linux-kernel - Re: [PATCH v6] media: mtk-vpu: Ensure alignment of 8 for DTCM buffer

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Message-ID: <CAEXTbpcbuRawcqnTQeuSD9Qpym25bpH+2hjHSTA9A2EbxtixGA@mail.gmail.com>
Date:   Tue, 30 May 2023 16:16:53 +0800
From:   Pin-yen Lin <treapking@...omium.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        linux-mediatek@...ts.infradead.org,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Minghsiu Tsai <minghsiu.tsai@...iatek.com>,
        Houlong Wei <houlong.wei@...iatek.com>,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        linux-media@...r.kernel.org, Hsin-Yi Wang <hsinyi@...omium.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Alexandre Courbot <acourbot@...omium.org>
Subject: Re: [PATCH v6] media: mtk-vpu: Ensure alignment of 8 for DTCM buffer

Hi Angelo,

Thanks for letting me know. Then, this patch is not needed.

Regards,
Pin-yen

On Mon, May 29, 2023 at 4:31 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> wrote:
>
> Il 26/05/23 08:31, Pin-yen Lin ha scritto:
> > From: Alexandre Courbot <acourbot@...omium.org>
> >
> > When running memcpy_toio:
> > memcpy_toio(send_obj->share_buf, buf, len);
> > it was found that errors appear if len is not a multiple of 8:
> >
> > [58.350841] mtk-mdp 14001000.rdma: processing failed: -22
> >
> > This is because in ARM64, memcpy_toio does byte-size access
> > when the length is not a multiple of 8 while access to the
> > vpu iomem must be 4 aligned.
> >
> > This patch ensures the copy of a multiple of 8 size by calling
> > round_up(len, 8) when copying.
> >
> > Fixes: e6599adfad30 ("media: mtk-vpu: avoid unaligned access to DTCM buffer.")
> > Signed-off-by: Alexandre Courbot <acourbot@...omium.org>
> > Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
> > Signed-off-by: Pin-yen Lin <treapking@...omium.org>
> > Reviewed-by: Houlong Wei <houlong.wei@...iatek.com>
> > Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> >
> > ---
> > This is a re-send of v5 because it was marked obsolete, but this patch
> > is required for MT8173 platforms.
> >
>
> Hello,
> I have solved this issue in a different way and the commit was already picked.
>
> Please check:
> ab14c99c035d ("media: platform: mtk-mdp: Fix mdp_ipi_comm structure alignment")
>
> Regards,
> Angelo
>