linux-kernel - Re: [PATCH v6 08/12] soc: mediatek: cmdq: define the instruction struct

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Date:   Fri, 17 May 2019 11:32:39 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Bibby Hsieh <bibby.hsieh@...iatek.com>
CC:     Jassi Brar <jassisinghbrar@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Daniel Kurtz <djkurtz@...omium.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>,
        Sascha Hauer <kernel@...gutronix.de>,
        "Philipp Zabel" <p.zabel@...gutronix.de>,
        Nicolas Boichat <drinkcat@...omium.org>,
        "YT Shen" <yt.shen@...iatek.com>,
        Daoyuan Huang <daoyuan.huang@...iatek.com>,
        Jiaguang Zhang <jiaguang.zhang@...iatek.com>,
        Dennis-YC Hsieh 
        <dennis-yc.hsimediatek/mtkcam/drv/fdvt/4.0/cam_fdvt_v4l2.cppeh@...iatek.com>,
        Houlong Wei <houlong.wei@...iatek.com>,
        <ginny.chen@...iatek.com>
Subject: Re: [PATCH v6 08/12] soc: mediatek: cmdq: define the instruction
 struct

Hi, Bibby:

On Thu, 2019-05-16 at 17:02 +0800, Bibby Hsieh wrote:
> Define a instruction structure for gce driver to append command.
> This structure can make the client's code more readability.
> 
> Signed-off-by: Bibby Hsieh <bibby.hsieh@...iatek.com>
> ---
>  drivers/soc/mediatek/mtk-cmdq-helper.c   | 113 +++++++++++++++--------
>  include/linux/mailbox/mtk-cmdq-mailbox.h |   2 +
>  include/linux/soc/mediatek/mtk-cmdq.h    |  14 +--
>  3 files changed, 84 insertions(+), 45 deletions(-)
> 

[snip]

>  
>  /**
>   * cmdq_pkt_write_mask() - append write command with mask to the CMDQ packet
>   * @pkt:	the CMDQ packet
> - * @value:	the specified target register value
>   * @subsys:	the CMDQ sub system code
>   * @offset:	register offset from CMDQ sub system
> + * @value:	the specified target register value
>   * @mask:	the specified target register mask
>   *
>   * Return: 0 for success; else the error code is returned
>   */
> -int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u32 value,
> -			u32 subsys, u32 offset, u32 mask);
> +int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys, u16 offset,
> +			u32 value, u32 mask);

You have do two things for this interface: one is reordering the
parameter, another one is changing type of subsys from u32 to u8.

Define the instruction struct is not necessary to change the order and
type. I would like you to separate these two things to another patches.
So the patch sequence may be:

1. Reorder parameter of cmdq_pkt_write_mask()
2. Change subsys type to u8
3. define the instruction struct

Regards,
CK

>  
>  /**
>   * cmdq_pkt_wfe() - append wait for event command to the CMDQ packet
> @@ -88,7 +88,7 @@ int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u32 value,
>   *
>   * Return: 0 for success; else the error code is returned
>   */
> -int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u32 event);
> +int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event);
>  
>  /**
>   * cmdq_pkt_clear_event() - append clear event command to the CMDQ packet
> @@ -97,7 +97,7 @@ int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u32 event);
>   *
>   * Return: 0 for success; else the error code is returned
>   */
> -int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u32 event);
> +int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u16 event);
>  
>  /**
>   * cmdq_pkt_flush_async() - trigger CMDQ to asynchronously execute the CMDQ