[U-Boot] [PATCH 0/2] ARM: tegra: enable GPU DT node

[Tom Warren]

> -----Original Message-----
> From: Alex Courbot
> Sent: Thursday, August 06, 2015 12:58 AM
> To: Tom Warren; Andreas Färber; u-boot at lists.denx.de
> Cc: linux-tegra at vger.kernel.org; gnurou at gmail.com; Stephen Warren;
> Guillaume Gardet
> Subject: Re: [U-Boot] [PATCH 0/2] ARM: tegra: enable GPU DT node
> 
> On 08/05/2015 08:24 AM, Tom Warren wrote:
> > Alex/Andreas,
> >
> >> -----Original Message-----
> >> From: Tom Warren
> >> Sent: Tuesday, August 04, 2015 8:41 AM
> >> To: 'Andreas Färber'; u-boot at lists.denx.de
> >> Cc: Alex Courbot; linux-tegra at vger.kernel.org; gnurou at gmail.com;
> >> Stephen Warren; Guillaume Gardet
> >> Subject: RE: [U-Boot] [PATCH 0/2] ARM: tegra: enable GPU DT node
> >>
> >> Andreas,
> >>
> >>> -----Original Message-----
> >>> From: Andreas Färber [mailto:afaerber at suse.de]
> >>> Sent: Tuesday, August 04, 2015 6:56 AM
> >>> To: u-boot at lists.denx.de
> >>> Cc: Alex Courbot; linux-tegra at vger.kernel.org; gnurou at gmail.com;
> >>> Stephen Warren; Tom Warren; Guillaume Gardet
> >>> Subject: Re: [U-Boot] [PATCH 0/2] ARM: tegra: enable GPU DT node
> >>>
> >>> Am 23.07.2015 um 13:46 schrieb Andreas Färber:
> >>>> Am 09.07.2015 um 09:32 schrieb Alexandre Courbot:
> >>>>> Tegra124 requires the bootloader to perform VPR initialization,
> >>>>> otherwise the GPU cannot be used by the system. Since using the
> >>>>> GPU without that initialization results in a hang, the GPU DT node
> >>>>> is left disabled, and it is the task of the bootloader to enable
> >>>>> it after ensuring it is safe to use the GPU.
> >>>>>
> >>>>> VPR init is already performed since patch df3443dfa449, but the
> >>>>> device tree was left untouched. This patch series performs this
> >>>>> last step and prepares the GPU intialization code to receive more
> >>>>> code for
> >>> newer chips.
> >>>>
> >>>> Tested-by: Andreas Färber <afaerber at suse.de>
> >>>>
> >>>> I've tested this patchset on v2015.07 with 4.2.0-rc3-00115-gc5dfd65
> >>>> - with these two patches I get a console login on HDMI again.
> >>>
> >>> Ping! Independent of the Linux and X11 discussions this thread has
> >>> drifted off into, these two patches are still missing in
> >>> v2015.10-rc1 and don't apply any more (as reported by Guillaume).
> >>> Can you please rebase
> >> and merge them?
> >> Is that request for me? Sorry, lost track of these patches since it
> >> appeared that there was an on-going discussion.
> >> If you're sure they're OK within the context of Tegra U-Boot, I'll
> >> apply them and send them with the next PR.
> >>
> >> Tom
> > Applied to u-boot-tegra/next (along with some other pending Tegra patches
> for clocks/PLL/SPI/ums/etc.). I added T210/P2571 support to this patchset.
> >
> > PTAL.  Also, there doesn't appear to be a 'gpu at 0,57000000' property in any
> t124/t210 DT file. Is that coming in another patch or one I missed?
> 
> Thanks Tom! I have tried your branch and can confirm it is booting Jetson TK1 as
> expected (i.e. the GPU is in a usable state).
> 
> The GPU node is not needed in U-boot's DT files (if that's what you meant). It is
> present in the kernel though, and that's the DT my patches will modify.
> 
> Alex.
Thanks, Alex.  I'll send a PR with your changes later today.

Tom
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nvpublic