linux-kernel - [PATCH v2 3/4] media: i2c: ov5640: Add support for BT656 mode

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Date:   Mon,  3 Aug 2020 15:31:46 +0100
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Jacopo Mondi <jacopo@...ndi.org>,
        Steve Longerbeam <slongerbeam@...il.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hugues Fruchet <hugues.fruchet@...com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-media@...r.kernel.org
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Biju Das <biju.das.jz@...renesas.com>,
        Prabhakar <prabhakar.csengg@...il.com>,
        linux-renesas-soc@...r.kernel.org,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH v2 3/4] media: i2c: ov5640: Add support for BT656 mode

Enable support for BT656 mode.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
---
 drivers/media/i2c/ov5640.c | 40 +++++++++++++++++++++++++++-----------
 1 file changed, 29 insertions(+), 11 deletions(-)

diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
index ec444bee2ce9..08c67250042f 100644
--- a/drivers/media/i2c/ov5640.c
+++ b/drivers/media/i2c/ov5640.c
@@ -82,6 +82,7 @@
 #define OV5640_REG_VFIFO_HSIZE		0x4602
 #define OV5640_REG_VFIFO_VSIZE		0x4604
 #define OV5640_REG_JPG_MODE_SELECT	0x4713
+#define OV5640_REG_CCIR656_CTRL00	0x4730
 #define OV5640_REG_POLARITY_CTRL00	0x4740
 #define OV5640_REG_MIPI_CTRL00		0x4800
 #define OV5640_REG_DEBUG_MODE		0x4814
@@ -1216,6 +1217,18 @@ static int ov5640_set_autogain(struct ov5640_dev *sensor, bool on)
 			      BIT(1), on ? 0 : BIT(1));
 }
 
+static int ov5640_set_stream_bt656(struct ov5640_dev *sensor, bool on)
+{
+	int ret;
+
+	ret = ov5640_write_reg(sensor, OV5640_REG_CCIR656_CTRL00, on ? 0x1 : 0x00);
+	if (ret)
+		return ret;
+
+	return ov5640_write_reg(sensor, OV5640_REG_SYS_CTRL0, on ?
+				OV5640_SOFTWARE_WAKEUP : OV5640_SOFTWARE_PWDN);
+}
+
 static int ov5640_set_stream_dvp(struct ov5640_dev *sensor, bool on)
 {
 	return ov5640_write_reg(sensor, OV5640_REG_SYS_CTRL0, on ?
@@ -2022,18 +2035,20 @@ static int ov5640_set_dvp(struct ov5640_dev *sensor, bool on)
 	 *		datasheet and hardware, 0 is active high
 	 *		and 1 is active low...)
 	 */
-	if (flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
-		pclk_pol = 1;
-	if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
-		hsync_pol = 1;
-	if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
-		vsync_pol = 1;
+	if (sensor->ep.bus_type == V4L2_MBUS_PARALLEL) {
+		if (flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
+			pclk_pol = 1;
+		if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
+			hsync_pol = 1;
+		if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
+			vsync_pol = 1;
 
-	ret = ov5640_write_reg(sensor, OV5640_REG_POLARITY_CTRL00,
-			       (pclk_pol << 5) | (hsync_pol << 1) | vsync_pol);
+		ret = ov5640_write_reg(sensor, OV5640_REG_POLARITY_CTRL00,
+				       (pclk_pol << 5) | (hsync_pol << 1) | vsync_pol);
 
-	if (ret)
-		return ret;
+		if (ret)
+			return ret;
+	}
 
 	/*
 	 * powerdown MIPI TX/RX PHY & disable MIPI
@@ -2057,7 +2072,8 @@ static int ov5640_set_dvp(struct ov5640_dev *sensor, bool on)
 	 * - 4:		PCLK output enable
 	 * - [3:0]:	D[9:6] output enable
 	 */
-	ret = ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT_ENABLE01, 0x7f);
+	ret = ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT_ENABLE01,
+			       sensor->ep.bus_type == V4L2_MBUS_PARALLEL ? 0x7f : 0x1f);
 	if (ret)
 		return ret;
 
@@ -2911,6 +2927,8 @@ static int ov5640_s_stream(struct v4l2_subdev *sd, int enable)
 
 		if (sensor->ep.bus_type == V4L2_MBUS_CSI2_DPHY)
 			ret = ov5640_set_stream_mipi(sensor, enable);
+		else if (sensor->ep.bus_type == V4L2_MBUS_BT656)
+			ret = ov5640_set_stream_bt656(sensor, enable);
 		else
 			ret = ov5640_set_stream_dvp(sensor, enable);
 
-- 
2.17.1