linux-kernel - Re: [PATCH v1 05/15] remoteproc: mediatek: Add SCP core 1 driver for dual-core scp

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Date:   Mon, 6 Jun 2022 18:41:17 +0800
From:   Tinghan Shen <tinghan.shen@...iatek.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        Daisuke Nojiri <dnojiri@...omium.org>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        "Dustin L. Howett" <dustin@...ett.net>,
        Tzung-Bi Shih <tzungbi@...nel.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Prashant Malani <pmalani@...omium.org>,
        "Brian Norris" <briannorris@...omium.org>
CC:     <linux-remoteproc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <chrome-platform@...ts.linux.dev>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        <weishunc@...gle.com>
Subject: Re: [PATCH v1 05/15] remoteproc: mediatek: Add SCP core 1 driver
 for dual-core scp

On Mon, 2022-06-06 at 12:08 +0200, AngeloGioacchino Del Regno wrote:
> Il 06/06/22 11:52, Tinghan Shen ha scritto:
> > On Mon, 2022-06-06 at 11:15 +0200, AngeloGioacchino Del Regno wrote:
> > > Il 01/06/22 13:21, Tinghan Shen ha scritto:
> > > > MT8195 SCP is a dual-core processor. The mtk_scp.c driver only controls
> > > > SCP core 0. This patch adds a basic driver to control the another core.
> > > > 
> > > > Core 1 and core 0 of the SCP are housed in the same subsys.They see
> > > > registers and memory in the same way.
> > > > 
> > > > Core 1 of the SCP features its own set of core configuration registers,
> > > > interrupt controller, timers, and DMAs. The rest of the peripherals
> > > > in this subsystem are shared by core 0 and core 1.
> > > > 
> > > > As for memory, core 1 has its own cache memory, and the SCP SRAM is shared
> > > > by core 0 and core 1.
> > > > 
> > > 
> > > Hello Tinghan,
> > > 
> > > checking all the patches that are introducing support for the secondary SCP core,
> > > it's clear that you're practically reusing *most of* mtk_scp in mtk_scp_dual.
> > > 
> > > I don't think that adding a new configuration option for MTK_SCP_DUALCORE (nor a
> > > new file just for that) is a good idea... the code is "short enough" so you should
> > > really just add support for multi-core SCP in mtk_scp.c instead.
> > > 
> > > After doing so, I have a hunch that we'll be able to reduce the size of this
> > > implementation even more, as I see literally too much common code :-)
> > > 
> > 
> > Hi Angelo,
> > 
> > Thanks for your review.
> > 
> > This series has 2 new files, mtk_scp_dual.c and mtk_scp_subdev.c.
> > Is your advice to merge both files into mtk_scp.c,
> > or to merely merge mtk_scp_dual.c to mtk_scp.c?
> > 
> > Thanks,
> > TingHan
> > 
> > 
> > 
> 
> I suggest to merge both into mtk_scp.c and commonize/generalize functions inside
> of there as much as possible... including the removal of #if IS_ENABLED(...)
> macro usages, as you can simply check that during runtime by setting a bool
> variable to true when it's dual-core.
> 
> Let's do this first step.
> I'll give you a more exhaustive review on v2, when this main step is done.
> 
> Cheers,
> Angelo

Hi Angelo,

Ok, I'll merge these files and send next version.


Thanks,
TingHan