media: i2c: ov5640: Remain in power down for DVP mode unless streaming

Keep the sensor in software power down mode and wake up only in
ov5640_set_stream_dvp() callback.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Tested-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/i2c/ov5640.c

@@ -34,6 +34,8 @@
 #define OV5640_REG_SYS_RESET02		0x3002
 #define OV5640_REG_SYS_CLOCK_ENABLE02	0x3006
 #define OV5640_REG_SYS_CTRL0		0x3008
+#define OV5640_REG_SYS_CTRL0_SW_PWDN	0x42
+#define OV5640_REG_SYS_CTRL0_SW_PWUP	0x02
 #define OV5640_REG_CHIP_ID		0x300a
 #define OV5640_REG_IO_MIPI_CTRL00	0x300e
 #define OV5640_REG_PAD_OUTPUT_ENABLE01	0x3017
@@ -1120,6 +1122,12 @@ static int ov5640_load_regs(struct ov5640_dev *sensor,
 		val = regs->val;
 		mask = regs->mask;
 
+		/* remain in power down mode for DVP */
+		if (regs->reg_addr == OV5640_REG_SYS_CTRL0 &&
+		    val == OV5640_REG_SYS_CTRL0_SW_PWUP &&
+		    sensor->ep.bus_type != V4L2_MBUS_CSI2_DPHY)
+			continue;
+
 		if (mask)
 			ret = ov5640_mod_reg(sensor, reg_addr, mask, val);
 		else
@@ -1297,9 +1305,14 @@ static int ov5640_set_stream_dvp(struct ov5640_dev *sensor, bool on)
 	 * PAD OUTPUT ENABLE 02
 	 * - [7:2]:	D[5:0] output enable
 	 */
-	return ov5640_write_reg(sensor,
-				OV5640_REG_PAD_OUTPUT_ENABLE02,
-				on ? 0xfc : 0);
+	ret = ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT_ENABLE02,
+			       on ? 0xfc : 0);
+	if (ret)
+		return ret;
+
+	return ov5640_write_reg(sensor, OV5640_REG_SYS_CTRL0, on ?
+				OV5640_REG_SYS_CTRL0_SW_PWUP :
+				OV5640_REG_SYS_CTRL0_SW_PWDN);
 }
 
 static int ov5640_set_stream_mipi(struct ov5640_dev *sensor, bool on)