linux-kernel - Re: [PATCH 4/9] soc: mediatek: cmdq: Add cmdq_pkt

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Message-ID: <680fcb9a-d7e2-4a15-877e-09c01024ed53@collabora.com>
Date: Thu, 15 Feb 2024 11:40:47 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Chun-Kuang Hu <chunkuang.hu@...nel.org>,
 Matthias Brugger <matthias.bgg@...il.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [PATCH 4/9] soc: mediatek: cmdq: Add cmdq_pkt_nop() helper
 function

Il 15/02/24 01:49, Chun-Kuang Hu ha scritto:
> cmdq_pkt_nop() append nop command to the packet. nop command ask
> GCE to do no operation.
> 
> Signed-off-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>
> ---
>   drivers/soc/mediatek/mtk-cmdq-helper.c | 11 +++++++++++
>   include/linux/soc/mediatek/mtk-cmdq.h  | 16 ++++++++++++++++
>   2 files changed, 27 insertions(+)
> 
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index e982997117c2..1be950b4ec7f 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -369,6 +369,17 @@ int cmdq_pkt_eoc(struct cmdq_pkt *pkt)
>   }
>   EXPORT_SYMBOL(cmdq_pkt_eoc);
>   
> +int cmdq_pkt_nop(struct cmdq_pkt *pkt, u8 shift_pa)
> +{
> +	struct cmdq_instruction inst = { {0} };
> +
> +	/* Jumping to next instruction is equal to no operation */
> +	inst.op = CMDQ_CODE_JUMP;
> +	inst.value = CMDQ_INST_SIZE >> shift_pa;
> +	return cmdq_pkt_append_command(pkt, inst);
> +}
> +EXPORT_SYMBOL(cmdq_pkt_nop);
> +
>   int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
>   {
>   	struct cmdq_instruction inst = { {0} };
> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> index a67f719dec0b..8179ba5238f9 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -255,6 +255,17 @@ int cmdq_pkt_jump(struct cmdq_pkt *pkt, dma_addr_t addr, u8 shift_pa);
>    */
>   int cmdq_pkt_eoc(struct cmdq_pkt *pkt);
>   
> +/**
> + * cmdq_pkt_nop() - Append nop command to the CMDQ packet, ask GCE
> + *		    to do no operation.

  * cmdq_pkt_nop() - Append No-Operation (NOP) command to a CMDQ packet

After which...
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>