DS90C387A: LVDS Display half screen problem

Hi Mr.Casey, thanks for your response. I have already tried original 1920x1080.S file which has 148,5Mhz frequency but result is same that screen seems half display. Also for be sure I have tried again. Also chips which we used are 

TFP401A-Q1

DS90C387A

24C02 EEPROM (edid)

Hello Berat,

When you plug this display, what does the PC recognize as the display resolution in the monitor properties? Please confirm on the PC side that the display is recognized as a 1080p monitor with 148.5MHz PCLK. You may need to adjust the display settings on the PC side in case there are multiple supported resolutions. 

Please also double confirm the EDID that is generated because when I look at the one from your previous post it is identifying the incorrect PCLK rate in the timing descriptor:

Best Regards,

Casey 

Hi Casey,

I generate again with original 1920x1080@60 edid and burn eeprom. Then we plugged to PC and we have seen same half screen. I attach my last edid, configration file and screenshots of pc's monitor information.

/*
   1920x1080.S: EDID data set for standard 1920x1080 60 Hz monitor

   Copyright (C) 2012 Carsten Emde <C.Emde@osadl.org>

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; either version 2
   of the License, or (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA.
*/

/* EDID */
#define VERSION 1
#define REVISION 3

/* Display */
#define CLOCK 148500 /* kHz */
#define XPIX 1920
#define YPIX 1080
#define XY_RATIO XY_RATIO_16_9
#define XBLANK 280
#define YBLANK 45
#define XOFFSET 88
#define XPULSE 44
#define YOFFSET (63+4)
#define YPULSE (63+5)
#define DPI 96
#define VFREQ 60 /* Hz */
#define TIMING_NAME "Linux FHD"
/* No ESTABLISHED_TIMINGx_BITS */
#define HSYNC_POL 1
#define VSYNC_POL 1

#include "edid.S"

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: 00 ff ff ff ff ff ff 00 31 d8 00 00 00 00 00 00    ........1?......
10: 05 16 01 03 6d 32 1c 78 ea 5e c0 a4 59 4a 98 25    ????m2?x?^??YJ?%
20: 20 50 54 00 00 00 d1 c0 01 01 01 01 01 01 01 01     PT...??????????
30: 01 01 01 01 01 01 02 3a 80 18 71 38 2d 40 58 2c    ???????:??q8-@X,
40: 45 00 f4 19 11 00 00 1e 00 00 00 9f 00 4c 69 6e    E.???..?...?.Lin
50: 75 78 20 23 30 0a 20 20 20 20 00 00 00 fd 00 3b    ux #0?    ...?.;
60: 3d 42 44 0f 00 0a 20 20 20 20 20 20 00 00 00 fc    =BD?.?      ...?
70: 00 4c 69 6e 75 78 20 46 48 44 0a 20 20 20 00 05    .Linux FHD?   .?
80: 02 03 22 71 49 90 20 05 04 03 02 07 06 01 23 09    ??"qI? ???????#?
90: 07 01 83 01 00 00 e3 05 03 01 67 03 0c 00 10 00    ????..????g??.?.
a0: b8 2d 01 1d 80 18 71 1c 16 20 58 2c 25 00 34 cc    ?-????q?? X,%.4?
b0: 31 00 00 9e 01 1d 00 72 51 d0 1e 20 6e 28 55 00    1..???.rQ?? n(U.
c0: 34 cc 31 00 00 1e 8c 0a d0 8a 20 e0 2d 10 10 3e    4?1..????? ?-??>
d0: 96 00 67 cc 21 00 00 18 8c 0a a0 14 51 f0 16 00    ?.g?!..?????Q??.
e0: 26 7c 43 00 67 cc 21 00 00 ff 00 00 00 00 00 00    &|C.g?!.........
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3b    ...............;

Also I want to add more detail about hardware.

We changed configure on TFP401A-Q1 via PIXS pin.

When we set PIXS pin to GND -> we get half screen like before I attached photo.

When we set PIXS pin to HIGH -> we get full screen but with pixel shift. Display not seems good. I attachted pictures below when PIXS pin is HIGH.

Berat,

What mode are you using on the DS90C387A DUAL pin? Make sure PIXS is high on the TFP401A and DUAL is high on the DS90C387A to do DVI -> dual RGB -> dual OLDI which is what you would need for this PCLK rate 

Best Regards,

Casey 

Hi Casey,

I attached our configration section at schematic, Can you check?

Also we check now that PIXS and DUAL are high. We detect 74.5 MHZ at ODCK pin via scope. But our screen seems same as I attached photo before.

Berat,

Do you see 74MHz at both output clocks on the DS90C387A? Are both LVDS channels connected to the panel?

Best Regards,

Casey 

Hi Casey,

Yes the both LVDS channels are connected to panel. We can see 74Mhz at output clocks but clocks are not stable. Sometimes bounce to 68 mhz sometimes we see 80mhz etc. I attached video.