linux-kernel - Re: [PATCH v1, 1/1] soc: mediatek: cmdq: add cmdq_pkt_poll

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Message-ID: <e4328a0fd2c97d073793532d238abd781797fe13.camel@mediatek.com>
Date:   Fri, 21 Jan 2022 10:08:47 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Yongqiang Niu <yongqiang.niu@...iatek.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>
CC:     <devicetree@...r.kernel.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        David Airlie <airlied@...ux.ie>,
        Jassi Brar <jassisinghbrar@...il.com>,
        <linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        "Dennis YC Hsieh" <dennis-yc.hsieh@...iatek.com>,
        Fabien Parent <fparent@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        <linux-mediatek@...ts.infradead.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        mtk18742 <moudy.ho@...iatek.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1, 1/1] soc: mediatek: cmdq: add cmdq_pkt_poll_addr
 function

Hi, Yongqiang:

On Thu, 2022-01-20 at 15:43 +0800, Yongqiang Niu wrote:
> From: mtk18742 <moudy.ho@...iatek.com>
> 
> add cmdq_pkt_poll_addr function in cmdq helper functions
> 
> Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
> ---
>  drivers/soc/mediatek/mtk-cmdq-helper.c   | 39
> ++++++++++++++++++++++++
>  include/linux/mailbox/mtk-cmdq-mailbox.h |  1 +
>  include/linux/soc/mediatek/mtk-cmdq.h    |  2 ++
>  3 files changed, 42 insertions(+)
> 
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c
> b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index 3c8e4212d941..6c5cfb284140 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -344,6 +344,45 @@ int cmdq_pkt_set_event(struct cmdq_pkt *pkt, u16
> event)
>  }
>  EXPORT_SYMBOL(cmdq_pkt_set_event);
>  
> +s32 cmdq_pkt_poll_addr(struct cmdq_pkt *pkt, u32 value, u32 addr,
> u32 mask, u8 reg_gpr)
> +{
> +	struct cmdq_instruction inst = { {0} };
> +
> +	s32 err;
> +
> +	if (mask != 0xffffffff) {
> +		inst.op = CMDQ_CODE_MASK;
> +		inst.mask = ~mask;
> +		err = cmdq_pkt_append_command(pkt, inst);
> +		if (err != 0)
> +			return err;
> +
> +		addr = addr | 0x1;
> +	}
> +
> +	/* Move extra handle APB address to GPR */
> +	inst.op = CMDQ_CODE_MOVE;
> +	inst.value = addr;
> +	inst.sop = reg_gpr;
> +	inst.dst_t = 1;
> +	err = cmdq_pkt_append_command(pkt, inst);
> +	if (err != 0)
> +		pr_err("%s fail append command move addr to reg
> err:%d",
> +			__func__, err);

cmdq_pkt_assign() could assign a value to GPR, so remove this part.

> +
> +	inst.op = CMDQ_CODE_POLL;
> +	inst.value = value;
> +	inst.sop = reg_gpr;
> +	inst.dst_t = 1;
> +	err = cmdq_pkt_append_command(pkt, inst);
> +	if (err != 0)
> +		pr_err("%s fail append command poll err:%d",
> +			__func__, err);
> +
> +	return err;
> +}
> +EXPORT_SYMBOL(cmdq_pkt_poll_addr);
> +
>  int cmdq_pkt_poll(struct cmdq_pkt *pkt, u8 subsys,
>  		  u16 offset, u32 value)
>  {
> diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h
> b/include/linux/mailbox/mtk-cmdq-mailbox.h
> index 44365aab043c..a27329fd7c7f 100644
> --- a/include/linux/mailbox/mtk-cmdq-mailbox.h
> +++ b/include/linux/mailbox/mtk-cmdq-mailbox.h
> @@ -54,6 +54,7 @@
>   */
>  enum cmdq_code {
>  	CMDQ_CODE_MASK = 0x02,
> +	CMDQ_CODE_MOVE = 0x02,
>  	CMDQ_CODE_WRITE = 0x04,
>  	CMDQ_CODE_POLL = 0x08,
>  	CMDQ_CODE_JUMP = 0x10,
> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h
> b/include/linux/soc/mediatek/mtk-cmdq.h
> index ac6b5f3cba95..28dc5ce0ff03 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -280,4 +280,6 @@ int cmdq_pkt_finalize(struct cmdq_pkt *pkt);
>  int cmdq_pkt_flush_async(struct cmdq_pkt *pkt, cmdq_async_flush_cb
> cb,
>  			 void *data);
>  

Add comment for this function, parameters, and return value like other
interface.

Regards,
CK

> +s32 cmdq_pkt_poll_addr(struct cmdq_pkt *pkt, u32 value, u32 addr,
> u32 mask, u8 reg_gpr);
> +
>  #endif	/* __MTK_CMDQ_H__ */