media: i2c: imx290: Add support for test pattern generation

Add support for generating following test patterns by IMX290:

* Sequence Pattern 1
* Horizontal Color-bar Chart
* Vertical Color-bar Chart
* Sequence Pattern 2
* Gradation Pattern 1
* Gradation Pattern 2
* 000/555h Toggle Pattern
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Andrey Konovalov <andrey.konovalov@linaro.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/i2c/imx290.c

@@ -26,12 +26,19 @@
 #define IMX290_REGHOLD 0x3001
 #define IMX290_XMSTA 0x3002
 #define IMX290_FR_FDG_SEL 0x3009
+#define IMX290_BLKLEVEL_LOW 0x300a
+#define IMX290_BLKLEVEL_HIGH 0x300b
 #define IMX290_GAIN 0x3014
 #define IMX290_HMAX_LOW 0x301c
 #define IMX290_HMAX_HIGH 0x301d
+#define IMX290_PGCTRL 0x308c
 #define IMX290_PHY_LANE_NUM 0x3407
 #define IMX290_CSI_LANE_MODE 0x3443
 
+#define IMX290_PGCTRL_REGEN BIT(0)
+#define IMX290_PGCTRL_THRU BIT(1)
+#define IMX290_PGCTRL_MODE(n) ((n) << 4)
+
 static const char * const imx290_supply_name[] = {
 	"vdda",
 	"vddd",
@@ -91,6 +98,17 @@ static const struct regmap_config imx290_regmap_config = {
 	.cache_type = REGCACHE_RBTREE,
 };
 
+static const char * const imx290_test_pattern_menu[] = {
+	"Disabled",
+	"Sequence Pattern 1",
+	"Horizontal Color-bar Chart",
+	"Vertical Color-bar Chart",
+	"Sequence Pattern 2",
+	"Gradation Pattern 1",
+	"Gradation Pattern 2",
+	"000/555h Toggle Pattern",
+};
+
 static const struct imx290_regval imx290_global_init_settings[] = {
 	{ 0x3007, 0x00 },
 	{ 0x3018, 0x65 },
@@ -448,6 +466,22 @@ static int imx290_set_ctrl(struct v4l2_ctrl *ctrl)
 	case V4L2_CID_GAIN:
 		ret = imx290_set_gain(imx290, ctrl->val);
 		break;
+	case V4L2_CID_TEST_PATTERN:
+		if (ctrl->val) {
+			imx290_write_reg(imx290, IMX290_BLKLEVEL_LOW, 0x00);
+			imx290_write_reg(imx290, IMX290_BLKLEVEL_HIGH, 0x00);
+			msleep(10);
+			imx290_write_reg(imx290, IMX290_PGCTRL,
+					 (u8)(IMX290_PGCTRL_REGEN |
+					 IMX290_PGCTRL_THRU |
+					 IMX290_PGCTRL_MODE(ctrl->val)));
+		} else {
+			imx290_write_reg(imx290, IMX290_PGCTRL, 0x00);
+			msleep(10);
+			imx290_write_reg(imx290, IMX290_BLKLEVEL_LOW, 0x3c);
+			imx290_write_reg(imx290, IMX290_BLKLEVEL_HIGH, 0x00);
+		}
+		break;
 	default:
 		ret = -EINVAL;
 		break;
@@ -959,7 +993,7 @@ static int imx290_probe(struct i2c_client *client)
 	 */
 	imx290_entity_init_cfg(&imx290->sd, NULL);
 
-	v4l2_ctrl_handler_init(&imx290->ctrls, 3);
+	v4l2_ctrl_handler_init(&imx290->ctrls, 4);
 
 	v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops,
 			  V4L2_CID_GAIN, 0, 72, 1, 0);
@@ -977,6 +1011,11 @@ static int imx290_probe(struct i2c_client *client)
 					       1, INT_MAX, 1,
 					       imx290_calc_pixel_rate(imx290));
 
+	v4l2_ctrl_new_std_menu_items(&imx290->ctrls, &imx290_ctrl_ops,
+				     V4L2_CID_TEST_PATTERN,
+				     ARRAY_SIZE(imx290_test_pattern_menu) - 1,
+				     0, 0, imx290_test_pattern_menu);
+
 	imx290->sd.ctrl_handler = &imx290->ctrls;
 
 	if (imx290->ctrls.error) {