linux-kernel - Re: [PATCH 08/15] soc: mediatek: Add cmdq_pkt_finalize

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Date:   Sat, 23 Sep 2023 20:08:17 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     "Jason-JH.Lin" <jason-jh.lin@...iatek.com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     Conor Dooley <conor+dt@...nel.org>,
        Jason-ch Chen <jason-ch.chen@...iatek.com>,
        Johnson Wang <johnson.wang@...iatek.com>,
        Elvis Wang <Elvis.Wang@...iatek.com>,
        Singo Chang <singo.chang@...iatek.com>,
        Nancy Lin <nancy.lin@...iatek.com>,
        Shawn Sung <shawn.sung@...iatek.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH 08/15] soc: mediatek: Add cmdq_pkt_finalize_loop to CMDQ
 driver

On 18/09/2023 21:21, Jason-JH.Lin wrote:
> Add cmdq_pkt_finalize_loop to CMDQ driver.
> 
> cmdq_pkt_finalize_loop appends end of command(EOC) instruction and
> jump to start of command buffer instruction to make the command
> buffer loopable.
> 
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> ---
>  drivers/soc/mediatek/mtk-cmdq-helper.c | 23 +++++++++++++++++++++++
>  include/linux/soc/mediatek/mtk-cmdq.h  |  8 ++++++++
>  2 files changed, 31 insertions(+)
> 
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index 4be2a18a4a02..bbb127620bb3 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -475,6 +475,29 @@ int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
>  }
>  EXPORT_SYMBOL(cmdq_pkt_finalize);
>  
> +int cmdq_pkt_finalize_loop(struct cmdq_pkt *pkt)
> +{
> +	struct cmdq_instruction inst = { {0} };
> +	int err;
> +
> +	/* insert EOC and generate IRQ for each command iteration */
> +	inst.op = CMDQ_CODE_EOC;
> +	inst.value = CMDQ_EOC_IRQ_EN;
> +	err = cmdq_pkt_append_command(pkt, inst);
> +	if (err < 0)
> +		return err;
> +
> +	/* JUMP to start of pkt */
> +	err = cmdq_pkt_jump(pkt, pkt->pa_base);
> +	if (err < 0)
> +		return err;
> +
> +	pkt->loop = true;
> +
> +	return err;
> +}
> +EXPORT_SYMBOL(cmdq_pkt_finalize_loop);

NAK. No users (and please carefully think before you answer that your
other patch uses it).

Best regards,
Krzysztof