Without these changes DMA on DaVinci has never worked traditionally. We fixed this issue pretty early in DaVinci program ~2006 on the 2.6.10 treee. We are now in the process of forward porting the musb patches from that tree to the git tree. We did some performance enhancements/bug fixes on that tree and hope to make it available to the general community w.r.t MUSB. This (specific to DaVinci) and the following patches (musb generic) are in that direction. I discussed with Kevin on the DaVinci Git tree and Filipe here and they recommended that I take the changes to linux-usb, linux-omap tree (w.r.t musb changes) to get a wider audience for review and acceptance. Kevin would then pull in the changes as part of his regular synch ups. This patch (+ CPPI DMA changes) in a different form has already been tested in the DaVinci git community and it resolved the USB DMA issues and improved performance considerably as communicated by the community members like Neuros. I will be submitting the CPPI DMA changes as a seperate patch as it is big and based on preliminary review needs to be broken down significantly to enable better review and acceptance. Thanks for your comments. regards swami ________________________________________ From: David Brownell [david-b@xxxxxxxxxxx] Sent: Friday, August 22, 2008 12:45 AM To: Dmitry Krivoschekov; Subbrathnam, Swaminathan Cc: linux-omap@xxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx; felipe.balbi@xxxxxxxxx; Kevin Hilman Subject: Re: Patch [2/2] DaVinci CPPI TX DMA tasklet On Thursday 21 August 2008, Dmitry Krivoschekov wrote: > why don't rely on an endpoint interrupt which is generated > after a USB transaction is complete? That's what I thought *was* working a couple years ago... I take it that something broke since then? Or is this a corner case which didn't always work right? I'm not sure this would be appropriate for mainline until the DaVinci code can run there. There are a bunch of arch/arm/mach-davinci updates needed first. I know Kevin was looking at some of this, but just now I think enabling MUSB on a 2.6.27-rc4 DaVinci config means a broken build. - Dave-- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
