linux-kernel - Re: [PATCH v2] bus: imx-aipstz: set default value for opacr registers

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Message-ID: <edd0b5a9-41c4-41f2-9785-04236987fc93@oss.nxp.com>
Date: Mon, 26 Jan 2026 16:47:44 +0200
From: Daniel Baluta <daniel.baluta@....nxp.com>
To: 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,
 shengjiu.wang@...il.com
Subject: Re: [PATCH v2] bus: imx-aipstz: set default value for opacr registers

On 1/26/26 11:11, Shengjiu Wang wrote:
> The sdma script app_2_mcu needs the permission to access the peripheral
> devices:
>
> 1) SDMA2 transactions are set to user-mode in this particular case.
> 2) This type of script doesn't use the peripheral interface (connected
> directly to SPBA), but it uses the peripheral DMA interface, then the
> SDMA2-issued transactions are subjected to AIPSTZ5's security-related
> checks.
>
> 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 aips bus,
> so set default value (zero) for all opacr registers.
>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>

Reviewed-by: Daniel Baluta <daniel.baluta@....com>