From: Thierry Reding <thierry.reding@gmail.com>
To: Stephen Warren <swarren@wwwdotorg.org>
Cc: gnurou@gmail.com, Sjoerd Simons <sjoerd@luon.net>,
nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org, Ben Skeggs <bskeggs@redhat.com>,
linux-tegra@vger.kernel.org
Subject: Re: [5/5] ARM: tegra: jetson-tk1: enable GK20A GPU
Date: Thu, 25 Sep 2014 18:41:11 +0200 [thread overview]
Message-ID: <20140925164109.GA30382@ulmo> (raw)
In-Reply-To: <54243931.6050804@wwwdotorg.org>
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On Thu, Sep 25, 2014 at 09:48:01AM -0600, Stephen Warren wrote:
> On 09/25/2014 07:27 AM, Sjoerd Simons wrote:
> >Playing a bit with todays linux-next on my jetson, it seems this patch is
> >still required for enabling the GPU. Is there anything blocking it (firmware
> >not available yet in liux-firmware?)
>
> I think initially I was waiting for the DRM patch "drm/nouvea: support for
> probing platform devices" to be applied, but it looks like that's been
> applied already, so only patches 4 and 5 in this series are still
> outstanding.
>
> Alex, wasn't there also some issue where the VPR register had to be
> programmed, and if it wasn't there'd be a hang when the GPU registers were
> touched? If we've added code to Nouveau/tegradrm to detect that and avoid
> the problem, then I guess we can commit these last two patches for 3.19. A
> resend after the 3.18 merge window might help.
A patch that programs VPR was merged into U-Boot (though I don't think
it's made it into master yet). I'm not sure we can reasonably check for
that in Nouveau, given that the register is somewhere completely
unrelated. In fact I think the U-Boot patch was triggered by some
discussion about how to solve this and it was decided that it shouldn't
be done in the kernel, but U-Boot should set it up.
That said, perhaps one solution would be to make U-Boot enable the gk20a
device if it's set up the VPR and disable it otherwise?
Thierry
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WARNING: multiple messages have this Message-ID (diff)
From: Thierry Reding <thierry.reding@gmail.com>
To: Stephen Warren <swarren@wwwdotorg.org>
Cc: Sjoerd Simons <sjoerd@luon.net>,
Alexandre Courbot <acourbot@nvidia.com>,
Ben Skeggs <bskeggs@redhat.com>,
nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org,
gnurou@gmail.com
Subject: Re: [5/5] ARM: tegra: jetson-tk1: enable GK20A GPU
Date: Thu, 25 Sep 2014 18:41:11 +0200 [thread overview]
Message-ID: <20140925164109.GA30382@ulmo> (raw)
In-Reply-To: <54243931.6050804@wwwdotorg.org>
[-- Attachment #1: Type: text/plain, Size: 1462 bytes --]
On Thu, Sep 25, 2014 at 09:48:01AM -0600, Stephen Warren wrote:
> On 09/25/2014 07:27 AM, Sjoerd Simons wrote:
> >Playing a bit with todays linux-next on my jetson, it seems this patch is
> >still required for enabling the GPU. Is there anything blocking it (firmware
> >not available yet in liux-firmware?)
>
> I think initially I was waiting for the DRM patch "drm/nouvea: support for
> probing platform devices" to be applied, but it looks like that's been
> applied already, so only patches 4 and 5 in this series are still
> outstanding.
>
> Alex, wasn't there also some issue where the VPR register had to be
> programmed, and if it wasn't there'd be a hang when the GPU registers were
> touched? If we've added code to Nouveau/tegradrm to detect that and avoid
> the problem, then I guess we can commit these last two patches for 3.19. A
> resend after the 3.18 merge window might help.
A patch that programs VPR was merged into U-Boot (though I don't think
it's made it into master yet). I'm not sure we can reasonably check for
that in Nouveau, given that the register is somewhere completely
unrelated. In fact I think the U-Boot patch was triggered by some
discussion about how to solve this and it was decided that it shouldn't
be done in the kernel, but U-Boot should set it up.
That said, perhaps one solution would be to make U-Boot enable the gk20a
device if it's set up the VPR and disable it otherwise?
Thierry
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next prev parent reply other threads:[~2014-09-25 16:41 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-19 9:24 [PATCH 0/5] drm/nouveau: platform devices and GK20A probing Alexandre Courbot
2014-05-19 9:24 ` Alexandre Courbot
2014-05-19 9:24 ` [PATCH 2/5] ARM: tegra: of: add GK20A device tree binding Alexandre Courbot
2014-05-19 9:24 ` Alexandre Courbot
2014-05-19 21:14 ` Stephen Warren
2014-05-19 21:14 ` Stephen Warren
[not found] ` <537A7450.5030904-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2014-05-23 7:13 ` Alexandre Courbot
2014-05-23 7:13 ` Alexandre Courbot
[not found] ` <1400491450-19223-1-git-send-email-acourbot-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2014-05-19 9:24 ` [PATCH 1/5] drm/nouveau: support for probing platform devices Alexandre Courbot
2014-05-19 9:24 ` Alexandre Courbot
2014-05-19 9:24 ` [PATCH 3/5] ARM: tegra: add GK20A GPU to Tegra124 DT Alexandre Courbot
2014-05-19 9:24 ` Alexandre Courbot
2014-05-19 21:16 ` Stephen Warren
2014-05-19 21:16 ` Stephen Warren
2014-05-19 9:24 ` [PATCH 4/5] ARM: tegra: venice2: enable GK20A GPU Alexandre Courbot
2014-05-19 9:24 ` Alexandre Courbot
2014-05-19 9:24 ` [PATCH 5/5] ARM: tegra: jetson-tk1: " Alexandre Courbot
2014-05-19 9:24 ` Alexandre Courbot
[not found] ` <1400491450-19223-6-git-send-email-acourbot-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2014-09-25 13:27 ` [5/5] " Sjoerd Simons
2014-09-25 13:27 ` Sjoerd Simons
2014-09-25 15:48 ` Stephen Warren
2014-09-25 16:41 ` Thierry Reding [this message]
2014-09-25 16:41 ` Thierry Reding
2014-09-25 18:07 ` Stephen Warren
2014-09-25 18:07 ` Stephen Warren
[not found] ` <542459C5.9060505-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2014-09-26 9:59 ` Thierry Reding
2014-09-26 9:59 ` Thierry Reding
2014-09-25 18:10 ` Sjoerd Simons
2014-09-25 18:10 ` Sjoerd Simons
2014-09-26 10:01 ` Thierry Reding
2014-09-26 10:01 ` Thierry Reding
[not found] ` <54243931.6050804-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2014-09-26 4:44 ` Alexandre Courbot
2014-09-26 4:44 ` Alexandre Courbot
2014-05-19 10:04 ` [PATCH 0/5] drm/nouveau: platform devices and GK20A probing Lucas Stach
2014-05-19 10:04 ` Lucas Stach
[not found] ` <1400493868.8467.26.camel-WzVe3FnzCwFR6QfukMTsflXZhhPuCNm+@public.gmane.org>
2014-05-19 10:06 ` Thierry Reding
2014-05-19 10:06 ` Thierry Reding
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