Hi,
Subbrathnam, Swaminathan wrote:
Viral,
Did you happen to apply all the related patches on the 2.6.10 kernel from TI?
I am not sure if I got you correctly or not.
But, I am using (as I said) MVL 2.6.10_mvl401 Kernel and that has (if I
understand correctly) 2.6.10 kernel + ./mvl_patches/mvl*1721*.patch
I was looking for if any latest release available which may have more
number of mvl*.patch and that might include CPPI DMA related fixes as well.
Anyway, here is what I am planning to do:
1. Going through git log for *musb* on mainline kernel
2. Decide what are the patches relevant to musb and cppi DMA for iso
transfer.
3. Study them to understand the logic change. Implement same logic
change for 2.6.10
I am hopeful that I will make it fully functional if not getting drastic
performance improvement.
And I have already done a good start. I just *fixed* (or backported
nicely) "musb_host_tx 1371: null urb, TXCSR2 = 3400" which I was getting
on second time ISO transfer.
I also came across this link,
http://linux.omap.com/pipermail/davinci-linux-open-source/2008-June/006917.html
Wherein you just mentioned that you have *forward port* 45 patches. I
was also trying to look for those 45 patches which were for 2.6.10 as
you mentioned.
Thanks for the help again.
Thanks,
Viral
If not that would be the starting point.
Regards
swami
-----Original Message-----
From: linux-usb-owner@xxxxxxxxxxxxxxx [mailto:linux-usb-owner@xxxxxxxxxxxxxxx] On Behalf Of vkm
Sent: Wednesday, November 25, 2009 11:07 AM
To: linux-usb@xxxxxxxxxxxxxxx
Subject: DaVinci MUSB controller with CPPI DMA
Hi,
I am doing development for some Audio USB device on TI's DaVinci DVM
6446 board. I am using MVL 2.6.10_mvl401 kernel.
Being it USB Audio device, it does ISO transfer and this apparently
doesnt work if I have CPPI DMA enabled.
I know there have been lots of work happened post 2.6.10 kernel and
there are certainly many bugs when you enable CPPI DMA.
I just would like to know if someone tried to *backport* all recent
fixes to 2.6.10.
Anyone from MV or TI ? Any help would be appreciated.
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