linux-kernel - Re: [PATCH] soc: mediatek: cmdq: Remove unused helper funciton

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Date:   Tue, 21 Feb 2023 00:39:43 +0800
From:   Chun-Kuang Hu <chunkuang.hu@...nel.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soc: mediatek: cmdq: Remove unused helper funciton

Hi, Angelo:

AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com> 於
2023年2月20日 週一 下午7:31寫道：
>
> Il 20/02/23 00:34, Chun-Kuang Hu ha scritto:
> > cmdq_pkt_create(), cmdq_pkt_destroy(), and cmdq_pkt_flush_async()
> > are not used by all client drivers (MediaTek drm driver and
> > MediaTek mdp3 driver), so remove them.
> >
> > Signed-off-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>
>
> My next cleanup step would be to migrate both the MediaTek DRM driver
> and MDP3 to use the common functions present in mtk-cmdq-helper.
> Function mtk_drm_cmdq_pkt_create() is (almost) a clone of cmdq_pkt_create().

It's good to hear that you have plan to refine cmdq_pkt_create(). I
have one plan and wish you may consider in your patch. The plan is to
remove cl in struct cmdq_pkt because cl is used for channel
information and the client would have the channel information, so it's
not necessary to store the channel information in every packet. In
cmdq_pkt_jump() and cmdq_pkt_finalize() use cl to get
cmdq_get_shift_pa(), I think it's not necessary to get shift pa every
cmdq_pkt_jump() and every cmdq_pkt_finalize(), so client could
cmdq_get_shift_pa() once and pass this information to cmdq_pkt_jump()
and cmdq_pkt_finalize().

Regards,
Chun-Kuang.

>
> NACK.
>
> Regards,
> Angelo