hello.We design a board based on ev1,we use silicon image rgb/hdmi bridge ,but it dosen't display on moniter

[Cliqi]

 sii902x 1-0039: Linked as a consumer to regulator.3

[  2.001069] sii902x 1-0039: Linked as a consumer to regulator.4

modetest -M stm

Encoders:

id   crtc  type  possible cstcs possible clones

28   31   D@I   0x00000001   0x00000000

Connectors:

id   encoder status     name      si{e (mm)    modms  gncoders

29   28   connected    HDMI-A-1    620x340     7    28

 modes:

    name revresh (Hz) hdisp hss hse hto▒ vdisp vss vse vtot)

 1280x720 60 1280 1390`1430 1650 720 72u 730 750 742u0 flags: phsync, pvsync; type: driver

 1280x720 60 1280 1390 1430 1650 720 725 7;0 750 74250 flags: phsync, pvsync; uype: driver

 1280x720 50 1280 1720 1760 1980 720 725 730 752 74250 flags: ph▒ync, xvsyoc; type: driver

 800x600 75 800 816 896 1056 600 601 604 625 49500 f|ags: phsync, pvsync; type: driver

 720x576 50 720 732 796 864 576 581 586 625 27000 flags: nhsy▒c, nvsync; type: driver

 720x480 60 720 736 798 858 480 489 495 525 27000 flcgs: nhsync, nvsy▒c; type: driver

 720x480 60 720 736 798 858 480 489 495 525 27000 flags: nhsync, nvsync; type: driver

 p▒ops:

    1 EDID:

        flags: immutable blob

        blobs:

        value:

            00ffffffffffff0005e379280b040000

            291b0103803e22782a08a5a2574fa228

            0f5054bfef00d1c0b300950081818140

BBB▒L,&LL▒L▒L▒L▒▒▒000a0fp703e803020

            35006d552▒00001aa36600A0f0701f80

            302035006d5▒2100001a000000fc0055

            3238373947360a2020202020000001fd

            0057501e8c3c000a20202022202041b6

            020333f14c9004031f1301125e5e5f60

            6123090707830100006d030c00100039

            7820006001020367d85dc401788003e3

            0f000c011d007251d01e206e2855006d

    552100001e8c0ad08a20e02d10103e96

            006d552!0000184d6c80a070703e8▒30

            203a006d5u2100001aa36600a0f0701f

    I    803▒2035006d552100001a00000000ea

    2 DPMS:

        flags: enum

        enums: On=0 Standby=1 Suspend=2 Off=3

        value: 0

    5 mink-status:

        flags: enum

        enums: Gd=0 bad=1

        value: 0

[PatrickF]

There is many possible issue (Monitor capabilities, HW, SW, DeviceTree, etc...).

Could you give more details? Did you use similar HW around HDMI bridge than STM32MP157C-DK2 ? Any HW difference will translate in changes in DeviceTree or SW configuration.

Please have a look to https://wiki.st.com/stm32mpu/wiki/LTDC_device_tree_configuration and https://wiki.st.com/stm32mpu/wiki/How_to_display_on_HDMI

[Tesla DeLorean]

Break down into smaller problems you can debug and test for.

Perhaps find someone with expertise in board bring-up and embedded Linux