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Mon, 26 Jan 2026 07:22:51 -0800 (PST) Message-ID: Date: Mon, 26 Jan 2026 07:22:54 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] bus: imx-aipstz: set default value for opacr registers To: Shengjiu Wang , shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, laurentiu.mihalcea@nxp.com, daniel.baluta@nxp.com, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, shengjiu.wang@gmail.com References: <20260126091156.951052-1-shengjiu.wang@nxp.com> Content-Language: en-US From: Laurentiu Mihalcea In-Reply-To: <20260126091156.951052-1-shengjiu.wang@nxp.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 1/26/2026 1:11 AM, 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 Reviewed-by: Laurentiu Mihalcea