 0.690810] mxc_hdmi 20e0000.hdmi_video: mxc_hdmi_disp_init
[ 0.690828] mxc_hdmi 20e0000.hdmi_video: mxc_hdmi_disp_init - default mode (null) bpp=24
[ 0.690894] mxc_hdmi 20e0000.hdmi_video: Enabled HDMI clocks
[ 0.690907] mxc_hdmi 20e0000.hdmi_video: Detected HDMI controller 0x13:0xa:0xa0:0xc1
[ 0.691039] mxc_hdmi 20e0000.hdmi_video: mxc_hdmi_disp_init exit
[ 0.691049] mxc_sdc_fb fb@1: registered mxc display driver hdmi
[ 2.225238] mxc_hdmi_cec soc:hdmi_cec@00120000: HDMI CEC initialized
[ 3.888591] fsl-hdmi-dai soc:hdmi_audio@00120000: failed to probe. Load HDMI-video first.
[ 3.895505] fsl-hdmi-dai: probe of soc:hdmi_audio@00120000 failed with error -12
[ 3.904789] imx-audio-hdmi sound-hdmi: initialize HDMI-audio failed. load HDMI-video first!
My dts Configure:
aliases {
mxcfb0 = &mxcfb1;
mxcfb1 = &mxcfb2;
};mxcfb2: fb@1 {
compatible = "fsl,mxc_sdc_fb";
disp_dev = "hdmi";
interface_pix_fmt = "RGB24";
default_bpp = <24>;
int_clk = <0>;
late_init = <0>;
status = "okay";};
&dcic1 {
dcic_id = <0>;
dcic_mux = "dcic-hdmi";
status = "okay";
};&hdmi_cec {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_hdmi_cec>;
status = "okay";
};&hdmi_core {
ipu_id = <0>;
disp_id = <0>;
status = "okay";
};&hdmi_video {
fsl,phy_reg_vlev = <0x0294>;
fsl,phy_reg_cksymtx = <0x800d>;
status = "okay";
};&i2c2 {
clock-frequency = <100000>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_i2c2>;
status = "okay";hdmi_edid: edid@50 {
compatible = "fsl,imx6-hdmi-i2c";
reg = <0x50>;
};
};pinctrl_hdmi_cec: hdmicecgrp {
fsl,pins = <
MX6QDL_PAD_KEY_ROW2__HDMI_TX_CEC_LINE 0x108b0
>;
};pinctrl_hdmi_hdcp: hdmihdcpgrp {
fsl,pins = <
MX6QDL_PAD_KEY_COL3__HDMI_TX_DDC_SCL 0x4001b8b1
MX6QDL_PAD_KEY_ROW3__HDMI_TX_DDC_SDA 0x4001b8b1
>;
};
