linux-kernel - Re: [Nouveau] [PATCH 11/12] drm/nouveau: support GK20A in nouveau_accel

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Date:	Wed, 2 Apr 2014 10:23:39 -0400
From:	Ilia Mirkin <imirkin@...m.mit.edu>
To:	Alexandre Courbot <gnurou@...il.com>
Cc:	Ben Skeggs <skeggsb@...il.com>,
	"nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Ben Skeggs <bskeggs@...hat.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [Nouveau] [PATCH 11/12] drm/nouveau: support GK20A in nouveau_accel_init()

On Wed, Apr 2, 2014 at 10:14 AM, Alexandre Courbot <gnurou@...il.com> wrote:
>>>> +     /* Need to figure out how to handle sw for gk20a */
>>>> +     if (device->chipset == 0xea)
>>>> +             goto skip_sw_init;
>>>
>>> The commit message makes it sound like SW isn't needed since gk20a
>>> "lacks any display hardware". In that case the comment here doesn't make
>>> much sense.
>
> Correct. As far as I have looked (that is, not very far), SW methods
> are used for display-related functions, but there might be other
> use-cases too. Maybe someone who knows better can confirm?

http://cgit.freedesktop.org/~darktama/nouveau/tree/nvkm/engine/software/nvc0.c

Take a look at nvc0_software_mthd_mp_control -- that's used in the
mesa driver to... well, control those things :) They're related to
PGRAPH, which should be available on the GK20A. [Not sure what they do
though. One of them is about turning off error reporting.]

  -ilia
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