linux-kernel - Re: [PATCH v2 3/4] media: imx8mq-mipi-csi2: Explicitly release reset

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Message-ID: <aKh5hsbbGjmKrnxx@lizhi-Precision-Tower-5810>
Date: Fri, 22 Aug 2025 10:07:02 -0400
From: Frank Li <Frank.li@....com>
To: Guoniu Zhou <guoniu.zhou@....com>
Cc: Rui Miguel Silva <rmfrfs@...il.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Martin Kepplinger <martink@...teo.de>,
	Purism Kernel Team <kernel@...i.sm>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Philipp Zabel <p.zabel@...gutronix.de>, linux-media@...r.kernel.org,
	devicetree@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] media: imx8mq-mipi-csi2: Explicitly release reset

On Fri, Aug 22, 2025 at 06:50:14PM +0800, Guoniu Zhou wrote:
> Call reset_control_deassert() to explicitly release reset to make sure
> reset bits are cleared since platform like i.MX8ULP can't clear reset
> bits automatically.
>
> Signed-off-by: Guoniu Zhou <guoniu.zhou@....com>
> ---

Reviewed-by: Frank Li <Frank.Li@....com>

>  drivers/media/platform/nxp/imx8mq-mipi-csi2.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/media/platform/nxp/imx8mq-mipi-csi2.c b/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
> index 2bf11984690af2e687a3217e465697333d9d995d..6b83aa85af42e1dac25cf29056863680c1f89402 100644
> --- a/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
> +++ b/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
> @@ -337,18 +337,14 @@ static int imx8mq_mipi_csi_sw_reset(struct csi_state *state)
>  {
>  	int ret;
>
> -	/*
> -	 * these are most likely self-clearing reset bits. to make it
> -	 * more clear, the reset-imx7 driver should implement the
> -	 * .reset() operation.
> -	 */
>  	ret = reset_control_assert(state->rst);
>  	if (ret < 0) {
>  		dev_err(state->dev, "Failed to assert resets: %d\n", ret);
>  		return ret;
>  	}
>
> -	return 0;
> +	/* Explicitly release reset to make sure reset bits are cleared. */
> +	return reset_control_deassert(state->rst);
>  }
>
>  static void imx8mq_mipi_csi_set_params(struct csi_state *state)
>
> --
> 2.34.1
>