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From: Guoniu Zhou <guoniu.zhou@nxp.com>
To: Rui Miguel Silva <rmfrfs@gmail.com>,
	 Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	 Martin Kepplinger <martink@posteo.de>,
	Purism Kernel Team <kernel@puri.sm>,
	 Mauro Carvalho Chehab <mchehab@kernel.org>,
	Rob Herring <robh@kernel.org>,
	 Krzysztof Kozlowski <krzk+dt@kernel.org>,
	 Conor Dooley <conor+dt@kernel.org>,
	Shawn Guo <shawnguo@kernel.org>,
	 Sascha Hauer <s.hauer@pengutronix.de>,
	 Pengutronix Kernel Team <kernel@pengutronix.de>,
	 Fabio Estevam <festevam@gmail.com>,
	Philipp Zabel <p.zabel@pengutronix.de>,
	 Frank Li <Frank.Li@nxp.com>
Cc: linux-media@vger.kernel.org, devicetree@vger.kernel.org,
	 imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
	 linux-kernel@vger.kernel.org, Guoniu Zhou <guoniu.zhou@nxp.com>
Subject: [PATCH v4 3/4] media: imx8mq-mipi-csi2: Explicitly release reset
Date: Thu, 28 Aug 2025 15:17:35 +0800	[thread overview]
Message-ID: <20250828-csi2_imx8ulp-v4-3-a2f97b15bb98@nxp.com> (raw)
In-Reply-To: <20250828-csi2_imx8ulp-v4-0-a2f97b15bb98@nxp.com>

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.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Guoniu Zhou <guoniu.zhou@nxp.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


  parent reply	other threads:[~2025-08-28  7:18 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-08-28  7:17 [PATCH v4 0/4] Add MIPI CSI-2 support for i.MX8ULP Guoniu Zhou
2025-08-28  7:17 ` [PATCH v4 1/4] media: dt-bindings: nxp,imx8mq-mipi-csi2: Add i.MX8ULP compatible string Guoniu Zhou
2025-08-29  7:33   ` Krzysztof Kozlowski
2025-08-28  7:17 ` [PATCH v4 2/4] media: imx8mq-mipi-csi2: Use devm_clk_bulk_get_all() to fetch clocks Guoniu Zhou
2025-08-28  7:17 ` Guoniu Zhou [this message]
2025-08-28  7:17 ` [PATCH v4 4/4] arm64: dts: imx8ulp: Add CSI and ISI Nodes Guoniu Zhou

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