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@lists.denx.de Cc: Alex Courbot; linux-tegra@vger.kernel.org; gnurou@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@suse.de] Sent: Tuesday, August 04, 2015 6:56 AM To: u-boot@lists.denx.de Cc: Alex Courbot; linux-tegra@vger.kernel.org; gnurou@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@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@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.