linux-kernel - Re: [PATCH v2 02/10] media: hantro: Fix motion vectors usage condition

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Message-ID: <CAAEAJfCjUe=V8Sqj2Yqy-Su7iE=ptFDz40vg92bYqUS8XrE73w@mail.gmail.com>
Date:   Sun, 3 Nov 2019 00:09:42 +0100
From:   Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:     Jonas Karlman <jonas@...boo.se>
Cc:     Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Francois Buergisser <fbuergisser@...omium.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 02/10] media: hantro: Fix motion vectors usage condition

On Tue, 29 Oct 2019 at 02:25, Jonas Karlman <jonas@...boo.se> wrote:
>
> From: Francois Buergisser <fbuergisser@...omium.org>
>
> The setting of the motion vectors usage and the setting of motion
> vectors address are currently done under different conditions.
>
> When decoding pre-recorded videos, this results of leaving the motion
> vectors address unset, resulting in faulty memory accesses. Fix it
> by using the same condition everywhere, which matches the profiles
> that support motion vectors.
>
> Fixes: dea0a82f3d22 ("media: hantro: Add support for H264 decoding on G1")
> Signed-off-by: Francois Buergisser <fbuergisser@...omium.org>
> Signed-off-by: Ezequiel Garcia <ezequiel@...labora.com>
> Signed-off-by: Jonas Karlman <jonas@...boo.se>
> ---
>  drivers/staging/media/hantro/hantro_g1_h264_dec.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/media/hantro/hantro_g1_h264_dec.c b/drivers/staging/media/hantro/hantro_g1_h264_dec.c
> index 29130946dea4..a1cb18680200 100644
> --- a/drivers/staging/media/hantro/hantro_g1_h264_dec.c
> +++ b/drivers/staging/media/hantro/hantro_g1_h264_dec.c
> @@ -35,7 +35,7 @@ static void set_params(struct hantro_ctx *ctx)
>         if (sps->flags & V4L2_H264_SPS_FLAG_MB_ADAPTIVE_FRAME_FIELD)
>                 reg |= G1_REG_DEC_CTRL0_SEQ_MBAFF_E;
>         reg |= G1_REG_DEC_CTRL0_PICORD_COUNT_E;
> -       if (dec_param->nal_ref_idc)
> +       if (sps->profile_idc > 66 && dec_param->nal_ref_idc)
>                 reg |= G1_REG_DEC_CTRL0_WRITE_MVS_E;
>
>         if (!(sps->flags & V4L2_H264_SPS_FLAG_FRAME_MBS_ONLY) &&
> @@ -245,7 +245,7 @@ static void set_buffers(struct hantro_ctx *ctx)
>         vdpu_write_relaxed(vpu, dst_dma, G1_REG_ADDR_DST);
>
>         /* Higher profiles require DMV buffer appended to reference frames. */
> -       if (ctrls->sps->profile_idc > 66) {
> +       if (ctrls->sps->profile_idc > 66 && ctrls->decode->nal_ref_idc) {

How about a one-line function (purposely not a macro,
to have type-checking) ? I think this should emphasize the fact that
the condition
needs to be the same.

Thanks,
Ezequiel

>                 size_t pic_size = ctx->h264_dec.pic_size;
>                 size_t mv_offset = round_up(pic_size, 8);
>
> --
> 2.17.1
>