linux-kernel - [PATCH 2/3] media: i2c: imx283: add support for non-continuous MIPI clock mode

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Message-Id: <20251217-imx283-ext-v1-2-906a762f592d@emfend.at>
Date: Wed, 17 Dec 2025 08:06:01 +0100
From: Matthias Fend <matthias.fend@...end.at>
To: Kieran Bingham <kieran.bingham@...asonboard.com>, 
 Umang Jain <uajain@...lia.com>, Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: linux-media@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Matthias Fend <matthias.fend@...end.at>
Subject: [PATCH 2/3] media: i2c: imx283: add support for non-continuous
 MIPI clock mode

Add support for selecting between continuous and non-continuous MIPI clock
mode.

Previously, the CSI-2 non-continuous clock endpoint flag was ignored and
the sensor was always configured for non-continuous clock mode. For
existing device tree nodes that do not have this property enabled, this
update will therefore change the actual clock mode.

Signed-off-by: Matthias Fend <matthias.fend@...end.at>
---
 drivers/media/i2c/imx283.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/media/i2c/imx283.c b/drivers/media/i2c/imx283.c
index 8ab63ad8f385f6e2a2d7432feff0af09a5356dc4..7a6ab2941ea985401b21d60163b58e980cf31ddc 100644
--- a/drivers/media/i2c/imx283.c
+++ b/drivers/media/i2c/imx283.c
@@ -149,6 +149,9 @@
 #define IMX283_REG_PLSTMG02		CCI_REG8(0x36aa)
 #define   IMX283_PLSTMG02_VAL		0x00
 
+#define IMX283_REG_MIPI_CLK		CCI_REG8(0x3a43)
+#define   IMX283_MIPI_CLK_NONCONTINUOUS	BIT(0)
+
 #define IMX283_REG_EBD_X_OUT_SIZE	CCI_REG16_LE(0x3a54)
 
 /* Test pattern generator */
@@ -565,6 +568,7 @@ struct imx283 {
 	struct v4l2_ctrl *hblank;
 	struct v4l2_ctrl *vflip;
 
+	bool mipi_clk_noncontinuous;
 	unsigned long link_freq_bitmap;
 
 	u16 hmax;
@@ -988,6 +992,7 @@ static int imx283_set_pad_format(struct v4l2_subdev *sd,
 static int imx283_standby_cancel(struct imx283 *imx283)
 {
 	unsigned int link_freq_idx;
+	u8 mipi_clk;
 	int ret = 0;
 
 	cci_write(imx283->cci, IMX283_REG_STANDBY,
@@ -1007,6 +1012,10 @@ static int imx283_standby_cancel(struct imx283 *imx283)
 	/* Enable PLL */
 	cci_write(imx283->cci, IMX283_REG_STBPL, IMX283_STBPL_NORMAL, &ret);
 
+	/* Configure MIPI clock mode */
+	mipi_clk = imx283->mipi_clk_noncontinuous ? IMX283_MIPI_CLK_NONCONTINUOUS : 0;
+	cci_write(imx283->cci, IMX283_REG_MIPI_CLK, mipi_clk, &ret);
+
 	/* Configure the MIPI link speed */
 	link_freq_idx = __ffs(imx283->link_freq_bitmap);
 	cci_multi_reg_write(imx283->cci, link_freq_reglist[link_freq_idx].regs,
@@ -1426,6 +1435,9 @@ static int imx283_parse_endpoint(struct imx283 *imx283)
 		goto done_endpoint_free;
 	}
 
+	imx283->mipi_clk_noncontinuous =
+		bus_cfg.bus.mipi_csi2.flags & V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
+
 	ret = v4l2_link_freq_to_bitmap(imx283->dev, bus_cfg.link_frequencies,
 				       bus_cfg.nr_of_link_frequencies,
 				       link_frequencies, ARRAY_SIZE(link_frequencies),

-- 
2.34.1