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DS90UB941AS-Q1: Setup ds90ub941 as single DSI input and two FPD-LINK outputs to two display

Abbott Chung
Prodigy 10 points
Part Number: DS90UB941AS-Q1

Hi Experts,

Our project is using a DS90UB941 via two ds90ub948 splitting two displays as below

We follow snla308a.pdf set up DS90ub941 but both panel can't normal display anything.

Below are summary and some information about Setting

  1. Both of panel can't show anything,
  2. Dout0 we can access DeSerializer but Dout1 can't access DeSerializer by i2c.
  3. Could you help us checking do we have others setting have lose make both of panel can't normal display screen and Dout1 also can't access bt i2c? 

Input/Out video data

# 2560x800@60 Symmetric Split Example - 2x 12800x800@60

# Video 0 and Video 1 Parameters:
# HACT = 1280
# HFP = 60
# HSYNC = 28
# HBP = 40
# VACT = 800
# VFP = 8
# VSYNC = 3
# VBP = 5
# PCLK = 68935680 

# DSI Dimensions:
# HACT = 2560
# HFP = 120
# HSYNC = 56
# HBP = 80
# VACT = 800
# VFP = 8
# VSYNC = 3
# VBP = 5
# PCLK = 137871360

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

 /* ADDR    DAT */

    { 0x01, 0x08},
    { 0x1E, 0x01},
    { 0x03, 0x9A},
    /* Enable Left/Right 3D processing */
    { 0x5B, 0x07},
    { 0x56, 0x80},
    /* Here is 1280 as defaul*/
    { 0x32, 0x00},
    { 0x33, 0x05},
	/*Set up INTB*/
    { 0xc6, 0x21},

/*Crop Port0 1280X800 image*/
    { 0x1E, 0x01},
    { 0x36, 0x00},
    { 0x37, 0x80},
    { 0x38, 0xFF},
    { 0x39, 0x04},
    { 0x3A, 0x00},
    { 0x3B, 0x00},
    { 0x3C, 0x1F},
    { 0x3D, 0x03},

/*Crop Port1 1280X800 image*/
    { 0x1E, 0x02},
    { 0x36, 0x00},
    { 0x37, 0x80},
    { 0x38, 0xFF},
    { 0x39, 0x04},
    { 0x3A, 0x00},
    { 0x3B, 0x00},
    { 0x3C, 0x1F},
    { 0x3D, 0x03},

 /*Set DSI0 DSI_VS_POLARITY=DSI_HS_POLARITY=1*/
    { 0x1E, 0x01},
    { 0x40, 0x04},
    { 0x41, 0x21},
    { 0x42, 0x60},
    { 0x4F, 0x8C},

/*configure TSKIP_CN*/
    { 0x1E, 0x01},
    { 0x40, 0x04},
    { 0x41, 0x05},
    { 0x42, 0x2C},

 /*GPIO Setting*/
    { 0x0E, 0x33},
    { 0x0F, 0x03},
    { 0x10, 0x33},
 /*Enable DSI*/
    { 0x01, 0x00},

Ds90ub941 register dump

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..........

Looking forward to your reply. Thank you very much.

Best regards,

Abbott Chung

  • 0
    TI__Mastermind 25735 points

    Hi Abbot,

    In your script, please add the following lines of code before reenabling DSI as recommended in the datasheet to initialize DSI:

    board.WriteI2C(UB941AS,0x40,0x10) # Init DSI Clock Settings (From Section 10.2 of datasheet)
    board.WriteI2C(UB941AS,0x41,0x86) # Init DSI Clock Settings (From Section 10.2 of datasheet)
    board.WriteI2C(UB941AS,0x42,0x0A) # Init DSI Clock Settings (From Section 10.2 of datasheet)
    board.WriteI2C(UB941AS,0x41,0x94) # Init DSI Clock Settings (From Section 10.2 of datasheet)
    board.WriteI2C(UB941AS,0x42,0x0A) # Init DSI Clock Settings (From Section 10.2 of datasheet)

    Can you also read DSI_ERR_CFG_1 Register (0x23) from both port 0 and port 1 indirect registers?

    Regards,

    Ben Dattilo

  • 0
    Prodigy 10 points

    Hi Ben.

    I have add the those setting at initial code, but still can't see the content at display.

    Below are dump from DSI_ERR_CFG_1 port0 & port1

    spm8666p1_64_bsp:/ # i2cset -f -y 0 0x0c 0x40 0x5
spm8666p1_64_bsp:/ # i2cset -f -y 0 0x0c 0x41 0x23
spm8666p1_64_bsp:/ # i2cget -f -y 0 0x0c 0x42
0x7f
spm8666p1_64_bsp:/ # i2cset -f -y 0 0x0c 0x40 0x9
spm8666p1_64_bsp:/ # i2cset -f -y 0 0x0c 0x41 0x23
spm8666p1_64_bsp:/ # i2cget -f -y 0 0x0c 0x42
0x7f
     

    I also dump DSI port0 & port1 register information as below

    *********DSI0 REG*********
0x01: 0x00
0x02: 0x00
0x03: 0x1d
0x04: 0x14
0x05: 0x2c
0x06: 0x00
0x07: 0x00
0x08: 0x00
0x0F: 0x3f
0x10: 0x16
0x11: 0x16
0x12: 0x16
0x13: 0x12
0x14: 0x04
0x15: 0x00
0x20: 0x7f
0x21: 0x60
0x22: 0xff
0x23: 0x7f
0x28: 0x05
0x29: 0xff
0x2A: 0x3e
0x2B: 0x8d
0x2C: 0x06
0x2D: 0x02
0x30: 0x00
0x31: 0x20
0x32: 0x00
0x33: 0x04
0x34: 0x00
0x35: 0x20
0x36: 0x00
0x37: 0x00
0x38: 0x00
0x3A: 0x02
0x3B: 0x03
*********DSI1 REG*********
0x01: 0x00
0x02: 0x00
0x03: 0x1d
0x04: 0x14
0x05: 0x3a
0x06: 0x00
0x07: 0x00
0x08: 0x00
0x0F: 0x10
0x10: 0x00
0x11: 0x00
0x12: 0x00
0x13: 0x00
0x14: 0x00
0x15: 0x00
0x20: 0x7f
0x21: 0x00
0x22: 0xff
0x23: 0x7f
0x28: 0x00
0x29: 0x00
0x2A: 0x00
0x2B: 0x00
0x2C: 0x00
0x2D: 0x00
0x30: 0x00
0x31: 0x20
0x32: 0x00
0x33: 0x04
0x34: 0x00
0x35: 0x20
0x36: 0x00
0x37: 0x00
0x38: 0x00
0x3A: 0x02
0x3B: 0x03

    Could you help checking the dsi need to modify or other need to change?

    Best regards,

    Abbott Chung

  • 0 in reply to Abbott Chung
    TI__Mastermind 25735 points

    Hi Abbott,

    I've created a new script with your configuration. It appears port 1 is not configured correctly in your original script, based on what is seen in the DSI registers. Try running this and see if the issue is corrected.

    Superframe_Crop_2560x800.txt 
    																																									
board.WriteI2C(UB941AS,0x01,0x08)		#Disable DSI

#Set HV polarity													
board.WriteI2C(UB941AS, 0x1E, 0x01) 		#Select FPD-Link III Port 0
board.WriteI2C(UB941AS, 0x40, 0x05)		#Select DSI Port 0 digital registers
board.WriteI2C(UB941AS, 0x41, 0x21)		#Select DSI_CONFIG_1 register
board.WriteI2C(UB941AS, 0x42, 0x60) 		#Set DSI_VS_POLARITY=DSI_HS_POLARITY=1
board.WriteI2C(UB941AS, 0x1E, 0x02)		#Select FPD-Link III Port 1
board.WriteI2C(UB941AS, 0x40, 0x09)		#Select DSI Port 1 digital registers
board.WriteI2C(UB941AS, 0x41, 0x21)		#Select DSI_CONFIG_1 register
board.WriteI2C(UB941AS, 0x42, 0x60) 		#Set DSI_VS_POLARITY=DSI_HS_POLARITY=1 
															
# set split mode, left/right 3D image, non-continuous clock mode															
board.WriteI2C(UB941AS, 0x1E, 0x01)		#Select Port0													
board.WriteI2C(UB941AS, 0x5B, 0x07)		#Force Splitter Mode													
board.WriteI2C(UB941AS, 0x56, 0x80)		#Enable conversion of L/R image into alternating pixel image													
board.WriteI2C(UB941AS, 0x4F, 0x8C)		#Set 4 lane DSI		
											
##### Register 4F code configuration limited to use case of single DSI mode (RX Port 0) and no Altnerate line mode. If you would like to change the mode, please see register 0x4F [6:4]  in D/S															
board.WriteI2C(UB941AS, 0x1E, 0x02)		#Select Port1													
board.WriteI2C(UB941AS, 0x5B, 0x07)		#Force Splitter Mode													
board.WriteI2C(UB941AS, 0x56, 0x80)		#Enable conversion of L/R image into alternating pixel image													
board.WriteI2C(UB941AS, 0x4F, 0x8C)		#Set 4 lane DSI		
											
##### Register 4F code configuration limited to use case of single DSI mode (RX Port 0) and no Altnerate line mode. If you would like to change the mode, please see register 0x4F [6:4] in D/S															
															
board.WriteI2C(UB941AS, 0x1E, 0x01)		# Select Port0													
															
board.WriteI2C(UB941AS, 0x32, 0x00)		#Set IMG_LINE_SIZE													
board.WriteI2C(UB941AS, 0x33, 0x05)		#Set IMG_LINE_SIZE													
board.WriteI2C(UB941AS, 0x36, 0x00)		#Set crop start X position (LSB)													
board.WriteI2C(UB941AS, 0x37, 0x80)		#Set crop start X position (MSB)													
board.WriteI2C(UB941AS, 0x38, 0xFF)		#Set crop stop X position (LSB)													
board.WriteI2C(UB941AS, 0x39, 0x04)		#Set crop stop X position (MSB)													
board.WriteI2C(UB941AS, 0x3A, 0x00)		#Set crop start Y position (LSB)													
board.WriteI2C(UB941AS, 0x3B, 0x00)		#Set crop start Y position (MSB)													
board.WriteI2C(UB941AS, 0x3C, 0x1F)		#Set crop stop Y position (MSB)													
board.WriteI2C(UB941AS, 0x3D, 0x03)		#Set crop start Y position (LSB)													
															
board.WriteI2C(UB941AS, 0x1E, 0x02)		# Select Port1													
															
board.WriteI2C(UB941AS, 0x36, 0x00)		#Set crop start X position (LSB)													
board.WriteI2C(UB941AS, 0x37, 0x80)		#Set crop start X position (MSB)													
board.WriteI2C(UB941AS, 0x38, 0xFF)		#Set crop stop X position (LSB)													
board.WriteI2C(UB941AS, 0x39, 0x04)		#Set crop stop X position (MSB)													
board.WriteI2C(UB941AS, 0x3A, 0x00)		#Set crop start Y position (LSB)													
board.WriteI2C(UB941AS, 0x3B, 0x00)		#Set crop start Y position (MSB)													
board.WriteI2C(UB941AS, 0x3C, 0x1F)		#Set crop stop Y position (MSB)													
board.WriteI2C(UB941AS, 0x3D, 0x03)		#Set crop start Y position (LSB)													
															
															
board.WriteI2C(UB941AS, 0x1E, 0x01)		# Select Port0													
board.WriteI2C(UB941AS, 0x40, 0x04)		# Select DSI digital page
													
board.WriteI2C(UB941AS, 0x41, 0x05)		# To reg 0x05 (TSKIP CNT)
													
board.WriteI2C(UB941AS, 0x42, 0x2C)		# Set value for DSI+CLK													
board.WriteI2C(UB941AS, 0x40, 0x08)		# Select DSI digital page
													
board.WriteI2C(UB941AS, 0x41, 0x05)		# To reg 0x05 (TSKIP CNT)
												
board.WriteI2C(UB941AS, 0x42, 0x2C)		# Set value for DSI+CLK													
															
															
board.WriteI2C(UB941AS, 0x01, 0x00)		#Enable DSI

    Regards,

    Ben Dattilo

  • 0
    Prodigy 10 points

    Hi Ben,

    After add those setting. I still can't see the screen on display.

    I have dump the latest register as below, could you help checking it.

    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 13 00 67 30 33 03    ?..?..X..??.g03?
10: 33 00 00 ff 00 00 fe 1e 7f 7f 01 00 6e 00 01 00    3.....?????.n.?.
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: 10 94 00 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 7f 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..........

    DSI register dump

    *********DSI0 REG*********
0x01: 0x00
0x02: 0x00
0x03: 0x1d
0x04: 0x14
0x05: 0x2c
0x06: 0x00
0x07: 0x00
0x08: 0x00
0x0F: 0x7f
0x10: 0x06
0x11: 0x06
0x12: 0x06
0x13: 0x18
0x14: 0x04
0x15: 0x08
0x20: 0x7f
0x21: 0x60
0x22: 0xff
0x23: 0x7f
0x28: 0x01
0x29: 0xff
0x2A: 0x3e
0x2B: 0x04
0x2C: 0x07
0x2D: 0x00
0x30: 0x00
0x31: 0x20
0x32: 0x00
0x33: 0x04
0x34: 0x00
0x35: 0x20
0x36: 0x00
0x37: 0x00
0x38: 0x00
0x3A: 0x02
0x3B: 0x03
*********DSI1 REG*********
0x01: 0x00
0x02: 0x00
0x03: 0x1d
0x04: 0x14
0x05: 0x2c
0x06: 0x00
0x07: 0x00
0x08: 0x00
0x0F: 0x10
0x10: 0x00
0x11: 0x00
0x12: 0x00
0x13: 0x00
0x14: 0x00
0x15: 0x00
0x20: 0x7f
0x21: 0x60
0x22: 0xff
0x23: 0x7f
0x28: 0x00
0x29: 0x00
0x2A: 0x00
0x2B: 0x00
0x2C: 0x00
0x2D: 0x00
0x30: 0x00
0x31: 0x20
0x32: 0x00
0x33: 0x04
0x34: 0x00
0x35: 0x20
0x36: 0x00
0x37: 0x00
0x38: 0x00
0x3A: 0x02
0x3B: 0x03

    Best regards,

    Abbott Chung

  • 0 in reply to Abbott Chung
    TI__Mastermind 25735 points

    Hi Abbott,

    • In the 941 datasheet, there are two Power-Up and Initialization sequences described. Are you following Sequence A or Sequence B? Can you provide oscilloscope captures showing the initialization sequence of VDDx, PDB, DSI, PCLK?
    • Can you provide a reg dump of the 948 as well?
    • Your mode select shows the device is in coax mode. Are you using coax cables?

    Regards,

    Ben

  • 0
    Prodigy 10 points

    Hi Ben,

    • After get power on sequence waveform, I will attach to E2E
    • Below is the DeSerializer register dump.

    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..........

    • No, we are not use coax. we use STP

    Best regards,

    Abbott Chung

  • 0 in reply to Abbott Chung
    TI__Mastermind 25735 points

    Hi Abbott,

    If you are using STP, you need to change the MODE_SEL1 on the 941, as it is currently set to coax mode. Table 8-10 in the datasheet shows the Strap Configuration for MODE_SEL1, and register 0x13 shows the status of MODE_SEL0 and MODE_SEL1. The 948 however appears to already be set to STP mode.

    Regards,

    Ben

  • 0 in reply to Ben Dattilo
    Prodigy 10 points

    Hi Ben,

    Our EE have checking the hardware setting. even change to STP mode it still can't see the content.

    reg  0x13  = 0xDF

    BR,

    Abbott

  • 0 in reply to Abbott Chung
    TI__Mastermind 25735 points

    Hi Abbott,

    Have you verified what powerup/initialization sequence is being used? Also, try doing a soft reset towards the end of your script. To do this, write 0x01 to register 0x01. This will reset the entire digital block except the registers.

    Regards,

    Ben