DS90UB941AS-Q1: No display issue[mobiledrivetech.com]

YT Tso

Intellectual 2090 points

Part Number: DS90UB941AS-Q1

Hello,

Customer just build up the PCB but one panel no display

They want to know if any setting missing?

Thanks YT

HW Change:

SOC pass video via one DSI PORT, total resolution 3840X720@40 FPS. Each display resolution is 1920X720.
Dout0(L) slave address for 0x2C, Dout1(R) set slave address for 0x2E
Serializer(941) mode set to splitter and 4 lanes

SW Change

Setup LEFT_RIGHT_3D “1”
IMG_LINE_SIZE=0x80, IMG_LINE_SIZE1=0x7
IMG_DELAY Keep default

Result:

Dout0(L) display output normal, Dout1(R) display can’t show anything, and Dout1(R) LOCK LED flash(LOCK FAIL)

over 4 years ago

0 Michael.Walker over 4 years ago

TI__Mastermind 19720 points

Hi,

to better debug your system, can you provide me your bring up script and can you provide me with a reg dump of the 948 that is not working? Can you run a BIST test on the port 1 948 to ensure that the link is properly working between the 941 and the 948?

Regards,

Michael W.

0 YT Tso over 4 years ago in reply to Michael.Walker

TI__Intellectual 2090 points

Hi Michael,

Here is feedback

I get another displays for this dual display experiments. The new experiment summary as below

Condition

Two pieces display resolution 1280X800
SOC DSI output

timings.width = 1280*2U;

timings.height = 800U;

timings.hFrontPorch = 60*2U;

timings.hBackPorch = 40*2U;

timings.hSyncLen = 28*2U;

timings.vFrontPorch = 8U;

timings.vBackPorch = 5U;

timings.vSyncLen = 3U;

timings.pixelClock = 68935680*2ULL

Ds90ub941 setting

Serializer init

DeSerializer init

/* Seg ADDR DAT */

{0x00, 0x01, 0x08},

{0x00, 0x1E, 0x01},

{0x00, 0x03, 0x9A},

/* Enable Left/Right 3D processing */

{0x00, 0x5B, 0x07},

{0x00, 0x56, 0x80},

// Here is 1280 as defaul

{0x00, 0x32, 0x00},

{0x00, 0x33, 0x05},

{0x00, 0xc6, 0x21},

/*Crop Port0 1280X800 image*/

{0x00, 0x1E, 0x01},

{0x00, 0x36, 0x00},

{0x00, 0x37, 0x80},

{0x00, 0x38, 0xFF},

{0x00, 0x39, 0x04},

{0x00, 0x3A, 0x00},

{0x00, 0x3B, 0x00},

{0x00, 0x3C, 0x1F},

{0x00, 0x3D, 0x03},

/*Crop Port1 1280X800 image*/

{0x00, 0x1E, 0x02},

{0x00, 0x36, 0x00},

{0x00, 0x37, 0x80},

{0x00, 0x38, 0xFF},

{0x00, 0x39, 0x04},

{0x00, 0x3A, 0x00},

{0x00, 0x3B, 0x00},

{0x00, 0x3C, 0x1F},

{0x00, 0x3D, 0x03},

{0x00, 0x1E, 0x01},

{0x00, 0x40, 0x04},

{0x00, 0x41, 0x21},

{0x00, 0x42, 0x60},

{0x00, 0x4F, 0x8C},

/*configure TSKIP_CN*/

{0x00, 0x1E, 0x01},

{0x00, 0x40, 0x04},

{0x00, 0x41, 0x05},

{0x00, 0x42, 0x2C},

{0x00, 0x0E, 0x33},

{0x00, 0x0F, 0x03},

{0x00, 0x10, 0x33},

{0x00, 0x01, 0x00},

{0xFF, 0xC8, 0x00},

/* Seg ADDR DAT */

{0x00, 0x01, 0x07},

//delay 200ms

{0xFF, 0xC8, 0x00},

{0x00, 0x01, 0x00},

{0x00, 0x1D, 0x05},

{0x00, 0x1F, 0x05},

{0x00, 0x20, 0x11},

// {0xFF, 0x64, 0x00},

// {0x00, 0x20, 0x10},

{0xFF, 0x0A, 0x00},

{0x00, 0x20, 0x09},

{0xFF, 0x14, 0x00},

{0x00, 0x20, 0x99},

{0x00, 0x1E, 0x55},

{0x00, 0x49, 0x62},

Bridge IC register dump

Serializer

DeSerializer

spm8666p1_64_bsp:/ # i2cdump -f -y 0 0xc

No size specified (using byte-data access)

0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef

00: 18 00 00 9a 00 00 58 00 00 01 12 00 67 30 33 03 ?..?..X..??.g03?

10: 33 00 00 ff 00 00 fe 1e 7f 7f 01 00 66 00 01 00 3.....?????.f.?.

20: 0b 00 25 00 00 00 00 00 01 20 20 a0 00 00 a5 5a ?.%.....? ?..?Z

30: 00 09 00 05 0c 00 00 80 ff 04 00 00 1f 03 81 02 .?.??..?.?..????

40: 04 05 2c 00 00 00 00 00 00 00 00 00 00 00 00 8c ??.............?

50: 16 00 00 00 02 10 80 02 00 00 d9 07 07 06 44 46 ?...????..????DF

60: 22 02 00 00 10 00 00 00 00 00 00 00 00 00 20 00 "?..?......... .

70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 7e 00 ..............~.

80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

c0: 00 00 82 00 78 00 21 44 40 00 00 00 00 02 ff 00 ..?.x.!D@....?..

d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

e0: 00 00 82 00 68 08 21 00 00 00 00 00 00 02 00 00 ..?.h?!......?..

f0: 5f 55 42 39 34 31 00 00 00 00 00 00 00 00 00 00 _UB941..........

spm8666p1_64_bsp:/ # i2cdump -f -y 0 0x2c

No size specified (using byte-data access)

0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef

00: 58 04 00 f0 fe 1e 00 18 00 00 00 00 00 00 00 00 X?.???.?........

10: 00 00 00 00 00 00 00 00 00 01 00 00 03 15 55 05 .........?..??U?

20: 99 00 40 20 08 00 83 84 01 00 00 00 00 00 00 00 ?.@ ?.???.......

30: 00 00 90 25 01 00 00 8e 00 00 00 00 20 e0 23 00 ..?%?..?.... ?#.

40: 43 03 03 00 60 88 00 00 0f e2 00 08 00 00 63 00 C??.`?..??.?..c.

50: 03 10 00 01 80 00 00 00 00 7f 20 20 00 00 00 00 ??.??....? ....

60: 00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00 ....?...........

70: 00 00 00 07 07 08 00 00 00 00 00 00 02 00 00 00 ...???......?...

80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

a0: 00 00 8c 00 00 00 00 00 00 00 00 00 00 00 00 00 ..?.............

b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

c0: 00 00 00 00 00 00 00 00 c0 00 00 00 00 00 00 00 ........?.......

d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................

f0: 5f 55 42 39 34 38 00 00 00 00 00 00 00 00 00 00 _UB948..........

Result:

Dout0 we can access DeSerializer by kernel driver but display can’t show anything.
Dout1 display LOCK flash issue reduce, the status better than 1920X720 case
Dout1 I2C still can’t access bridge IC slave address

0 Michael.Walker over 4 years ago in reply to YT Tso

TI__Mastermind 19720 points

Hi,

It seems that your 941As is strapped into the incorrect mode what is the MOSE_SEL0,1 set to on the 941AS?

Regards,

Michael W.

0 YT Tso over 4 years ago in reply to Michael.Walker

TI__Intellectual 2090 points

Hi Michael,

For MOSE_SEL0,1 shall we use hardware pin set first or we can set by software later?

Thanks YT

0 Michael.Walker over 4 years ago in reply to YT Tso

TI__Mastermind 19720 points

You should set them to the correct mode in hardware first.

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DS90UB941AS-Q1: No display issue[mobiledrivetech.com]