linux-kernel - Re: [PATCH 07/15] mailbox: mediatek: Add loop pkt flag and irq handling for loop command

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Date:   Tue, 26 Sep 2023 03:20:19 +0000
From:   Jason-JH Lin (林睿祥) 
        <Jason-JH.Lin@...iatek.com>
To:     "jassisinghbrar@...il.com" <jassisinghbrar@...il.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Singo Chang (張興國) 
        <Singo.Chang@...iatek.com>,
        Johnson Wang (王聖鑫) 
        <Johnson.Wang@...iatek.com>,
        Jason-ch Chen (陳建豪) 
        <Jason-ch.Chen@...iatek.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Shawn Sung (宋孝謙) 
        <Shawn.Sung@...iatek.com>,
        Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Elvis Wang (王军) <Elvis.Wang@...iatek.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH 07/15] mailbox: mediatek: Add loop pkt flag and irq
 handling for loop command

On Mon, 2023-09-25 at 08:44 +0200, Krzysztof Kozlowski wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  On 25/09/2023 07:21, Jason-JH Lin (林睿祥) wrote:
> > Hi Krzysztof,
> > 
> > Thanks for the reviews.
> > 
> > On Sat, 2023-09-23 at 20:03 +0200, Krzysztof Kozlowski wrote:
> >>   
> >> External email : Please do not click links or open attachments
> until
> >> you have verified the sender or the content.
> >>  On 18/09/2023 21:21, Jason-JH.Lin wrote:
> >>> CMDQ client can use a loop flag for the CMDQ packet to make
> current
> >>> command buffer jumps to the beginning when GCE executes to the
> end
> >>> of commands buffer.
> >>>
> >>> GCE irq occurs when GCE executes to the end of command
> instruction.
> >>> If the CMDQ packet is a loopping command, GCE irq handler can not
> >>> delete the CMDQ task and disable the GCE thread.
> >>>
> >>> Add cmdq_mbox_stop to support thread disable
> >>
> >> How or where do you add it? I do not see it in this patch. Your
> >> patchset
> >> looks randomly organized.
> > 
> > This will be used in cmdq_pkt_finialize_loop() at [PATCH 8/15].
> > 
> > mtk-cmdq-helper.c and mtk-cmdq-mailbox.c are not in the
> > same maintainer's tree, so I separate this to another patch from
> [PATCH
> > 8/15].
> 
> Why? Anyway it has to go through same tree. You have dependencies.
> Such
> artificial split makes it only difficult to review and understand.
> Re-organize your patchset to be correctly split per each logical
> feature/change. Split per subsystems is not the same.
> 

Yes, these related files are in the different maintainer's tree.
Refer to https://www.kernel.org/doc/linux/MAINTAINERS

MAILBOX API
M: Jassi Brar
F: drivers/mailbox/
- drivers/mailbox/mtk-cmdq-mailbox.c
- drivers/mailbox/mtk-cmdq-sec-
mailbox.c

ARM/Mediatek SoC support
M: Matthias Brugger
F: drivers/soc/mediatek/
K: mediatek
- drivers/soc/mediatek/mtk-cmdq-helper.c
-
include/linux/soc/mediatek/mtk-cmdq.h

I think we should add a new MAINTAINER label for mediatek CMDQ mailbox
and put these files together, such as "MAILBOX ARM MHUv2" and "QUALCOM
IPCC MAILBOX DRIVER".
But I don't know how to make a request for that.

Anyway, I'll squash this logical feature to the same patch, no matter
these files are not in the same tree.

Regards,
Jason-JH.Lin

> Best regards,
> Krzysztof
>