VGA Interface for DRA7xx

Hi Ganesh,
I think, you may need to enable the LCD controller support with VGA panel configuration (resolution, timing parameters etc.,)

Hello Ganesh,

Please try to enable VGA support by menuconfig:
processors.wiki.ti.com/.../Linux_Core_DSS_User's_Guide

For ex: To set 640 * 480 VGA resolution.
echo " 25175,640/16/48/96,480/11/31/2" > /sys/devices/platform/omapdss/display1/timings

Best regards,
Yanko

Hi Yanko,

            In the user guide no where mentioned for VGA encoders, and i am also having a provision for LVDS on the same LCD Bus. Same issue with LVDS also.

To do this
|-----------------------------------------------------------------------------------------------------------------------------------------------------
For ex: To set 640 * 480 VGA resolution.
echo " 25175,640/16/48/96,480/11/31/2" > /sys/devices/platform/omapdss/display1/timings
------------------------------------------------------------------------------------------------------------------------------------------------|

root@dra7xx-evm:~# ls /sys/devices/platform/omapdss/
driver      modalias         power          subsystem          uevent

I am not getting any directory with display. In kernel make menuconfig where to enable VGA support for LCD exactly?

Also i tried changing the display node to hdmi in dra7xx-evm-lcd10.dts also for getting any signals to VGA.
aliases {
display0 = &hdmi0;
display1 = &tlc59108;
};
};


Thanks & Regards,
Ganesh

Hello Ganesh,

I tried to set VGA as executed following steps:

root@dra7xx-evm:~# modetest

:

trying to load module omapdrm...success.

Encoders:

id crtc type possible crtcs possible clones

3 10 TMDS 0x00000001 0x00000000

15 0 TMDS 0x00000002 0x00000000

Connectors:

id encoder status type size (mm) modes encoders

4 3 connected unknown 0x0 1 3

 modes:

name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot)

 1280x800 60 1280 1328 1360 1404 800 804 811 823 flags: nhsync, nvsync; type: preferred, driver

 props:

1 EDID:

flags: immutable blob

blobs:

value: 2 DPMS:

flags: enum

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

value: 0

16 0 disconnected HDMI-A 0x0 0 15

CRTCs:

id fb pos size

10 23 (0,0) (1280x800)

 1280x800 60 1280 1328 1360 1404 800 804 811 823 flags: nhsync, nvsync; type: preferred, driver

 props:

11 trans-key-mode:

flags: enum

enums: disable=0 gfx-dst=1 vid-src=2

value: 0

12 trans-key:

flags: range

values: 0 16777215

value: 0

13 background:

flags: range

values: 0 16777215

value: 0

14 alpha_blender:

flags: enum

enums: disable=0 enable=1

value: 0

6 rotation:

flags: bitmask

values: rotate-0=0x1 rotate-90=0x2 rotate-180=0x4 rotate-270=0x8 reflect-x=0x10 reflect-y=0x20

value: 0

7 zorder:

flags: range

values: 0 3

value: 0

8 global_alpha:

flags: range

values: 0 255

value: 0

9 pre_mult_alpha:

flags: enum

enums: disable=0 enable=1

value: 0

18 0 (0,0) (0x0)

  0 0 0 0 0 0 0 0 0 flags: ; type:

 props:

11 trans-key-mode:

flags: enum

enums: disable=0 gfx-dst=1 vid-src=2

value: 0

12 trans-key:

flags: range

values: 0 16777215

value: 0

13 background:

flags: range

values: 0 16777215

value: 0

14 alpha_blender:

flags: enum

enums: disable=0 enable=1

value: 0

6 rotation:

flags: bitmask

values: rotate-0=0x1 rotate-90=0x2 rotate-180=0x4 rotate-270=0x8 reflect-x=0x10 reflect-y=0x20

value: 0

7 zorder:

flags: range

values: 0 3

value: 0

8 global_alpha:

flags: range

values: 0 255

value: 0

9 pre_mult_alpha:

flags: enum

enums: disable=0 enable=1

value: 0

Planes:

id crtc fb CRTC x,y x,y gamma size

19 0 0 0,0 0,0 0

 formats: RG16 RX12 XR12 RA12 AR12 XR15 AR15 RG24 RX24 XR24 RA24 AR24 NV12 YUYV UYVY

 props:

6 rotation:

flags: bitmask

values: rotate-0=0x1 rotate-90=0x2 rotate-180=0x4 rotate-270=0x8 reflect-x=0x10 reflect-y=0x20

value: 0

7 zorder:

flags: range

values: 0 3

value: 0

8 global_alpha:

flags: range

values: 0 255

value: 0

9 pre_mult_alpha:

flags: enum

enums: disable=0 enable=1

value: 0

20 0 0 0,0 0,0 0

 formats: RG16 RX12 XR12 RA12 AR12 XR15 AR15 RG24 RX24 XR24 RA24 AR24 NV12 YUYV UYVY

 props:

6 rotation:

flags: bitmask

values: rotate-0=0x1 rotate-90=0x2 rotate-180=0x4 rotate-270=0x8 reflect-x=0x10 reflect-y=0x20

value: 0

7 zorder:

flags: range

values: 0 3

value: 0

8 global_alpha:

flags: range

values: 0 255

value: 0

9 pre_mult_alpha:

flags: enum

enums: disable=0 enable=1

value: 0

Frame buffers:

id size pitch

root@dra7xx-evm:~# modetest -s 4:640x480

setting mode 640x480@XR24 on connector 4, crtc 10

Run the command: root@dra7xx-evm:~# modetest -s <connector ID>:640x480 

Best regards,

Yanko