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Thu, 13 Mar 2025 08:46:52 -0700 (PDT) Date: Thu, 13 Mar 2025 09:46:50 -0600 From: Mathieu Poirier To: Daniel Baluta Cc: p.zabel@pengutronix.de, robh@kernel.org, krzk+dt@kernel.org, shawnguo@kernel.org, devicetree@vger.kernel.org, linux-remoteproc@vger.kernel.org, conor+dt@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, linux-kernel@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, andersson@kernel.org, Frank.Li@nxp.com, peng.fan@nxp.com, laurentiu.mihalcea@nxp.com, iuliana.prodan@nxp.com, shengjiu.wang@nxp.com Subject: Re: [PATCH v5 0/8] imx8mp: Add support to Run/Stall DSP via reset API Message-ID: References: <20250311085812.1296243-1-daniel.baluta@nxp.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250311085812.1296243-1-daniel.baluta@nxp.com> On Tue, Mar 11, 2025 at 10:58:03AM +0200, Daniel Baluta wrote: > This patch series adds support to control the Run/Stall DSP bits found on > i.MX8MP via the reset controller API instead of using the syscon API. > > DSP found on i.MX8MP doesn't have a direct reset line so according to hardware > design team in order to handle assert/deassert/reset functionality we > need to use a combination of control bits from two modules. > > Audio block control module: > - for Run/Stall control bits of the DSP > > Debug Access Port (DAP) > - for Software Reset via IMX8M_DAP_PWRCTL register > > The current implementation for IMX DSP Remotproc driver and for Sound Open > Firmware driver (already upstream) uses the following approach: > - maps the Audio Block Control address via syscon API through > the fsl,dsp-ctrl property of the dsp node. > - maps the DAP address space using directly a call to ioremap > with IMX8M_DAP_DEBUG macro depicting the DAP base address. > > The both approaches are problematic when comes to describing the address > spaces via the DT: > - for Audio Block Control, because it uses the syscon interface > - for DAP because it hardcodes de base address instead of using a dt node. > > This patch series aims to fix the Audio Block control usage of the > syscon interface and replace it with Reset Controller interface. > > Main advantages of using the Reset Controller API is that we stop > abusing the syscon interface, offer a better probe ordering, PM runtime > support. Main critique of using the Reset Controller API is that > Run/Stall bits are not reset bits (but according the hardware design > team they are part of the reset proccess since there is no real reset > line). > > Initial discussion is here: > https://patchwork.kernel.org/project/imx/patch/20250212085222.107102-6-daniel.baluta@nxp.com/ > > Note that we can safely remove the fsl,dsp-ctrl property usage from IMX DSP > remoteproc driver because there is no Device Tree users. > > Changes since v4: > https://lore.kernel.org/lkml/20250305100037.373782-3-daniel.baluta@nxp.com/T/ > - picked-up R-b tags from Frank Li and Peng Fan > - reworded commit message of patch 8/8 as per Mathieu Poirier suggestion > > Changes since v3: > https://lore.kernel.org/linux-arm-kernel/20250225102005.408773-5-daniel.baluta@nxp.com/T/ > - renamed resets ids as per Philipp comments > - add boths resets (named them runstall and softreset) as per Philipp comments > > Changes since v2: > (https://lore.kernel.org/lkml/Z7ZNngd3wtJ5MZgl@lizhi-Precision-Tower-5810/T/) > - picked R-b and A-b tags > - use run_stall instead of reset to refer to reset controller > instance > - remove 'resets' description as it is a common property > - add correct include in the yaml dts snippet example > Changes since v1: > (https://lore.kernel.org/imx/20250219030809.GD6537@nxa18884-linux/T/) > - addresed comments received on v1 > - picked up R-b and A-b tags > > Daniel Baluta (8): > dt-bindings: reset: audiomix: Add reset ids for EARC and DSP > dt-bindings: dsp: fsl,dsp: Add resets property > arm64: dts: imx8mp: Use resets property > reset: imx8mp-audiomix: Add prefix for internal macro > reset: imx8mp-audiomix: Prepare the code for more reset bits > reset: imx8mp-audiomix: Introduce active_low configuration option > reset: imx8mp-audiomix: Add support for DSP run/stall > imx_dsp_rproc: Use reset controller API to control the DSP > > .../devicetree/bindings/dsp/fsl,dsp.yaml | 24 +++++- > arch/arm64/boot/dts/freescale/imx8mp.dtsi | 3 + > drivers/remoteproc/imx_dsp_rproc.c | 25 ++++-- > drivers/remoteproc/imx_rproc.h | 2 + > drivers/reset/reset-imx8mp-audiomix.c | 78 +++++++++++++------ > .../dt-bindings/reset/imx8mp-reset-audiomix.h | 13 ++++ > 6 files changed, 114 insertions(+), 31 deletions(-) > create mode 100644 include/dt-bindings/reset/imx8mp-reset-audiomix.h Other than patch 3 for which I haven't received a Reviewed-by, I have applied this set. Thanks, Mathieu > > -- > 2.43.0 >