Help! How to accelerate the display subsystem?

yuqing cai

Other Parts Discussed in Thread: OMAP3530

Hi~

I am running the Wince6.0 on the OMAP3530 target.
The graphic interface is handled by display subsystem without SGX, but I found the efficiency is too low,
for example, I create a window(640 * 480), and my gold is to refresh the window(update the window 's content) 50 times per second,
but It's 15~20 times at most.
My question is how to accelerate the display subsystem and make a good efficiency? Should I use the SGX?

over 14 years ago

Madhvi over 14 years ago

TI__Expert 5320 points

refer to this wiki:

http://processors.wiki.ti.com/index.php/WinCE-TIBSP_3D_Graphics

yuqing cai over 14 years ago

Intellectual 740 points

http://you.video.sina.com.cn/api/sinawebApi/outplayrefer.php/vid=51110612_1934354272/s.swf

I make a video for my target. We can see the window drawing rate is too slow.

OMAP3530 is running at 500MHz with Cache Enable(L1 & L2), I don't use the SGX or DSP.

I configure the attributes and DMA register as below, is it correct?
Is it necessary to use SGX to accelerate the display??

OUTREG32(&pDispcRegs->DISPC_GFX_ATTRIBUTES,
        DISPC_GFX_ATTR_GFXBURSTSIZE_16x32 |            // DMA Burst size 16 * 32 Bit
        DISPC_GFX_ATTR_GFXFORMAT(0x8)                          // RGB 24 (unpacked in 24-bit container)
);

// Pipeline FIFO and DMA settings
dwFifoSize = INREG32(&pDispcRegs->DISPC_GFX_FIFO_SIZE_STATUS) & 0x7FF;
OUTREG32(&pDispcRegs->DISPC_GFX_FIFO_THRESHOLD,
        DISPC_GFX_FIFO_THRESHOLD_HIGH(dwFifoSize - 1) |
        DISPC_GFX_FIFO_THRESHOLD_LOW(dwFifoSize - 64)

);

Madhvi over 14 years ago in reply to yuqing cai

TI__Expert 5320 points

I am sorry I misunderstood your question earlier. In WinCE 6.0, we dont have SGX performing blits for desktop display. Its currently used only for 3-d graphics. is there a reason you are trying to run the system at 500 MHz? For test purposes, can you run the system at 600MHz and see if the performance improves? Also, for test purposes can you use 16bpp RGB? We havent tested the performance using 24bpp format.

-Madhvi

yuqing cai over 14 years ago in reply to Madhvi

Intellectual 740 points

Hi, Madhvi,Thanks for your reply. :~)
I am trying to use the SGX, and I have 2 questions.

1. My WinCE6.0 BSP is build by ourself but not the TI's, is it possible to use the PowerVR DDK published in TI's official BSP?
2. Does the PowerVR DDK can accelerate the WinCE desktop efficiency?

Madhvi over 14 years ago in reply to yuqing cai

TI__Expert 5320 points

yuqing cai said:

1. My WinCE6.0 BSP is build by ourself but not the TI's, is it possible to use the PowerVR DDK published in TI's official BSP?

Is your BSP derived from TI ARM A8 BSP? If yes, then have you modified the display driver? If no, then yes you might be able to use the PowerVR DDK. I dont recall any other dependencies but give it a try. Also, PowerVR DDK will only accelerate OpenGL or OpenVG apps and not the desktop display.

yuqing cai said:

2. Does the PowerVR DDK can accelerate the WinCE desktop efficiency?

No.

yuqing cai over 14 years ago in reply to Madhvi

Intellectual 740 points

If I want to accelerate desktop efficiency, how? Is there any document about this?

Madhvi over 14 years ago in reply to yuqing cai

TI__Expert 5320 points

First, you need to figure out where the bottleneck is. Were you able to run any of the tests that I mentioned earlier - 600MHz and 16bpp?

-Madhvi

yuqing cai over 14 years ago in reply to Madhvi

Intellectual 740 points

Yes, I tried, but the problem remains... ...
I will keep on finding the bottleneck. :~)

yuqing cai over 14 years ago in reply to yuqing cai

Intellectual 740 points

The problem remains, It's really driving me crazy. :~(

yuqing cai over 14 years ago in reply to Madhvi

Intellectual 740 points

Hi, I think I have found out the bottleneck where is.

TI 's DSS driver is a DDGPE driver(it use DMA to move data in frame buffer), but I am using the DDI driver on my target.
I don't use DMA on the data operation, I think this is our bottleneck.

yuqing cai over 14 years ago in reply to yuqing cai

Intellectual 740 points

Problem solved! DMA is the key, The window (400 * 400) frame rate can reach 100+ fps.

http://you.video.sina.com.cn/api/sinawebApi/outplayrefer.php/vid=52501732_1934354272_aEngSyo6Bm7K+l1lHz2stqkP7KQNt6nkgGmwuFegJwlbQ0/XM5GcYNgH4S7VAtkEqDhAQZo6df8h1B8/s.swf

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Help! How to accelerate the display subsystem?