linux-kernel - [PATCH 07/13] media: i2c: Add vblank control to ov8865

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Date:   Thu, 22 Jul 2021 21:34:01 +0100
From:   Daniel Scally <djrscally@...il.com>
To:     Daniel Scally <djrscally@...il.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Yang Li <yang.lee@...ux.alibaba.com>,
        linux-media@...r.kernel.org (open list:MEDIA INPUT INFRASTRUCTURE
        (V4L/DVB)), linux-kernel@...r.kernel.org (open list)
Cc:     Yong Zhi <yong.zhi@...el.com>, Bingbu Cao <bingbu.cao@...el.com>,
        Tianshu Qiu <tian.shu.qiu@...el.com>,
        Colin Ian King <colin.king@...onical.com>,
        laurent.pinchart@...asonboard.com, kieran.bingham@...asonboard.com
Subject: [PATCH 07/13] media: i2c: Add vblank control to ov8865

Add a V4L2_CID_VBLANK control to the ov8865 driver.

Signed-off-by: Daniel Scally <djrscally@...il.com>
---
 drivers/media/i2c/ov8865.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/drivers/media/i2c/ov8865.c b/drivers/media/i2c/ov8865.c
index 09558a3342dd..daead1fc9314 100644
--- a/drivers/media/i2c/ov8865.c
+++ b/drivers/media/i2c/ov8865.c
@@ -183,6 +183,8 @@
 #define OV8865_VTS_H(v)				(((v) & GENMASK(11, 8)) >> 8)
 #define OV8865_VTS_L_REG			0x380f
 #define OV8865_VTS_L(v)				((v) & GENMASK(7, 0))
+#define OV8865_TIMING_MAX_VTS			0xffff
+#define OV8865_TIMING_MIN_VTS			0x04
 #define OV8865_OFFSET_X_H_REG			0x3810
 #define OV8865_OFFSET_X_H(v)			(((v) & GENMASK(15, 8)) >> 8)
 #define OV8865_OFFSET_X_L_REG			0x3811
@@ -658,6 +660,7 @@ struct ov8865_state {
 struct ov8865_ctrls {
 	struct v4l2_ctrl *link_freq;
 	struct v4l2_ctrl *pixel_rate;
+	struct v4l2_ctrl *vblank;
 
 	struct v4l2_ctrl_handler handler;
 };
@@ -2212,6 +2215,20 @@ static int ov8865_test_pattern_configure(struct ov8865_sensor *sensor,
 			    ov8865_test_pattern_bits[index]);
 }
 
+/* Blanking */
+
+static int ov8865_vts_configure(struct ov8865_sensor *sensor, u32 vblank)
+{
+	u16 vts = sensor->state.mode->output_size_y + vblank;
+	int ret;
+
+	ret = ov8865_write(sensor, OV8865_VTS_H_REG, OV8865_VTS_H(vts));
+	if (ret)
+		return ret;
+
+	return ov8865_write(sensor, OV8865_VTS_L_REG, OV8865_VTS_L(vts));
+}
+
 /* State */
 
 static int ov8865_state_mipi_configure(struct ov8865_sensor *sensor,
@@ -2463,6 +2480,8 @@ static int ov8865_s_ctrl(struct v4l2_ctrl *ctrl)
 	case V4L2_CID_TEST_PATTERN:
 		index = (unsigned int)ctrl->val;
 		return ov8865_test_pattern_configure(sensor, index);
+	case V4L2_CID_VBLANK:
+		return ov8865_vts_configure(sensor, ctrl->val);
 	default:
 		return -EINVAL;
 	}
@@ -2479,6 +2498,8 @@ static int ov8865_ctrls_init(struct ov8865_sensor *sensor)
 	struct ov8865_ctrls *ctrls = &sensor->ctrls;
 	struct v4l2_ctrl_handler *handler = &ctrls->handler;
 	const struct v4l2_ctrl_ops *ops = &ov8865_ctrl_ops;
+	const struct ov8865_mode *mode = sensor->state.mode;
+	unsigned int vblank_max, vblank_def;
 	int ret;
 
 	v4l2_ctrl_handler_init(handler, 32);
@@ -2514,6 +2535,13 @@ static int ov8865_ctrls_init(struct ov8865_sensor *sensor)
 				     ARRAY_SIZE(ov8865_test_pattern_menu) - 1,
 				     0, 0, ov8865_test_pattern_menu);
 
+	/* Blanking */
+	vblank_max = OV8865_TIMING_MAX_VTS - mode->output_size_y;
+	vblank_def = mode->vts - mode->output_size_y;
+	ctrls->vblank = v4l2_ctrl_new_std(handler, ops, V4L2_CID_VBLANK,
+					  OV8865_TIMING_MIN_VTS, vblank_max, 1,
+					  vblank_def);
+
 	/* MIPI CSI-2 */
 
 	ctrls->link_freq =
@@ -2694,6 +2722,10 @@ static int ov8865_set_fmt(struct v4l2_subdev *subdev,
 		 sensor->state.mbus_code != mbus_code)
 		ret = ov8865_state_configure(sensor, mode, mbus_code);
 
+	__v4l2_ctrl_modify_range(sensor->ctrls.vblank, OV8865_TIMING_MIN_VTS,
+				 OV8865_TIMING_MAX_VTS - mode->output_size_y,
+				 1, mode->vts - mode->output_size_y);
+
 complete:
 	mutex_unlock(&sensor->mutex);
 
@@ -3019,6 +3051,8 @@ static int ov8865_probe(struct i2c_client *client)
 
 	/* Sensor */
 
+	sensor->state.mode =  &ov8865_modes[0];
+
 	ret = ov8865_ctrls_init(sensor);
 	if (ret)
 		goto error_mutex;
-- 
2.25.1