1280x1024@60 HDMI output does not work?

Ben9619

I am trying to output 1280x1024@60Hz from the HDMI port on the DM816x EVM. I changed the mode for hdmi to 1280x1024@60 in the the load-hd-firmware.sh script in the EzSDK and am seeing the correct resolution but the refresh rate (60Hz) appears to be wrong. On some monitors I have tested the video is displayed but the monitor says the refresh rate is 82Hz while other monitors do not display at all and indicate that the signal is not a known compatible signal.

I double checked the timing settings in the sys.h file where the modes are defined and they seem correct. Is there somewhere else that these timings could be incorrectly set? Is it possible it is a bug in the HDMI driver?

Thanks in advance.

over 12 years ago

0 HardikShah over 12 years ago

TI__Mastermind 20245 points

Hi,

Once system boots up you can see the sysfs entry and make sure timings are correct. You need to see

cat /sys/devices/platform/vpss/display0/timings sysfs entry to see current timings

0 Ben9619 over 12 years ago in reply to HardikShah

Intellectual 330 points

I checked the sysfs entry again and the timings appear correct:

108000,1280/48/248/112,1024/1/38/3,1

The monitor still says 82-83Hz though.

0 HardikShah over 12 years ago in reply to Ben9619

TI__Mastermind 20245 points

Hi,

Which psp release you are using. I tried with latest PSP release 04.04.00.02 and monitor says 1280X1024@60.

0 Ben9619 over 12 years ago in reply to HardikShah

Intellectual 330 points

I am on PSP 4.04.00.01. I will try the upgrading to the latest.

0 Ben9619 over 12 years ago in reply to Ben9619

Intellectual 330 points

Can you provide me with a link to PSP 4.04.00.02? I went to the wiki and found the release notes but the download page still lists .01

0 HardikShah over 12 years ago in reply to Ben9619

TI__Mastermind 20245 points

Hi,

It may not have been release externally. Can you try with just booting up the PSP and than changing the mode. Take all binaries supplied with PSP and not EZSDK. As i strongly believe this seems to be some configuration problem from application rather than PSP.

0 Ben9619 over 12 years ago in reply to HardikShah

Intellectual 330 points

I ran into some a few dead ends trying to use the PSP. After some more experimentation I did make some progress though. I found that if I manually change the VPSS mode through sysfs, I get a 60Hz refresh rate and the display works. So right now I am at a point where this...

modprobe vpss sbufaddr=0xBFB00000 mode=hdmi:1280x1024@60,sd:ntsc i2c_mode=0

... does not work, but this...

echo 0 > /sys/devices/platform/vpss/display0/enabled

echo 1280x1024@60 > /sys/devices/platform/vpss/display0/mode

echo 1 > /sys/devices/platform/vpss/display0/enabled

... does work. Is it possible something is not getting set in VPSS as expected?

0 HardikShah over 12 years ago in reply to Ben9619

TI__Mastermind 20245 points

Hi,

This may be a bug in VPSS as this is not a heavily tested feature.

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1280x1024@60 HDMI output does not work?