linux-kernel - Re: [PATCH] nouveau/drm/fifo: fix ENG_RUNLIST register address

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Message-ID: <CACAvsv5MQPOE+uBTXyMzjiQ514++LGKgOS7oObdRTT=VQLVRRw@mail.gmail.com>
Date:	Mon, 10 Feb 2014 14:25:19 +1000
From:	Ben Skeggs <skeggsb@...il.com>
To:	Alexandre Courbot <acourbot@...dia.com>
Cc:	Ben Skeggs <bskeggs@...hat.com>,
	"nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
	Alexandre Courbot <gnurou@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] nouveau/drm/fifo: fix ENG_RUNLIST register address

On Fri, Feb 7, 2014 at 11:22 PM, Alexandre Courbot <acourbot@...dia.com> wrote:
> Address of the ENG_RUNLIST register should be 0x002284 + (engine * 8),
> not 0x002284 + (engine * 4).
>
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> ---
> Stumbled upon this one and I'm quite certain the offset was not correct.
> This is inconsequential for GK20A which only features one runlist, but
> other GPUs might run into troubles because of this. Not tested, just
> reported for your consideration.
I noticed this also while doing some other work I haven't committed
yet.  I'll push this patch ahead of that other work though.

Thanks,
Ben.

>
> FWIW, the Android GK20A driver uses the same offset calculation.
>
>  drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c b/drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c
> index 99c9dee..dbc3ff6 100644
> --- a/drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c
> +++ b/drivers/gpu/drm/nouveau/core/engine/fifo/nve0.c
> @@ -112,7 +112,7 @@ nve0_fifo_runlist_update(struct nve0_fifo_priv *priv, u32 engine)
>
>         nv_wr32(priv, 0x002270, cur->addr >> 12);
>         nv_wr32(priv, 0x002274, (engine << 20) | (p >> 3));
> -       if (!nv_wait(priv, 0x002284 + (engine * 4), 0x00100000, 0x00000000))
> +       if (!nv_wait(priv, 0x002284 + (engine * 8), 0x00100000, 0x00000000))
>                 nv_error(priv, "runlist %d update timeout\n", engine);
>         mutex_unlock(&nv_subdev(priv)->mutex);
>  }
> --
> 1.8.5.3
>
> _______________________________________________
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> dri-devel@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
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