linux-kernel - Re: [Nouveau] [PATCH 09/12] drm/nouveau/graph: pad firmware code at load time

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Message-ID: <CACAvsv6eCoWEU7ZNd5158-V3n=ZVo5O04CZa2EWE78e_tZEXPA@mail.gmail.com>
Date:	Wed, 26 Mar 2014 14:22:48 +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>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [Nouveau] [PATCH 09/12] drm/nouveau/graph: pad firmware code at
 load time

On Mon, Mar 24, 2014 at 6:42 PM, Alexandre Courbot <acourbot@...dia.com> wrote:
> Pad the microcode to a multiple of 0x40, otherwise firmware will fail to
> run from non-prepadded firmware files.
>
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> ---
>  drivers/gpu/drm/nouveau/core/engine/graph/nvc0.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/nouveau/core/engine/graph/nvc0.c b/drivers/gpu/drm/nouveau/core/engine/graph/nvc0.c
> index f997a18f5760..367e72daf8b1 100644
> --- a/drivers/gpu/drm/nouveau/core/engine/graph/nvc0.c
> +++ b/drivers/gpu/drm/nouveau/core/engine/graph/nvc0.c
> @@ -768,6 +768,10 @@ nvc0_graph_init_fw(struct nvc0_graph_priv *priv, u32 fuc_base,
>                         nv_wr32(priv, fuc_base + 0x0188, i >> 6);
>                 nv_wr32(priv, fuc_base + 0x0184, code->data[i]);
>         }
> +
> +       /* code must be padded to 0x40 */
> +       for (; i < (((code->size / 4) + 0x3f) & ~0x3f); i++)
"for (; i & 0x3f; i++)" would work just as well :)

> +               nv_wr32(priv, fuc_base + 0x0184, 0);
>  }
>
>  static void
> --
> 1.9.1
>
> _______________________________________________
> Nouveau mailing list
> Nouveau@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/nouveau
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