openwrt/target/linux/bcm27xx/patches-5.4/950-0797-media-i2c-ov6650-Use-new-get-set-_mbus_config-ops.patch

From 0dd7e12bb7dc81e09440f3330465c31349497dc3 Mon Sep 17 00:00:00 2001
From: Jacopo Mondi <jacopo+renesas@jmondi.org>
Date: Tue, 16 Jun 2020 16:12:38 +0200
Subject: [PATCH]_mbus_config
 ops

Upstream https://patchwork.linuxtv.org/patch/64674/

Use the new get_mbus_config and set_mbus_config pad operations in place
of the video operations currently in use.

Compared to other drivers where the same conversion has been performed,
ov6650 proved to be a bit more tricky, as the existing g_mbus_config
implementation did not report the currently applied configuration but
the set of all possible configuration options.

Adapt the driver to support the semantic of the two newly introduced
operations:
- get_mbus_config reports the current media bus configuration
- set_mbus_config applies only changes explicitly requested and updates
  the provided cfg parameter to report what has actually been applied to
  the hardware.

Compile-tested only.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
---
 drivers/media/i2c/ov6650.c | 56 ++++++++++++++++++++++++++------------
 1 file changed, 39 insertions(+), 17 deletions(-)

--- a/drivers/media/i2c/ov6650.c
+++ b/drivers/media/i2c/ov6650.c
@@ -909,46 +909,68 @@ static const struct v4l2_subdev_core_ops
 };
 
 /* Request bus settings on camera side */
-static int ov6650_g_mbus_config(struct v4l2_subdev *sd,
-				struct v4l2_mbus_config *cfg)
+static int ov6650_get_mbus_config(struct v4l2_subdev *sd,
+				  unsigned int pad,
+				  struct v4l2_mbus_config *cfg)
 {
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	u8 comj, comf;
+	int ret;
+
+	ret = ov6650_reg_read(client, REG_COMJ, &comj);
+	if (ret)
+		return ret;
+
+	ret = ov6650_reg_read(client, REG_COMF, &comf);
+	if (ret)
+		return ret;
 
-	cfg->flags = V4L2_MBUS_MASTER |
-		V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING |
-		V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW |
-		V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW |
-		V4L2_MBUS_DATA_ACTIVE_HIGH;
+	cfg->flags = V4L2_MBUS_MASTER
+		   | ((comj & COMJ_VSYNC_HIGH)  ? V4L2_MBUS_VSYNC_ACTIVE_HIGH
+						: V4L2_MBUS_VSYNC_ACTIVE_LOW)
+		   | ((comf & COMF_HREF_LOW)    ? V4L2_MBUS_HSYNC_ACTIVE_LOW
+						: V4L2_MBUS_HSYNC_ACTIVE_HIGH)
+		   | ((comj & COMJ_PCLK_RISING) ? V4L2_MBUS_PCLK_SAMPLE_RISING
+						: V4L2_MBUS_PCLK_SAMPLE_FALLING);
 	cfg->type = V4L2_MBUS_PARALLEL;
 
 	return 0;
 }
 
 /* Alter bus settings on camera side */
-static int ov6650_s_mbus_config(struct v4l2_subdev *sd,
-				const struct v4l2_mbus_config *cfg)
+static int ov6650_set_mbus_config(struct v4l2_subdev *sd,
+				  unsigned int pad,
+				  struct v4l2_mbus_config *cfg)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
-	int ret;
+	int ret = 0;
 
 	if (cfg->flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
 		ret = ov6650_reg_rmw(client, REG_COMJ, COMJ_PCLK_RISING, 0);
-	else
+	else if (cfg->flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
 		ret = ov6650_reg_rmw(client, REG_COMJ, 0, COMJ_PCLK_RISING);
 	if (ret)
-		return ret;
+		goto error;
 
 	if (cfg->flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
 		ret = ov6650_reg_rmw(client, REG_COMF, COMF_HREF_LOW, 0);
-	else
+	else if (cfg->flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
 		ret = ov6650_reg_rmw(client, REG_COMF, 0, COMF_HREF_LOW);
 	if (ret)
-		return ret;
+		goto error;
 
 	if (cfg->flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
 		ret = ov6650_reg_rmw(client, REG_COMJ, COMJ_VSYNC_HIGH, 0);
-	else
+	else if (cfg->flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
 		ret = ov6650_reg_rmw(client, REG_COMJ, 0, COMJ_VSYNC_HIGH);
 
+error:
+	/*
+	 * Update the configuration to report what is actually applied to
+	 * the hardware.
+	 */
+	ov6650_get_mbus_config(sd, pad, cfg);
+
 	return ret;
 }
 
@@ -956,8 +978,6 @@ static const struct v4l2_subdev_video_op
 	.s_stream	= ov6650_s_stream,
 	.g_frame_interval = ov6650_g_frame_interval,
 	.s_frame_interval = ov6650_s_frame_interval,
-	.g_mbus_config	= ov6650_g_mbus_config,
-	.s_mbus_config	= ov6650_s_mbus_config,
 };
 
 static const struct v4l2_subdev_pad_ops ov6650_pad_ops = {
@@ -966,6 +986,8 @@ static const struct v4l2_subdev_pad_ops
 	.set_selection	= ov6650_set_selection,
 	.get_fmt	= ov6650_get_fmt,
 	.set_fmt	= ov6650_set_fmt,
+	.get_mbus_config = ov6650_get_mbus_config,
+	.set_mbus_config = ov6650_set_mbus_config,
 };
 
 static const struct v4l2_subdev_ops ov6650_subdev_ops = {