linux-kernel - Re: [PATCH v4 02/13] mailbox: cmdq: variablize address shift in platform

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Date:   Wed, 4 Mar 2020 10:32:50 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Dennis YC Hsieh <dennis-yc.hsieh@...iatek.com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "David Airlie" <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <wsd_upstream@...iatek.com>, <dri-devel@...ts.freedesktop.org>,
        Bibby Hsieh <bibby.hsieh@...iatek.com>,
        Houlong Wei <houlong.wei@...iatek.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        HS Liao <hs.liao@...iatek.com>
Subject: Re: [PATCH v4 02/13] mailbox: cmdq: variablize address shift in
 platform

Hi, Dennis:

On Tue, 2020-03-03 at 18:58 +0800, Dennis YC Hsieh wrote:
> Some gce hardware shift pc and end address in register to support
> large dram addressing.
> Implement gce address shift when write or read pc and end register.
> And add shift bit in platform definition.
> 
> Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@...iatek.com>
> ---
>  drivers/mailbox/mtk-cmdq-mailbox.c       | 61 ++++++++++++++++++------
>  drivers/soc/mediatek/mtk-cmdq-helper.c   |  3 +-
>  include/linux/mailbox/mtk-cmdq-mailbox.h |  2 +
>  3 files changed, 50 insertions(+), 16 deletions(-)
> 

[snip]

>  
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index de20e6cba83b..2e1bc513569b 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -291,7 +291,8 @@ static int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
>  
>  	/* JUMP to end */
>  	inst.op = CMDQ_CODE_JUMP;
> -	inst.value = CMDQ_JUMP_PASS;
> +	inst.value = CMDQ_JUMP_PASS >>
> +		cmdq_mbox_shift(((struct cmdq_client *)pkt->cl)->chan);

Why not just cmdq_mbox_shift(pkt->cl->chan) ?

Regards,
CK

>  	err = cmdq_pkt_append_command(pkt, inst);
>  
>  	return err;
> diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
> index a4dc45fbec0a..dfe5b2eb85cc 100644
> --- a/include/linux/mailbox/mtk-cmdq-mailbox.h
> +++ b/include/linux/mailbox/mtk-cmdq-mailbox.h
> @@ -88,4 +88,6 @@ struct cmdq_pkt {
>  	void			*cl;
>  };
>  
> +u8 cmdq_mbox_shift(struct mbox_chan *chan);
> +
>  #endif /* __MTK_CMDQ_MAILBOX_H__ */