AM625: AM62x enables LVDS exception

add log:

root@sbc7138:~# dmesg | grep dss
[   10.444403] platform 30200000.dss: Fixed dependency cycle(s) with /bus@f0000/i2c@20010000/sii9022@3b
[   10.474710] platform 30200000.dss: Fixed dependency cycle(s) with /panel_lvds
[   10.482071] platform panel_lvds: Fixed dependency cycle(s) with /bus@f0000/dss@30200000
[   11.215104] platform 30200000.dss: Fixed dependency cycle(s) with /bus@f0000/i2c@20010000/sii9022@3b
[   11.230782] i2c 1-003b: Fixed dependency cycle(s) with /bus@f0000/dss@30200000
[   18.991271] Modules linked in: ti_k3_r5_remoteproc(+) rti_wdt(+) k3_j72xx_bandgap(+) j721e_csi2rx videobuf2_dma_contig tidss sii902x drm_dma_helper videobuf2_memops videobuf2_v4l2 m_can_platform videobuf2_common drm_kms_helper v4l2_async m_can ti_k3_m4_remoteproc syscopyarea sysfillrect sysimgblt fb_sys_fops ti_k3_common videodev can_dev drm pruss mcrc sa2ul snd_soc_davinci_mcasp snd_soc_ti_udma snd_soc_ti_edma mc cdns_dphy_rx snd_soc_ti_sdma snd_soc_tlv320aic3x_i2c pwm_tiehrpwm snd_soc_tlv320aic3x drm_panel_orientation_quirks optee_rng rng_core pwm_bl ip_tables x_tables ipv6
[   32.872677] platform 30200000.dss: deferred probe pending

Which SDK are you using?
Can you please take reference from this example in the SDK: https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/arch/arm64/boot/dts/ti/k3-am625-sk-microtips-mf101hie-panel.dtso?h=ti-linux-6.12.y and create you dts this way, with panel timings defined in panel-simple.c or equivalent.

Are you using single-link or dual-link LVDS?
Is it a custom board?
Also share results of the following:

kmsprint
modetest -M tidss
kmstest

When you run kmstest, also share what you see on screen.

    Thank you very much for your reply. I haven't reached the lvds display section yet. Currently, the PWM backlight has no output.

    I have to manually execute the command to control it in order to activate the backlight.

   Could it be a problem with the backlight driver?

cat /sys/class/backlight/backlight-lvds/actual_brightness
255
root@sbc7138:~# 
root@sbc7138:~# cat /sys/class/backlight/backlight-lvds/bl_power
4
root@sbc7138:~# 
root@sbc7138:~# cat /sys/kernel/debug/pwm
platform/23010000.pwm, 2 PWM devices
 pwm-0   (backlight-lvds      ): requested period: 1000000 ns duty: 0 ns polarity: normal
 pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normal
root@sbc7138:~# 
root@sbc7138:~# 
root@sbc7138:~# dmesg | grep pwm
[   10.454584] platform 23010000.pwm: Fixed dependency cycle(s) with /bus@f0000/pwm@23010000
root@sbc7138:~# 
root@sbc7138:~# echo 0 > /sys/class/backlight/backlight-lvds/bl_power
root@sbc7138:~# 
root@sbc7138:~# cat /sys/kernel/debug/pwm
platform/23010000.pwm, 2 PWM devices
 pwm-0   (backlight-lvds      ): requested enabled period: 1000000 ns duty: 1000000 ns polarity: normal
 pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normal
root@sbc7138:~# 
root@sbc7138:~# dmesg | grep backlight
root@sbc7138:~# 

Let me get back to you by upcoming Monday

OK， Thank you very much。I'll add some more logs。

root@sbc7138:~# dmesg | grep pwm
[   10.454636] platform 23010000.pwm: Fixed dependency cycle(s) with /bus@f0000/pwm@23010000
root@sbc7138:~# 
root@sbc7138:~# dmesg | grep backlight
root@sbc7138:~# 
root@sbc7138:~# dmesg | grep lvds
[   10.464265] platform 30200000.dss: Fixed dependency cycle(s) with /panel_lvds
[   10.471622] platform panel_lvds: Fixed dependency cycle(s) with /bus@f0000/dss@30200000
root@sbc7138:~# 
root@sbc7138:~# dmesg | grep dss
[   10.464265] platform 30200000.dss: Fixed dependency cycle(s) with /panel_lvds
[   10.471622] platform panel_lvds: Fixed dependency cycle(s) with /bus@f0000/dss@30200000
[   19.314492] Modules linked in: rtc_ti_k3(+) dwc3_am62 ti_k3_r5_remoteproc(+) k3_j72xx_bandgap(+) rti_wdt(+) tidss m_can_platform m_can ti_k3_m4_remoteproc ti_k3_common drm_dma_helper j721e_csi2rx can_dev drm_kms_helper syscopyarea videobuf2_dma_contig sysfillrect sysimgblt fb_sys_fops videobuf2_memops snd_soc_davinci_mcasp videobuf2_v4l2 snd_soc_ti_udma videobuf2_common snd_soc_ti_edma v4l2_async drm cdns_dphy_rx pruss snd_soc_ti_sdma videodev mc sa2ul mcrc drm_panel_orientation_quirks snd_soc_tlv320aic3x_i2c snd_soc_tlv320aic3x optee_rng rng_core ip_tables x_tables ipv6
[   19.646650] [drm] Initialized tidss 1.0.0 20180215 for 30200000.dss on minor 0
[   19.770502] tidss 30200000.dss: [drm] fb0: tidssdrmfb frame buffer device
root@sbc7138:~# 
root@sbc7138:~# lsmod | grep lvds
panel_lvds             16384  0
drm                   561152  5 drm_kms_helper,drm_dma_helper,tidss,panel_lvds
root@sbc7138:~# 
root@sbc7138:~# lsmod | grep pwm
root@sbc7138:~# 

  I have now modified my dts file. The backlight can now be lit up.

  The system has recognized the LVDS device, but there is no display output.

  The CLK signal for testing LVDS is also not there.

The following is my DTS:

#include <dt-bindings/pwm/pwm.h>
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/irq.h>
#include "k3-pinctrl.h"
#include "k3-am62x-sk-common.dtsi"

&{/} {  
    backlight_lvds: backlight-lvds {
		compatible = "pwm-backlight";
		pwms = <&epwm1 0 1000000 0>; 
		brightness-levels = <
              0  20  20  21  21  22  22  23
             23  24  24  25  25  26  26  27
             27  28  28  29  29  30  30  31
             31  32  32  33  33  34  34  35
             35  36  36  37  37  38  38  39
             40  41  42  43  44  45  46  47
             48  49  50  51  52  53  54  55
             56  57  58  59  60  61  62  63
             64  65  66  67  68  69  70  71
             72  73  74  75  76  77  78  79
             80  81  82  83  84  85  86  87
             88  89  90  91  92  93  94  95
             96  97  98  99 100 101 102 103
            104 105 106 107 108 109 110 111
            112 113 114 115 116 117 118 119
            120 121 122 123 124 125 126 127
            128 129 130 131 132 133 134 135
            136 137 138 139 140 141 142 143
            144 145 146 147 148 149 150 151
            152 153 154 155 156 157 158 159
            160 161 162 163 164 165 166 167
            168 169 170 171 172 173 174 175
            176 177 178 179 180 181 182 183
            184 185 186 187 188 189 190 191
            192 193 194 195 196 197 198 199
            200 201 202 203 204 205 206 207
            208 209 210 211 212 213 214 215
            216 217 218 219 220 221 222 223
            224 225 226 227 228 229 230 231
            232 233 234 235 236 237 238 239
            240 241 242 243 244 245 246 247
            248 249 250 251 252 253 254 255
        >;
        default-brightness-level = <255>;
		enable-gpios = <&main_gpio0 41 GPIO_ACTIVE_HIGH>; 
		power-supply = <&vcc_3v3_sys>;	
    };


    panel_lvds: panel_lvds {
        compatible = "microtips,mf-101hiebcaf0", "panel-simple";
        backlight = <&backlight_lvds>;
        lable = "LVDS";
        data-mapping = "vesa-24";
        width-mm = <229>;
        height-mm = <149>;
		
        panel-timing {
            clock-frequency = <71100000>;
            hactive = <1280>;
            vactive = <800>;

            hback-porch = <88>;
            hfront-porch = <70>;

            vback-porch = <21>;
            vfront-porch = <15>;

            hsync-len = <4>;
            vsync-len = <4>;

            hsync-active = <0>;
            vsync-active = <0>;

            de-active = <0>;
            pixelclk-active = <0>;
        };

		ports {
			port@0 {
				lvds_in0: endpoint {
					remote-endpoint = <&lvds_out0>;
				};
			};
		};
    };
};

&dss {
    pinctrl-names = "default";
    pinctrl-0 = <&main_oldi0_pins_default>;
    status  = "okay";
};

&dss_ports {
    port@0 {
        reg = <0>;
        lvds_out0: endpoint {
            remote-endpoint = <&lvds_in0>;
        };
    };
};

&epwm1 {
    pinctrl-names = "default";
	pwms = <&epwm1 0 20000 0>; 
    pinctrl-0 = <&main_epwm1_a_pins_default>;
    status  = "okay";
};

&main_pmx0 {
    main_epwm1_a_pins_default: main-epwm1-a-pins-default {
        pinctrl-single,pins = <
            AM62X_IOPAD(0x19c, PIN_OUTPUT, 6) /* (B18) MCASP0_AXR1.EHRPWM1_A */			
        >;
    };

	pwmenable_pins_default: pwmenable-default-pins {
		pinctrl-single,pins = <
			/* PWM pin set */
			AM62X_IOPAD(0x0094, PIN_INPUT_PULLDOWN, 7) /* (N20) GPMC0_BE1n.GPIO0_36  sbc7138-AM6254_BKLT_PWM_DC_SEL */
			AM62X_IOPAD(0x00a4, PIN_INPUT_PULLDOWN, 7) /* (M22) GPMC0_DIR.GPIO0_40   sbc7138-AM6254_BKLT_PWM_VO_EN  */
			AM62X_IOPAD(0x00a8, PIN_INPUT_PULLUP, 7) /* (M21) GPMC0_CSn0.GPIO0_41    sbc7138-AM6254_BKLT_ON         */
			AM62X_IOPAD(0x00ac, PIN_INPUT_PULLDOWN, 7) /* (L21) GPMC0_CSn1.GPIO0_42  sbc7138-AM6254_BKLT_EN_VO_SEL  */
			/* PWM pin set END */
		>;
	};

	main_oldi0_pins_default: main-oldi0-pins-default {
        pinctrl-single,pins = <
            AM62X_IOPAD(0x0260, PIN_OUTPUT, 0) /* (AA5) OLDI0_A0N */
            AM62X_IOPAD(0x025c, PIN_OUTPUT, 0) /* (Y6) OLDI0_A0P */
            AM62X_IOPAD(0x0268, PIN_OUTPUT, 0) /* (AD3) OLDI0_A1N */
            AM62X_IOPAD(0x0264, PIN_OUTPUT, 0) /* (AB4) OLDI0_A1P */
            AM62X_IOPAD(0x0270, PIN_OUTPUT, 0) /* (Y8) OLDI0_A2N */
            AM62X_IOPAD(0x026c, PIN_OUTPUT, 0) /* (AA8) OLDI0_A2P */
            AM62X_IOPAD(0x0278, PIN_OUTPUT, 0) /* (AB6) OLDI0_A3N */
            AM62X_IOPAD(0x0274, PIN_OUTPUT, 0) /* (AA7) OLDI0_A3P */
            AM62X_IOPAD(0x0280, PIN_OUTPUT, 0) /* (AC6) OLDI0_A4N */
            AM62X_IOPAD(0x027c, PIN_OUTPUT, 0) /* (AC5) OLDI0_A4P */
            AM62X_IOPAD(0x0288, PIN_OUTPUT, 0) /* (AE5) OLDI0_A5N */
            AM62X_IOPAD(0x0284, PIN_OUTPUT, 0) /* (AD6) OLDI0_A5P */
            AM62X_IOPAD(0x0290, PIN_OUTPUT, 0) /* (AE6) OLDI0_A6N */
            AM62X_IOPAD(0x028c, PIN_OUTPUT, 0) /* (AD7) OLDI0_A6P */
            AM62X_IOPAD(0x0298, PIN_OUTPUT, 0) /* (AD8) OLDI0_A7N */
            AM62X_IOPAD(0x0294, PIN_OUTPUT, 0) /* (AE7) OLDI0_A7P */
            AM62X_IOPAD(0x02a0, PIN_OUTPUT, 0) /* (AD4) OLDI0_CLK0N */
            AM62X_IOPAD(0x029c, PIN_OUTPUT, 0) /* (AE3) OLDI0_CLK0P */
            AM62X_IOPAD(0x02a8, PIN_OUTPUT, 0) /* (AE4) OLDI0_CLK1N */
            AM62X_IOPAD(0x02a4, PIN_OUTPUT, 0) /* (AD5) OLDI0_CLK1P */
        >;
    };
};

Log:

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
root@sbc7138:~# [   25.122925] broken atomic modeset userspace detected, disabling atomic
[   26.731398] broken atomic modeset userspace detected, disabling atomic

root@sbc7138:~# cat /sys/kernel/debug/pwm
platform/23010000.pwm, 2 PWM devices
 pwm-0   (backlight-lvds      ): requested enabled period: 1000000 ns duty: 1000000 ns polarity: normal
 pwm-1   ((null)              ): period: 0 ns duty: 0 ns polarity: normal
root@sbc7138:~# 
root@sbc7138:~# cat /sys/class/backlight/backlight-lvds/actual_brightness
255
root@sbc7138:~# 
root@sbc7138:~# cat /sys/class/backlight/backlight-lvds/bl_power
0
root@sbc7138:~# 
root@sbc7138:~# ls /sys/kernel/debug/dri/0/
clients  crtc-0  framebuffer  gem_names  internal_clients  LVDS-1  name  state
root@sbc7138:~# 
root@sbc7138:~# dmesg | grep lvds
[   10.464293] platform 30200000.dss: Fixed dependency cycle(s) with /panel_lvds
[   10.471646] platform panel_lvds: Fixed dependency cycle(s) with /bus@f0000/dss@30200000
[   19.534586] panel-simple panel_lvds: supply power not found, using dummy regulator
[   20.312009] panel-simple panel_lvds: Reject override mode: panel has a fixed mode
root@sbc7138:~# 
root@sbc7138:~# dmesg | grep dss
[   10.464293] platform 30200000.dss: Fixed dependency cycle(s) with /panel_lvds
[   10.471646] platform panel_lvds: Fixed dependency cycle(s) with /bus@f0000/dss@30200000
[   19.069174] Modules linked in: rtc_ti_k3(+) dwc3_am62(+) ti_k3_r5_remoteproc(+) rti_wdt(+) tidss ti_k3_m4_remoteproc ti_k3_common drm_dma_helper j721e_csi2rx m_can_platform videobuf2_dma_contig m_can videobuf2_memops drm_kms_helper videobuf2_v4l2 videobuf2_common can_dev syscopyarea sysfillrect sysimgblt v4l2_async fb_sys_fops drm snd_soc_davinci_mcasp videodev cdns_dphy_rx drm_panel_orientation_quirks mcrc snd_soc_ti_udma sa2ul snd_soc_ti_edma mc snd_soc_ti_sdma pruss snd_soc_tlv320aic3x_i2c snd_soc_tlv320aic3x optee_rng rng_core ip_tables x_tables ipv6
[   19.834675] Modules linked in: panel_simple(+) k3_j72xx_bandgap(+) phy_can_transceiver(+) rtc_ti_k3 dwc3_am62 ti_k3_r5_remoteproc rti_wdt(+) tidss ti_k3_m4_remoteproc ti_k3_common drm_dma_helper j721e_csi2rx m_can_platform videobuf2_dma_contig m_can videobuf2_memops drm_kms_helper videobuf2_v4l2 videobuf2_common can_dev syscopyarea sysfillrect sysimgblt v4l2_async fb_sys_fops drm snd_soc_davinci_mcasp videodev cdns_dphy_rx drm_panel_orientation_quirks mcrc snd_soc_ti_udma sa2ul snd_soc_ti_edma mc snd_soc_ti_sdma pruss snd_soc_tlv320aic3x_i2c snd_soc_tlv320aic3x optee_rng rng_core ip_tables x_tables ipv6
[   20.335896] [drm] Initialized tidss 1.0.0 20180215 for 30200000.dss on minor 0
[   20.498160] tidss 30200000.dss: [drm] fb0: tidssdrmfb frame buffer device
root@sbc7138:~# 
root@sbc7138:~# dmesg | grep pwm
[   10.454636] platform 23010000.pwm: Fixed dependency cycle(s) with /bus@f0000/pwm@23010000
root@sbc7138:~# 
root@sbc7138:~# lsmod | grep lvds
root@sbc7138:~# 
root@sbc7138:~# lsmod | grep pwm
root@sbc7138:~# 

ADD log:

root@sbc7138:~# lsmod | grep panel
panel_simple           86016  0
drm                   561152  5 drm_kms_helper,panel_simple,drm_dma_helper,tidss
drm_panel_orientation_quirks    28672  1 drm
root@sbc7138:~# 
root@sbc7138:~# dmesg | grep panel
[   10.464202] platform 30200000.dss: Fixed dependency cycle(s) with /panel_lvds
[   10.471557] platform panel_lvds: Fixed dependency cycle(s) with /bus@f0000/dss@30200000
[   19.212795] Modules linked in: ti_k3_r5_remoteproc(+) rti_wdt(+) drm_dma_helper drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops j721e_csi2rx m_can_platform m_can videobuf2_dma_contig drm can_dev videobuf2_memops videobuf2_v4l2 ti_k3_m4_remoteproc(+) ti_k3_common videobuf2_common sa2ul v4l2_async drm_panel_orientation_quirks mcrc pruss snd_soc_davinci_mcasp snd_soc_ti_udma videodev snd_soc_ti_edma snd_soc_ti_sdma mc cdns_dphy_rx snd_soc_tlv320aic3x_i2c snd_soc_tlv320aic3x optee_rng rng_core ip_tables x_tables ipv6
[   19.839848] panel-simple panel_lvds: supply power not found, using dummy regulator
[   19.882062] WARNING: CPU: 1 PID: 189 at drivers/gpu/drm/panel/panel-simple.c:519 panel_simple_parse_panel_timing_node+0x1e4/0x1fc [panel_simple]
[   19.895075] Modules linked in: panel_simple(+) phy_can_transceiver k3_j72xx_bandgap dwc3_am62 rtc_ti_k3 tidss ti_k3_r5_remoteproc rti_wdt(+) drm_dma_helper drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops j721e_csi2rx m_can_platform m_can videobuf2_dma_contig drm can_dev videobuf2_memops videobuf2_v4l2 ti_k3_m4_remoteproc ti_k3_common videobuf2_common sa2ul v4l2_async drm_panel_orientation_quirks mcrc pruss snd_soc_davinci_mcasp snd_soc_ti_udma videodev snd_soc_ti_edma snd_soc_ti_sdma mc cdns_dphy_rx snd_soc_tlv320aic3x_i2c snd_soc_tlv320aic3x optee_rng rng_core ip_tables x_tables ipv6
[   19.976065] pc : panel_simple_parse_panel_timing_node+0x1e4/0x1fc [panel_simple]
[   19.983495] lr : panel_simple_probe+0x2b8/0x3b0 [panel_simple]
[   20.066315]  panel_simple_parse_panel_timing_node+0x1e4/0x1fc [panel_simple]
[   20.073371]  panel_simple_probe+0x2b8/0x3b0 [panel_simple]
[   20.078865]  panel_simple_platform_probe+0x34/0x4c [panel_simple]
[   20.124275]  panel_simple_init+0x30/0x1000 [panel_simple]
[   20.296907] panel-simple panel_lvds: Reject override mode: panel has a fixed mode
root@sbc7138:~# 

I have revised it now ‘ compatible = "panel-lvds"; ’

The LVDS driver has been changed to panel_lvds.ko, and the backlight brightness can now be controlled by command.

However, LVDS still has no output, and neither has CLK

log：

[   24.156417] broken atomic modeset userspace detected, disabling atomic
root@sbc7138:~# [   25.529282] broken atomic modeset userspace detected, disabling atomic

root@sbc7138:~# lsmod | grep panel
panel_lvds             16384  0
drm                   561152  5 drm_kms_helper,drm_dma_helper,tidss,panel_lvds
drm_panel_orientation_quirks    28672  1 drm
root@sbc7138:~# 
root@sbc7138:~# dmesg | grep panel
[   10.464298] platform 30200000.dss: Fixed dependency cycle(s) with /panel_lvds
[   10.471654] platform panel_lvds: Fixed dependency cycle(s) with /bus@f0000/dss@30200000
[   19.150838] Modules linked in: k3_j72xx_bandgap(+) ti_k3_r5_remoteproc(+) dwc3_am62(+) rtc_ti_k3(+) rti_wdt(+) tidss drm_dma_helper j721e_csi2rx videobuf2_dma_contig drm_kms_helper m_can_platform m_can videobuf2_memops syscopyarea sysfillrect videobuf2_v4l2 sysimgblt videobuf2_common fb_sys_fops v4l2_async ti_k3_m4_remoteproc ti_k3_common can_dev videodev drm snd_soc_davinci_mcasp mcrc snd_soc_ti_udma sa2ul drm_panel_orientation_quirks cdns_dphy_rx snd_soc_ti_edma mc pruss snd_soc_ti_sdma snd_soc_tlv320aic3x_i2c snd_soc_tlv320aic3x optee_rng rng_core ip_tables x_tables ipv6
root@sbc7138:~# 
root@sbc7138:~# echo "LVDS-1: 1280x720@60" > /sys/kernel/debug/dri/0/force_connector
-bash: /sys/kernel/debug/dri/0/force_connector: limited authority
root@sbc7138:~# 
root@sbc7138:~# cat /sys/kernel/debug/dri/0/LVDS-1/status
cat: /sys/kernel/debug/dri/0/LVDS-1/status: There is no such file or directory
root@sbc7138:~# 
root@sbc7138:~# ls /sys/kernel/debug/dri/0/LVDS-1/
edid_override  force  output_bpc  vrr_range
root@sbc7138:~# 
root@sbc7138:~# cat /sys/class/backlight/backlight-lvds/max_brightness
255
root@sbc7138:~# cat /sys/class/backlight/backlight-lvds/brightness
255
root@sbc7138:~# 
root@sbc7138:~# echo 128 > /sys/class/backlight/backlight-lvds/brightness
root@sbc7138:~# 
root@sbc7138:~# echo 1 > /sys/class/backlight/backlight-lvds/brightness
root@sbc7138:~# 
root@sbc7138:~# echo 255 > /sys/class/backlight/backlight-lvds/brightness
root@sbc7138:~# 
root@sbc7138:~# ls /sys/kernel/debug/dri/0/LVDS-1/
edid_override  force  output_bpc  vrr_range

Since now you are trying to configure LVDS, I will ask you the same questions again:

Which SDK are you using?
Can you please take reference from this example in the SDK: https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/arch/arm64/boot/dts/ti/k3-am625-sk-microtips-mf101hie-panel.dtso?h=ti-linux-6.12.y and create you dts this way, with panel timings defined in panel-simple.c or equivalent.

Are you using single-link or dual-link LVDS?
Is it a custom board?
Also share results of the following:

kmsprint
modetest -M tidss
kmstest

When you run kmstest, also share what you see on screen.

* OK，The version of SDK I'm using is : ti-processor-sdk-linux-am62xx-evm-09.02.01.10-Linux-x86-Install.bin

* Yes，it's a custom board.

* I'm using single-link LVDS.

* I run the kmstest tool but didn't find it. I think it should be because I rebuilt a Debian system myself. Can these tools be found in the SDK? I didn't find them.

rxw@PowerEdge-T440:~/sbc7138/board-support$ 
rxw@PowerEdge-T440:~/sbc7138/board-support$ find -name kmsprint
rxw@PowerEdge-T440:~/sbc7138/board-support$ 
rxw@PowerEdge-T440:~/sbc7138/board-support$ find -name kmstest
rxw@PowerEdge-T440:~/sbc7138/board-support$ 
rxw@PowerEdge-T440:~/sbc7138/board-support$ find -name modetest
rxw@PowerEdge-T440:~/sbc7138/board-support$ 

root@sbc7138:~# kmsprint
-bash: kmsprint：Command Not found
root@sbc7138:~# 
root@sbc7138:~# modetest -M tidss
-bash: modetest：Command Not found
root@sbc7138:~# 
root@sbc7138:~# kmstest
-bash: kmstest：Command Not found
root@sbc7138:~# 
root@sbc7138:~# lsmod | grep km
drm_kms_helper        184320  4 drm_dma_helper,tidss
syscopyarea            16384  1 drm_kms_helper
sysfillrect            16384  1 drm_kms_helper
sysimgblt              16384  1 drm_kms_helper
fb_sys_fops            16384  1 drm_kms_helper
drm                   561152  5 drm_kms_helper,drm_dma_helper,tidss,panel_lvds
root@sbc7138:~# 

I attempt to refer to: git.ti.com/.../k3-am625-sk-microtips-mf101hie-pane L.tso?h=ti-linux-6.12.y, but there is a compilation exception. It does not have oldi0 and oldi1

Here is my latest log. According to the log, LVDS has been initialized normally. Currently, CLK and data signals have been measured, but they still haven't been displayed.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
[   24.425543] broken atomic modeset userspace detected, disabling atomic
root@sbc7138:~# [   25.951321] broken atomic modeset userspace detected, disabling atomic

root@sbc7138:~# 
root@sbc7138:~# dmesg | grep lvds
[   10.464313] platform 30200000.dss: Fixed dependency cycle(s) with /panel_lvds
[   10.471669] platform panel_lvds: Fixed dependency cycle(s) with /bus@f0000/dss@30200000
root@sbc7138:~# 
root@sbc7138:~# dmesg | grep panel
[   10.464313] platform 30200000.dss: Fixed dependency cycle(s) with /panel_lvds
[   10.471669] platform panel_lvds: Fixed dependency cycle(s) with /bus@f0000/dss@30200000
[   19.051048] Modules linked in: k3_j72xx_bandgap(+) rtc_ti_k3(+) rti_wdt(+) tidss ti_k3_m4_remoteproc(+) can_dev drm_dma_helper j721e_csi2rx drm_kms_helper videobuf2_dma_contig syscopyarea ti_k3_common videobuf2_memops videobuf2_v4l2 sysfillrect videobuf2_common sysimgblt v4l2_async fb_sys_fops mcrc snd_soc_davinci_mcasp drm videodev sa2ul snd_soc_ti_udma drm_panel_orientation_quirks cdns_dphy_rx snd_soc_ti_edma snd_soc_ti_sdma pruss mc snd_soc_tlv320aic3x_i2c snd_soc_tlv320aic3x optee_rng rng_core ip_tables x_tables ipv6
root@sbc7138:~# 
root@sbc7138:~# dmesg | grep drm
[   19.051048] Modules linked in: k3_j72xx_bandgap(+) rtc_ti_k3(+) rti_wdt(+) tidss ti_k3_m4_remoteproc(+) can_dev drm_dma_helper j721e_csi2rx drm_kms_helper videobuf2_dma_contig syscopyarea ti_k3_common videobuf2_memops videobuf2_v4l2 sysfillrect videobuf2_common sysimgblt v4l2_async fb_sys_fops mcrc snd_soc_davinci_mcasp drm videodev sa2ul snd_soc_ti_udma drm_panel_orientation_quirks cdns_dphy_rx snd_soc_ti_edma snd_soc_ti_sdma pruss mc snd_soc_tlv320aic3x_i2c snd_soc_tlv320aic3x optee_rng rng_core ip_tables x_tables ipv6
[   19.897052] [drm] Initialized tidss 1.0.0 20180215 for 30200000.dss on minor 0
[   19.951426] tidss 30200000.dss: [drm] fb0: tidssdrmfb frame buffer device
root@sbc7138:~# 
root@sbc7138:~# dmesg | grep dss
[   10.464313] platform 30200000.dss: Fixed dependency cycle(s) with /panel_lvds
[   10.471669] platform panel_lvds: Fixed dependency cycle(s) with /bus@f0000/dss@30200000
[   19.051048] Modules linked in: k3_j72xx_bandgap(+) rtc_ti_k3(+) rti_wdt(+) tidss ti_k3_m4_remoteproc(+) can_dev drm_dma_helper j721e_csi2rx drm_kms_helper videobuf2_dma_contig syscopyarea ti_k3_common videobuf2_memops videobuf2_v4l2 sysfillrect videobuf2_common sysimgblt v4l2_async fb_sys_fops mcrc snd_soc_davinci_mcasp drm videodev sa2ul snd_soc_ti_udma drm_panel_orientation_quirks cdns_dphy_rx snd_soc_ti_edma snd_soc_ti_sdma pruss mc snd_soc_tlv320aic3x_i2c snd_soc_tlv320aic3x optee_rng rng_core ip_tables x_tables ipv6
[   19.897052] [drm] Initialized tidss 1.0.0 20180215 for 30200000.dss on minor 0
[   19.951426] tidss 30200000.dss: [drm] fb0: tidssdrmfb frame buffer device
root@sbc7138:~# 
root@sbc7138:~# ls /sys/kernel/debug/dri/0
clients  crtc-0  framebuffer  gem_names  internal_clients  LVDS-1  name  state
root@sbc7138:~# 
root@sbc7138:~# cat /sys/kernel/debug/dri/0/state
plane[31]: plane-0
        crtc=crtc-0
        fb=48
                allocated by = [fbcon]
                refcount=2
                format=XR24 little-endian (0x34325258)
                modifier=0x0
                size=1280x800
                layers:
                        size[0]=1280x800
                        pitch[0]=5120
                        offset[0]=0
                        obj[0]:
                                name=0
                                refcount=3
                                start=00100000
                                size=4096000
                                imported=no
                                dma_addr=0x00000000f8200000
                                vaddr=0000000016a01b1d
        crtc-pos=1280x800+0+0
        src-pos=1280.000000x800.000000+0.000000+0.000000
        rotation=1
        normalized-zpos=0
        color-encoding=ITU-R BT.601 YCbCr
        color-range=YCbCr full range
plane[41]: plane-1
        crtc=(null)
        fb=0
        crtc-pos=0x0+0+0
        src-pos=0.000000x0.000000+0.000000+0.000000
        rotation=1
        normalized-zpos=1
        color-encoding=ITU-R BT.601 YCbCr
        color-range=YCbCr full range
crtc[38]: crtc-0
        enable=1
        active=1
        self_refresh_active=0
        planes_changed=1
        mode_changed=0
        active_changed=0
        connectors_changed=0
        color_mgmt_changed=0
        plane_mask=1
        connector_mask=1
        encoder_mask=1
        mode: "1280x800": 59 71100 1280 1350 1354 1442 800 815 819 840 0x48 0xa
connector[40]: LVDS-1
        crtc=crtc-0
        self_refresh_aware=0
        max_requested_bpc=0
root@sbc7138:~# 
root@sbc7138:~# 
root@sbc7138:~# ls /sys/kernel/debug/dri/0/LVDS-1/
edid_override  force  output_bpc  vrr_range
root@sbc7138:~# 
root@sbc7138:~# cat /sys/kernel/debug/dri/0/LVDS-1/force
unspecified
root@sbc7138:~# 
root@sbc7138:~# echo on > /sys/kernel/debug/dri/0/LVDS-1/force
root@sbc7138:~# 
root@sbc7138:~# cat /sys/kernel/debug/dri/0/LVDS-1/force
on
root@sbc7138:~# 

Use the modetest binary from here: https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/latest/exports/docs/linux/How_to_Guides/Target/How_to_boot_quickly.html#additional-notes 

Hi,

Please use this "modetest" download button given at the link:


Not sure from you comments, is your issue resolved?