media: ov5640: add support of RGB565 and YUYV formats

Add RGB565 (LE & BE) and YUV422 YUYV format in addition
to existing YUV422 UYVY format.
Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/i2c/ov5640.c

@@ -76,9 +76,11 @@
 #define OV5640_REG_HZ5060_CTRL01	0x3c01
 #define OV5640_REG_SIGMADELTA_CTRL0C	0x3c0c
 #define OV5640_REG_FRAME_CTRL01		0x4202
+#define OV5640_REG_FORMAT_CONTROL00	0x4300
 #define OV5640_REG_POLARITY_CTRL00	0x4740
 #define OV5640_REG_MIPI_CTRL00		0x4800
 #define OV5640_REG_DEBUG_MODE		0x4814
+#define OV5640_REG_ISP_FORMAT_MUX_CTRL	0x501f
 #define OV5640_REG_PRE_ISP_TEST_SET1	0x503d
 #define OV5640_REG_SDE_CTRL0		0x5580
 #define OV5640_REG_SDE_CTRL1		0x5581
@@ -106,6 +108,18 @@ enum ov5640_frame_rate {
 	OV5640_NUM_FRAMERATES,
 };
 
+struct ov5640_pixfmt {
+	u32 code;
+	u32 colorspace;
+};
+
+static const struct ov5640_pixfmt ov5640_formats[] = {
+	{ MEDIA_BUS_FMT_UYVY8_2X8, V4L2_COLORSPACE_SRGB, },
+	{ MEDIA_BUS_FMT_YUYV8_2X8, V4L2_COLORSPACE_SRGB, },
+	{ MEDIA_BUS_FMT_RGB565_2X8_LE, V4L2_COLORSPACE_SRGB, },
+	{ MEDIA_BUS_FMT_RGB565_2X8_BE, V4L2_COLORSPACE_SRGB, },
+};
+
 /*
  * FIXME: remove this when a subdev API becomes available
  * to set the MIPI CSI-2 virtual channel.
@@ -1837,17 +1851,23 @@ static int ov5640_try_fmt_internal(struct v4l2_subdev *sd,
 {
 	struct ov5640_dev *sensor = to_ov5640_dev(sd);
 	const struct ov5640_mode_info *mode;
+	int i;
 
 	mode = ov5640_find_mode(sensor, fr, fmt->width, fmt->height, true);
 	if (!mode)
 		return -EINVAL;
-
 	fmt->width = mode->width;
 	fmt->height = mode->height;
-	fmt->code = sensor->fmt.code;
 
 	if (new_mode)
 		*new_mode = mode;
+
+	for (i = 0; i < ARRAY_SIZE(ov5640_formats); i++)
+		if (ov5640_formats[i].code == fmt->code)
+			break;
+	if (i >= ARRAY_SIZE(ov5640_formats))
+		fmt->code = ov5640_formats[0].code;
+
 	return 0;
 }
 
@@ -1890,6 +1910,45 @@ static int ov5640_set_fmt(struct v4l2_subdev *sd,
 	return ret;
 }
 
+static int ov5640_set_framefmt(struct ov5640_dev *sensor,
+			       struct v4l2_mbus_framefmt *format)
+{
+	int ret = 0;
+	bool is_rgb = false;
+	u8 val;
+
+	switch (format->code) {
+	case MEDIA_BUS_FMT_UYVY8_2X8:
+		/* YUV422, UYVY */
+		val = 0x3f;
+		break;
+	case MEDIA_BUS_FMT_YUYV8_2X8:
+		/* YUV422, YUYV */
+		val = 0x30;
+		break;
+	case MEDIA_BUS_FMT_RGB565_2X8_LE:
+		/* RGB565 {g[2:0],b[4:0]},{r[4:0],g[5:3]} */
+		val = 0x6F;
+		is_rgb = true;
+		break;
+	case MEDIA_BUS_FMT_RGB565_2X8_BE:
+		/* RGB565 {r[4:0],g[5:3]},{g[2:0],b[4:0]} */
+		val = 0x61;
+		is_rgb = true;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* FORMAT CONTROL00: YUV and RGB formatting */
+	ret = ov5640_write_reg(sensor, OV5640_REG_FORMAT_CONTROL00, val);
+	if (ret)
+		return ret;
+
+	/* FORMAT MUX CONTROL: ISP YUV or RGB */
+	return ov5640_write_reg(sensor, OV5640_REG_ISP_FORMAT_MUX_CTRL,
+				is_rgb ? 0x01 : 0x00);
+}
 
 /*
  * Sensor Controls.
@@ -2275,15 +2334,12 @@ static int ov5640_enum_mbus_code(struct v4l2_subdev *sd,
 				  struct v4l2_subdev_pad_config *cfg,
 				  struct v4l2_subdev_mbus_code_enum *code)
 {
-	struct ov5640_dev *sensor = to_ov5640_dev(sd);
-
 	if (code->pad != 0)
 		return -EINVAL;
-	if (code->index != 0)
+	if (code->index >= ARRAY_SIZE(ov5640_formats))
 		return -EINVAL;
 
-	code->code = sensor->fmt.code;
-
+	code->code = ov5640_formats[code->index].code;
 	return 0;
 }
 
@@ -2299,6 +2355,10 @@ static int ov5640_s_stream(struct v4l2_subdev *sd, int enable)
 			ret = ov5640_set_mode(sensor, sensor->current_mode);
 			if (ret)
 				goto out;
+
+			ret = ov5640_set_framefmt(sensor, &sensor->fmt);
+			if (ret)
+				goto out;
 		}
 
 		if (sensor->ep.bus_type == V4L2_MBUS_CSI2)