linux-kernel - Re: [PATCH v4 2/6] remoteproc/mediatek: add SCP support for mt8183

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Date:   Wed, 13 Feb 2019 11:20:18 +0800
From:   Pi-Hsun Shih <pihsun@...omium.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Erin Lo <erin.lo@...iatek.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:REMOTE PROCESSOR (REMOTEPROC) SUBSYSTEM" 
        <linux-remoteproc@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v4 2/6] remoteproc/mediatek: add SCP support for mt8183

Hi,

Thanks for the review, would address most comments in next version of patch.

On Sat, Feb 2, 2019 at 8:17 AM Matthias Kaehlcke <mka@...omium.org> wrote:
>
> Hi Pi-Hsun,
>
> a few comments inline.
>
> It's the first time I dabble into remoteproc, I don't claim to have a
> complete understanding of the driver at this point ;-)
>
> On Thu, Jan 31, 2019 at 05:31:27PM +0800, Pi-Hsun Shih wrote:
> > diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> > new file mode 100644
> > index 00000000000000..920c81c3525c2a
> > --- /dev/null
> > +++ b/drivers/remoteproc/mtk_scp.c
> > +             return ret;
> > +     }
> > +
> > +     writel(0x0, scp->reg_base + MT8183_SCP_SRAM_PDN);
>
> what is the purpose of this write?
>

Answer from Erin:
The code needs to execute on scp’s SRAM.
We need to turn on the power of SRAM before using it.