rotation + VRFB rotation on linux

Jennifer Zou

Hi All

I would like to know the status of IR SDOCM00069806 in AM35x-OMAP35x-PSP_03.00.01.06_Release_Notes:

SDOCM00069806

Video Display: GFX FIFO underflow observed when using DSS with higher resolution + VRFB rotation

My customer wants to implement the screen/video rotation feature with a high resolution LCD screen (1366*768). Is it possible to implement 90,180,270 rotations during video playing with VRFB/DMA method which should cause huge bandwidth consumption? Or we can only implement it in application layer?

If yes, how about the performance? If no, do you know the maximum resolution limitation to implement this function?

Thanks a lot for your help!

over 15 years ago

0 Vaibhav Hiremath over 15 years ago

TI__Expert 8180 points

Hi Jennifer,

There won't be a direct solution for this issue, as you rightly pointed out here, this is completely bandwidth consumption issue which we have to fine-tune (and optimize) for given use-case. Some of the options below can be tried out or looked at (from DSS point of view) -

- Delay write access and make read faster in case of 90 & 270 degree rotation (Suggested in TRM) - we already implemented this but still it won't get this issue completely away.

- Overlay optimization: Not part of PSP 03.00.01.06 release but is available as a patch on top of it.

As far as software based rotation is concerned, I can not help you much here, but its seems obvious that it is going to affect the performance.

Thanks,

Vaibhav

0 Jennifer Zou over 15 years ago in reply to Vaibhav Hiremath

TI__Intellectual 1490 points

Vaibhav,

Thanks for your reply. do you know where can I find the overlay optimization patch? Thanks!

Kind Regards

Jennifer

0 Vaibhav Hiremath over 15 years ago in reply to Jennifer Zou

TI__Expert 8180 points

Hi Jennifer,

You can access the patch from http://git.mansr.com/?p=linux-omap;a=commit;h=6bd3b5dc911f73168b51505dce489680f194ad07. Also there is one bug fix ontop of PSP03.00.01.06 release (attached here) which requires for my earlier patch for GFX underflow issue.

NOTE: Rename the file to .patch.

Please let me know if you face any issues.

Thanks,

Vaibhav

Processors

Processors forum

rotation + VRFB rotation on linux