[U-Boot] [PATCH v8] usb: align buffers at cacheline

[Marek Vasut]

Dear Tom Warren,

> Marek,
> 
> > -----Original Message-----
> > From: Marek Vasut [mailto:marex at denx.de]
> > Sent: Monday, April 02, 2012 9:12 AM
> > To: Tom Warren
> > Cc: Puneet Saxena; Mike Frysinger; u-boot at lists.denx.de;
> > sjg at chromium.org; linux at bohmer.net; trini at ti.com;
> > albert.u.boot at aribaud.net
> > Subject: Re: [PATCH v8] usb: align buffers at cacheline
> > 
> > Dear Tom Warren,
> > 
> > > Marek, Puneet, et al.,
> > > 
> > > > -----Original Message-----
> > > > From: Marek Vasut [mailto:marex at denx.de]
> > > > Sent: Monday, March 19, 2012 8:47 AM
> > > > To: Tom Warren
> > > > Cc: Puneet Saxena; Mike Frysinger; u-boot at lists.denx.de;
> > > > sjg at chromium.org; linux at bohmer.net; trini at ti.com;
> > > > albert.u.boot at aribaud.net
> > > > Subject: Re: [PATCH v8] usb: align buffers at cacheline
> > > > 
> > > > Dear Tom Warren,
> > > > 
> > > > > Marek,
> > > > > 
> > > > > > -----Original Message-----
> > > > > > From: Marek Vasut [mailto:marek.vasut at gmail.com]
> > > > > > Sent: Monday, March 19, 2012 7:43 AM
> > > > > > To: Puneet Saxena
> > > > > > Cc: Mike Frysinger; u-boot at lists.denx.de; sjg at chromium.org;
> > > > > > linux at bohmer.net; trini at ti.com; Tom Warren
> > > > > > Subject: Re: [PATCH v8] usb: align buffers at cacheline
> > > > > > 
> > > > > > Dear Puneet Saxena,
> > > > > > 
> > > > > > > Hi Marek,
> > > > > > > I adapted my patch for git://git.denx.de/u-boot-usb.git master
> > > > > > > branch. As the build for target "Seaboard" is broken once I
> > > > > > > enable USB in Seaboard.h, I am unable to test my changes on "u-
> > 
> > boot-usb".
> > 
> > > > > > u-boot-usb is forked off the mainline u-boot.git ... tegra stuff
> > > > > > likely isn't pulled there. Simon, can you tell me when this is
> > > > > > gonna be
> > > > 
> > > > there?
> > > > 
> > > > > Simon's USB/fdt patch set will be pulled into -arm first, then
> > > > > -main, when he adapts the 'panic' putc patchset (implement
> > > > > pre-console putc for fdt
> > > > > warning) to meet with Wolfgang's approval. Once that's done
> > > > > (hopefully early this week), I can submit another pull request to
> > > > > finally get this series in.
> > > > > 
> > > > > Simon - can we have an ETA?
> > > > 
> > > > I'd love to see some ETA on u-boot-arm push from Albert Aribaud :-(
> > > > Albert, how're you doing ?
> > > > 
> > > > Thanks!
> > > 
> > > u-boot-tegra/master has the fdt/USB patches, and has been pulled into
> > > ARM master.
> > > 
> > > We need the cacheline/buffer alignment patch now, to remove the
> > > volcanic spew whenever you do any USB commands.
> > > 
> > > Can you guys (Puneet & Marek, and Mike/Simon if necessary) work
> > > together to get this in soon?
> > 
> > Ain't you gonna help us? I believe the patch is really close to be
> > usable, it just needs some easy debugging, won't you volunteer, it'd
> > really help? :)
> 
> I can apply the latest patch (v8?) and see how much spew is still present,
> but I (a) have no expertise in cache/USB issues and (b) have a ton of
> patches to apply/push for Tegra2 and (as soon as those are in) Tegra3, so
> my BW is limited, and finally (c) this is Puneet's work, and I'd like to
> see him complete it (with help from the list).

Well, everyone does. And that's how FOSS works -- you scratch your own itch by 
sending a patch, thus helping everyone else ;-)

And hey, my boards don't have caches enabled (yet) so this is low-prio for me. 
Sure, if someone has this as a high-prio thing, patch is very welcome :)

> 
> Tom
> 
> > > Thanks,
> > > 
> > > Tom
> > > 
> > > > > Tom
> > > > > 
> > > > > > > I would have to merge lots of changes from "denx-uboot-tegra"
> > > > > > > to make it working for "u-boot-usb.git" master branch.
> > > > > > > I can send the adapted patch if it's needed.
> > > > > > 
> > > > > > The problem I see is that there are important USB patches in
> > > > > > mainline, though they are not in -tegra. So the approach I'd
> > > > > > take if I were you would be to rebase -tegra atop of mainline
> > > > > > for yourself and then apply your patch. Does that work for you?
> > > > > > 
> > > > > > > Thanks,
> > > > > > > Puneet
> > > > > > 
> > > > > > Thanks!
> > > > > > 
> > > > > > Best regards,
> > > > > > Marek Vasut
> > > > 
> > > > Best regards,
> > > > Marek Vasut