linux-kernel - Re: [PATCH 5/5] imx_dsp_rproc: Use reset controller API to control the DSP

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Message-ID: <50c7055a676fb7f1bf27cb33a914df641c56dd15.camel@pengutronix.de>
Date: Tue, 18 Feb 2025 10:35:53 +0100
From: Philipp Zabel <p.zabel@...gutronix.de>
To: Daniel Baluta <daniel.baluta@....com>, shawnguo@...nel.org, 
	mathieu.poirier@...aro.org
Cc: s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com, 
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, andersson@...nel.org, 
	linux-remoteproc@...r.kernel.org, iuliana.prodan@....com, 
	laurentiu.mihalcea@....com, shengjiu.wang@....com, Frank.Li@....com, 
	krzk@...nel.org
Subject: Re: [PATCH 5/5] imx_dsp_rproc: Use reset controller API to control
 the DSP

On Di, 2025-02-18 at 10:57 +0200, Daniel Baluta wrote:
> Use the reset controller API to control the DSP on i.MX8MP. This way
> we can have a better control of the resources and avoid using a syscon
> to access the audiomix bits.
> 
> Signed-off-by: Daniel Baluta <daniel.baluta@....com>
> ---
>  drivers/remoteproc/imx_dsp_rproc.c | 25 +++++++++++++++++--------
>  drivers/remoteproc/imx_rproc.h     |  2 ++
>  2 files changed, 19 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/remoteproc/imx_dsp_rproc.c b/drivers/remoteproc/imx_dsp_rproc.c
> index ea5024919c2f..2b97e4d0bb9e 100644
> --- a/drivers/remoteproc/imx_dsp_rproc.c
> +++ b/drivers/remoteproc/imx_dsp_rproc.c
> @@ -19,6 +19,7 @@
>  #include <linux/pm_runtime.h>
>  #include <linux/regmap.h>
>  #include <linux/remoteproc.h>
> +#include <linux/reset.h>
>  #include <linux/slab.h>
>  
>  #include "imx_rproc.h"
> @@ -111,6 +112,7 @@ enum imx_dsp_rp_mbox_messages {
>   */
>  struct imx_dsp_rproc {
>  	struct regmap				*regmap;
> +	struct reset_control			*reset;
>  	struct rproc				*rproc;
>  	const struct imx_dsp_rproc_dcfg		*dsp_dcfg;
>  	struct clk_bulk_data			clks[DSP_RPROC_CLK_MAX];
> @@ -192,9 +194,7 @@ static int imx8mp_dsp_reset(struct imx_dsp_rproc *priv)
>  	/* Keep reset asserted for 10 cycles */
>  	usleep_range(1, 2);
>  
> -	regmap_update_bits(priv->regmap, IMX8M_AudioDSP_REG2,
> -			   IMX8M_AudioDSP_REG2_RUNSTALL,
> -			   IMX8M_AudioDSP_REG2_RUNSTALL);
> +	reset_control_assert(priv->reset);
>  
>  	/* Take the DSP out of reset and keep stalled for FW loading */
>  	pwrctl = readl(dap + IMX8M_DAP_PWRCTL);
> @@ -231,13 +231,9 @@ static int imx8ulp_dsp_reset(struct imx_dsp_rproc *priv)
>  
>  /* Specific configuration for i.MX8MP */
>  static const struct imx_rproc_dcfg dsp_rproc_cfg_imx8mp = {
> -	.src_reg	= IMX8M_AudioDSP_REG2,
> -	.src_mask	= IMX8M_AudioDSP_REG2_RUNSTALL,
> -	.src_start	= 0,
> -	.src_stop	= IMX8M_AudioDSP_REG2_RUNSTALL,
>  	.att		= imx_dsp_rproc_att_imx8mp,
>  	.att_size	= ARRAY_SIZE(imx_dsp_rproc_att_imx8mp),
> -	.method		= IMX_RPROC_MMIO,
> +	.method		= IMX_RPROC_RESET_CONTROLLER,
>  };
>  
>  static const struct imx_dsp_rproc_dcfg imx_dsp_rproc_cfg_imx8mp = {
> @@ -329,6 +325,9 @@ static int imx_dsp_rproc_start(struct rproc *rproc)
>  					  true,
>  					  rproc->bootaddr);
>  		break;
> +	case IMX_RPROC_RESET_CONTROLLER:
> +		ret = reset_control_deassert(priv->reset);
> +		break;
>  	default:
>  		return -EOPNOTSUPP;
>  	}
> @@ -369,6 +368,9 @@ static int imx_dsp_rproc_stop(struct rproc *rproc)
>  					  false,
>  					  rproc->bootaddr);
>  		break;
> +	case IMX_RPROC_RESET_CONTROLLER:
> +		ret = reset_control_assert(priv->reset);
> +		break;
>  	default:
>  		return -EOPNOTSUPP;
>  	}
> @@ -995,6 +997,13 @@ static int imx_dsp_rproc_detect_mode(struct imx_dsp_rproc *priv)
>  
>  		priv->regmap = regmap;
>  		break;
> +	case IMX_RPROC_RESET_CONTROLLER:
> +		priv->reset = devm_reset_control_get_optional_exclusive(dev, NULL);

Is this optional on purpose? There is no mention of it in the commit
message. Where is this resets property documented in the dt-bindings?

regards
Philipp