linux-kernel - Re: [PATCH] bus: imx-aipstz: set default value for opacr registers

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Message-ID: <CAA+D8AOHwNPRwdz+M_o14cBgwh1iRfJ6JA4t1yewWSbxdfJhdA@mail.gmail.com>
Date: Mon, 26 Jan 2026 10:40:05 +0800
From: Shengjiu Wang <shengjiu.wang@...il.com>
To: Laurentiu Mihalcea <laurentiumihalcea111@...il.com>
Cc: Shengjiu Wang <shengjiu.wang@....com>, shawnguo@...nel.org, s.hauer@...gutronix.de, 
	kernel@...gutronix.de, festevam@...il.com, laurentiu.mihalcea@....com, 
	daniel.baluta@....com, imx@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bus: imx-aipstz: set default value for opacr registers

On Fri, Jan 23, 2026 at 6:08 PM Laurentiu Mihalcea
<laurentiumihalcea111@...il.com> wrote:
>
>
> On 1/23/2026 12:48 AM, Shengjiu Wang wrote:
> > The sdma script app_2_mcu needs the permission to access the peripheral
> > devices, so need to clear the Supervisor Protect bit of SPBA2, otherwise
> > the sdma script can't work.
> >
> > As the imx-aipstz is a common driver for all apis bus, so set default
> > value for all opacr registers, that the peripheral does not require
> > supervisor privilege level for accesses.
> >
> > Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> > ---
> >  drivers/bus/imx-aipstz.c | 20 ++++++++++++++++++++
> >  1 file changed, 20 insertions(+)
>
>
> Hey SJ,
>
>
> I'd be interested in explaining the situation a bit better in the commit message.
>
> The 2 most important pieces of information are, in my opinion:
>
>
> 1) SDMA2 transactions are set to user-mode in your particular case.
>
> 2) Your script doesn't use the peripheral interface (connected directly
>
> to SPBA), which is why the SDMA2-issued transactions are subjected to
>
> AIPSTZ5's security-related checks.

Thanks, will update them to commit message.

best regards
Shengjiu Wang
>
>
> Of course, please feel free to correct me if I got something wrong.
>
>
> Thanks,
>
> Laurentiu
>