Add support of DVP parallel mode in addition of
existing MIPI CSI mode. The choice between two modes
and configuration is made through device tree.
Signed-off-by: Hugues Fruchet <hugues.fruchet@xxxxxx>
---
drivers/media/i2c/ov5640.c | 101 +++++++++++++++++++++++++++++++++++++--------
1 file changed, 83 insertions(+), 18 deletions(-)
diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
index a576d11..826b102 100644
--- a/drivers/media/i2c/ov5640.c
+++ b/drivers/media/i2c/ov5640.c
@@ -34,14 +34,20 @@
#define OV5640_DEFAULT_SLAVE_ID 0x3c
+#define OV5640_REG_SYS_CTRL0 0x3008
#define OV5640_REG_CHIP_ID_HIGH 0x300a
#define OV5640_REG_CHIP_ID_LOW 0x300b
+#define OV5640_REG_IO_MIPI_CTRL00 0x300e
+#define OV5640_REG_PAD_OUTPUT_ENABLE01 0x3017
+#define OV5640_REG_PAD_OUTPUT_ENABLE02 0x3018
#define OV5640_REG_PAD_OUTPUT00 0x3019
+#define OV5640_REG_SYSTEM_CONTROL1 0x302e
#define OV5640_REG_SC_PLL_CTRL0 0x3034
#define OV5640_REG_SC_PLL_CTRL1 0x3035
#define OV5640_REG_SC_PLL_CTRL2 0x3036
#define OV5640_REG_SC_PLL_CTRL3 0x3037
#define OV5640_REG_SLAVE_ID 0x3100
+#define OV5640_REG_SCCB_SYS_CTRL1 0x3103
#define OV5640_REG_SYS_ROOT_DIVIDER 0x3108
#define OV5640_REG_AWB_R_GAIN 0x3400
#define OV5640_REG_AWB_G_GAIN 0x3402
@@ -1006,7 +1012,65 @@ static int ov5640_get_gain(struct ov5640_dev *sensor)
return gain & 0x3ff;
}
-static int ov5640_set_stream(struct ov5640_dev *sensor, bool on)
+static int ov5640_set_stream_dvp(struct ov5640_dev *sensor, bool on)
+{
+ int ret;
+
+ if (on) {
+ /*
+ * reset MIPI PCLK/SERCLK divider
+ *
+ * SC PLL CONTRL1 0
+ * - [3..0]: MIPI PCLK/SERCLK divider
+ */
+ ret = ov5640_mod_reg(sensor, OV5640_REG_SC_PLL_CTRL1, 0xF, 0);
+ if (ret)
+ return ret;
+ }
+
+ /*
+ * powerdown MIPI TX/RX PHY & disable MIPI
+ *
+ * MIPI CONTROL 00
+ * 4: PWDN PHY TX
+ * 3: PWDN PHY RX
+ * 2: MIPI enable
+ */
+ ret = ov5640_write_reg(sensor,
+ OV5640_REG_IO_MIPI_CTRL00, on ? 0x18 : 0);
+ if (ret)
+ return ret;
+
+ /*
+ * enable VSYNC/HREF/PCLK DVP control lines
+ * & D[9:6] DVP data lines
+ *
+ * PAD OUTPUT ENABLE 01
+ * - 6: VSYNC output enable
+ * - 5: HREF output enable
+ * - 4: PCLK output enable
+ * - [3:0]: D[9:6] output enable
+ */
+ ret = ov5640_write_reg(sensor,
+ OV5640_REG_PAD_OUTPUT_ENABLE01, on ? 0x7f : 0);
+ if (ret)
+ return ret;
+
+ /*
+ * enable D[5:2] DVP data lines (D[0:1] are unused with 8 bits
+ * parallel mode, 8 bits output are mapped on D[9:2])
+ *
+ * PAD OUTPUT ENABLE 02
+ * - [7:4]: D[5:2] output enable
+ * 0:1 are unused with 8 bits
+ * parallel mode (8 bits output
+ * are on D[9:2])
+ */
+ return ov5640_write_reg(sensor,
+ OV5640_REG_PAD_OUTPUT_ENABLE02, on ? 0xf0 : 0);
+}
+
+static int ov5640_set_stream_mipi(struct ov5640_dev *sensor, bool on)
{
int ret;
@@ -1598,17 +1662,19 @@ static int ov5640_set_power(struct ov5640_dev *sensor, bool on)
if (ret)
goto power_off;
- /*
- * start streaming briefly followed by stream off in
- * order to coax the clock lane into LP-11 state.
- */
- ret = ov5640_set_stream(sensor, true);
- if (ret)
- goto power_off;
- usleep_range(1000, 2000);
- ret = ov5640_set_stream(sensor, false);
- if (ret)
- goto power_off;
+ if (sensor->ep.bus_type == V4L2_MBUS_CSI2) {
+ /*
+ * start streaming briefly followed by stream off in
+ * order to coax the clock lane into LP-11 state.
+ */
+ ret = ov5640_set_stream_mipi(sensor, true);
+ if (ret)
+ goto power_off;
+ usleep_range(1000, 2000);
+ ret = ov5640_set_stream_mipi(sensor, false);
+ if (ret)
+ goto power_off;
+ }
return 0;
}
@@ -2185,7 +2251,11 @@ static int ov5640_s_stream(struct v4l2_subdev *sd, int enable)
goto out;
}
- ret = ov5640_set_stream(sensor, enable);
+ if (sensor->ep.bus_type == V4L2_MBUS_CSI2)
+ ret = ov5640_set_stream_mipi(sensor, enable);
+ else
+ ret = ov5640_set_stream_dvp(sensor, enable);
+
if (!ret)
sensor->streaming = enable;
}
@@ -2270,11 +2340,6 @@ static int ov5640_probe(struct i2c_client *client,
return ret;
}
- if (sensor->ep.bus_type != V4L2_MBUS_CSI2) {
- dev_err(dev, "invalid bus type, must be MIPI CSI2\n");
- return -EINVAL;
- }
-
/* get system clock (xclk) */
sensor->xclk = devm_clk_get(dev, "xclk");
if (IS_ERR(sensor->xclk)) {
--
1.9.1
