Ed Sweetman wrote:
David Dawes wrote:
[devel@xxxxxxxxxxx is probably a better place for this]
On Thu, Dec 18, 2003 at 12:36:25AM -0500, Ed Sweetman wrote:
I ran across a little oddity while working on the matrox driver. In MGAPutImage, the ScreenInfoPtr sent to it which is then converted to a MGAPtr does not have drmCtx set to a non-zero value even though dri is enabled and working at the time the function is called. I do not understand why this is and consider it to be a bug. Can anyone shed some light on this? This is of course working on the cvs pull of X.
You'll have to be a little more specific/precise. I don't see any field called "drmCtx" in the current XFree86 CVS version of the mga driver, for example.
David
Well that would be because I added it. Getting my source trees mixed up. Ok. sorry about that. But i do have another question.
The reason why I mixed that stuff up was because a friend and I have been working on giving mga DMA'd XV for kicks and giggles and that code was added in the very beginning. Now, we've borrowed a lot from the ati R128 driver in how it uses blits to do DMA. We felt this was viable because the MGA and R128 driver are very similar in how the code is structured and functions. However, this is the first time we've both worked on video cards at this level to this degree and we're having trouble getting the actual blit code to work correctly. I keep getting this error.
[drm:mga_verify_blit] *ERROR* *** bad blit: src=0x1 dst=0x3000000
Obviously I have no idea how to create a blit or something. The mga driver's blit structure is drastically different from the R128's so i've used some inference to fill in the missing pieces and what not. Fallbacks work correctly, so does using the option method of turning it off and on. Once this little hurdle of code is done then we should see the same type of dma benefits (if any) as the R128 card gets. The YV12 code is not expected to work as is for dma due to all the nasty multiplexing and all but there is another patch out there we're going to try and get a hold of that may eliminate the need for all that multiplexing and give us a function like the YUY2 one.
Anyway, if any developers wanna check out this blit code and tell me what i'm doing wrong with it... it's in mga_video.c in the MGADMA function.
just cd ./xc/programs/Xserver/hw/xfree86/drivers/mga and patch -p1 the attached patch.
or if the list doesn't like attached patches i'll host it on a temp site. http://signal-lost.homeip.net:3001/mga_xvdma.patch.bz2
If nobody can help we still plan on continuing with the patch so anyone interested in the results of all this messing around need not give up. :)
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