linux-kernel - Re: [PATCH v7 05/20] soc: mediatek: mtk-cmdq: Add cmdq_pkt_jump_rel_temp() for removing shift

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Message-ID: <291edc0a-a892-428f-a2da-29e192f5a2e8@collabora.com>
Date: Thu, 9 Oct 2025 13:27:18 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Jason-JH Lin <jason-jh.lin@...iatek.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Jassi Brar <jassisinghbrar@...il.com>,
 Chun-Kuang Hu <chunkuang.hu@...nel.org>,
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Matthias Brugger <matthias.bgg@...il.com>,
 Nicolas Dufresne <nicolas@...fresne.ca>, Nancy Lin <nancy.lin@...iatek.com>,
 Singo Chang <singo.chang@...iatek.com>,
 Paul-PL Chen <paul-pl.chen@...iatek.com>, Moudy Ho <moudy.ho@...iatek.com>,
 Xiandong Wang <xiandong.wang@...iatek.com>,
 Sirius Wang <sirius.wang@...iatek.com>, Fei Shao <fshao@...omium.org>,
 Chen-yu Tsai <wenst@...omium.org>,
 Project_Global_Chrome_Upstream_Group@...iatek.com,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, linux-mediatek@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org
Subject: Re: [PATCH v7 05/20] soc: mediatek: mtk-cmdq: Add
 cmdq_pkt_jump_rel_temp() for removing shift_pa

Il 27/08/25 13:37, Jason-JH Lin ha scritto:
> Since shift_pa will be stored into the cmdq_mobx_priv of cmdq_pkt, all
> the shif_pa parameters in CMDQ helper APIs can be removed.
> 
> Add cmdq_pkt_jump_rel_temp() for the current users of cmdq_pkt_jump_rel(),
> and then remove shift_pa after all users have migrated to the new APIs.
> 
> Fixes: ade176534112 ("soc: mediatek: cmdq: Add parameter shift_pa to cmdq_pkt_jump()")
> Signed-off-by: Jason-JH Lin <jason-jh.lin@...iatek.com>
> ---
>   drivers/soc/mediatek/mtk-cmdq-helper.c | 6 ++++++
>   include/linux/soc/mediatek/mtk-cmdq.h  | 9 +++++++++
>   2 files changed, 15 insertions(+)
> 
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index 8feeaa320359..4b1591e5b1ae 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -515,6 +515,12 @@ int cmdq_pkt_jump_rel(struct cmdq_pkt *pkt, s32 offset, u8 shift_pa)
>   }
>   EXPORT_SYMBOL(cmdq_pkt_jump_rel);
>   
> +int cmdq_pkt_jump_rel_temp(struct cmdq_pkt *pkt, s32 offset, u8 shift_pa)
> +{
> +	return cmdq_pkt_jump_rel(pkt, offset, shift_pa);
> +}
> +EXPORT_SYMBOL(cmdq_pkt_jump_rel_temp);
> +
>   int cmdq_pkt_eoc(struct cmdq_pkt *pkt)
>   {
>   	struct cmdq_instruction inst = {
> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> index 0c3906e8ad19..5e3a0e807980 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -377,6 +377,9 @@ static inline int cmdq_pkt_jump(struct cmdq_pkt *pkt, dma_addr_t addr, u8 shift_
>    */
>   int cmdq_pkt_jump_rel(struct cmdq_pkt *pkt, s32 offset, u8 shift_pa);
>   
> +/* This wrapper has to be removed after all users migrated to jump_rel */
> +int cmdq_pkt_jump_rel_temp(struct cmdq_pkt *pkt, s32 offset, u8 shift_pa);

/**
  * cmdq_pkt_jump_rel_v0() - Temporary wrapper for new CMDQ helper API
  * @pkt:   xyz (copy the descriptions from cmdq_pkt_jump_rel() here)
  * @offset: whatever
  * @shift_pa: [DEPRECATED] abc
  *
  * This function is a temporary wrapper that was introduced only for ease of
  * migration of the many users of the CMDQ API located in multiple kernel
  * subsystems.
  *
  * This has to be removed after all users are migrated to the newer CMDQ API.
  */
static inline int cmdq_pkt_jump_rel_v0(struct cmdq_pkt *pkt, s32 offset, u8 shift_pa)
{
	return cmdq_pkt_jump_rel(pkt, offset, shift_pa);
}

...so you don't even need to add it in mtk-cmdq-helper.c: less files to care about.

> +
>   /**
>    * cmdq_pkt_eoc() - Append EOC and ask GCE to generate an IRQ at end of execution
>    * @pkt:	The CMDQ packet
> @@ -506,6 +509,12 @@ static inline int cmdq_pkt_jump_rel(struct cmdq_pkt *pkt, s32 offset, u8 shift_p
>   	return -EINVAL;
>   }
>   
> +/* This wrapper has to be removed after all users migrated to jump_rel */
> +static inline int cmdq_pkt_jump_rel_temp(struct cmdq_pkt *pkt, s32 offset, u8 shift_pa)
> +{
> +	return -EIMVAL;
> +}
> +
>   static inline int cmdq_pkt_eoc(struct cmdq_pkt *pkt)
>   {
>   	return -EINVAL;