linux-kernel - Re: [PATCH v1 06/12] soc: mediatek: cmdq: add assign function

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Message-ID: <1574660121.26500.1.camel@mtksdaap41>
Date:   Mon, 25 Nov 2019 13:35:21 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Dennis YC Hsieh <dennis-yc.hsieh@...iatek.com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <wsd_upstream@...iatek.com>,
        Bibby Hsieh <bibby.hsieh@...iatek.com>,
        Houlong Wei <houlong.wei@...iatek.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1 06/12] soc: mediatek: cmdq: add assign function

Hi, Dennis:

On Thu, 2019-11-21 at 17:12 +0800, Dennis YC Hsieh wrote:
> Add assign function in cmdq helper which assign constant value into
> internal register by index.
> 
> Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@...iatek.com>
> ---
>  drivers/soc/mediatek/mtk-cmdq-helper.c   |   24 +++++++++++++++++++++++-
>  include/linux/mailbox/mtk-cmdq-mailbox.h |    1 +
>  include/linux/soc/mediatek/mtk-cmdq.h    |   14 ++++++++++++++
>  3 files changed, 38 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index 274f6f3..d419e99 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -14,6 +14,7 @@
>  #define CMDQ_EOC_IRQ_EN		BIT(0)
>  #define CMDQ_EOC_CMD		((u64)((CMDQ_CODE_EOC << CMDQ_OP_CODE_SHIFT)) \
>  				<< 32 | CMDQ_EOC_IRQ_EN)
> +#define CMDQ_REG_TYPE		1
>  
>  struct cmdq_instruction {
>  	union {
> @@ -23,8 +24,17 @@ struct cmdq_instruction {
>  	union {
>  		u16 offset;
>  		u16 event;
> +		u16 reg_dst;
> +	};
> +	union {
> +		u8 subsys;
> +		struct {
> +			u8 sop:5;
> +			u8 arg_c_t:1;
> +			u8 arg_b_t:1;
> +			u8 arg_a_t:1;
> +		};
>  	};
> -	u8 subsys;
>  	u8 op;
>  };
>  
> @@ -279,6 +289,18 @@ int cmdq_pkt_poll_mask(struct cmdq_pkt *pkt, u8 subsys,
>  }
>  EXPORT_SYMBOL(cmdq_pkt_poll_mask);
>  
> +int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value)
> +{
> +	struct cmdq_instruction inst = { {0} };
> +
> +	inst.op = CMDQ_CODE_LOGIC;
> +	inst.arg_a_t = CMDQ_REG_TYPE;

It looks like that arg_a_t could have a meaningful name.

Regards,
CK

> +	inst.reg_dst = reg_idx;
> +	inst.value = value;
> +	return cmdq_pkt_append_command(pkt, inst);
> +}
> +EXPORT_SYMBOL(cmdq_pkt_assign);
> +
>  static int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
>  {
>  	struct cmdq_client *cl = pkt->cl;
> diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
> index dfe5b2e..121c3bb 100644
> --- a/include/linux/mailbox/mtk-cmdq-mailbox.h
> +++ b/include/linux/mailbox/mtk-cmdq-mailbox.h
> @@ -59,6 +59,7 @@ enum cmdq_code {
>  	CMDQ_CODE_JUMP = 0x10,
>  	CMDQ_CODE_WFE = 0x20,
>  	CMDQ_CODE_EOC = 0x40,
> +	CMDQ_CODE_LOGIC = 0xa0,
>  };
>  
>  enum cmdq_cb_status {
> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> index a74c1d5..8334021 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -152,6 +152,20 @@ int cmdq_pkt_poll(struct cmdq_pkt *pkt, u8 subsys,
>   */
>  int cmdq_pkt_poll_mask(struct cmdq_pkt *pkt, u8 subsys,
>  		       u16 offset, u32 value, u32 mask);
> +
> +/**
> + * cmdq_pkt_assign() - Append logic assign command to the CMDQ packet, ask GCE
> + *		       to execute an instruction that set a constant value into
> + *		       internal register and use as value, mask or address in
> + *		       read/write instruction.
> + * @pkt:	the CMDQ packet
> + * @reg_idx:	the CMDQ internal register ID
> + * @value:	the specified value
> + *
> + * Return: 0 for success; else the error code is returned
> + */
> +int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value);
> +
>  /**
>   * cmdq_pkt_flush_async() - trigger CMDQ to asynchronously execute the CMDQ
>   *                          packet and call back at the end of done packet