[media] mt9v032: Provide link frequency control

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/i2c/mt9v032.c

@@ -29,6 +29,8 @@
 #define MT9V032_PIXEL_ARRAY_HEIGHT			492
 #define MT9V032_PIXEL_ARRAY_WIDTH			782
 
+#define MT9V032_SYSCLK_FREQ_DEF				26600000
+
 #define MT9V032_CHIP_VERSION				0x00
 #define		MT9V032_CHIP_ID_REV1			0x1311
 #define		MT9V032_CHIP_ID_REV3			0x1313
@@ -122,13 +124,18 @@ struct mt9v032 {
 	struct v4l2_mbus_framefmt format;
 	struct v4l2_rect crop;
 
-	struct v4l2_ctrl *pixel_rate;
 	struct v4l2_ctrl_handler ctrls;
+	struct {
+		struct v4l2_ctrl *link_freq;
+		struct v4l2_ctrl *pixel_rate;
+	};
 
 	struct mutex power_lock;
 	int power_count;
 
 	struct mt9v032_platform_data *pdata;
+
+	u32 sysclk;
 	u16 chip_control;
 	u16 aec_agc;
 };
@@ -196,7 +203,7 @@ static int mt9v032_power_on(struct mt9v032 *mt9v032)
 	int ret;
 
 	if (mt9v032->pdata->set_clock) {
-		mt9v032->pdata->set_clock(&mt9v032->subdev, EXT_CLK);
+		mt9v032->pdata->set_clock(&mt9v032->subdev, mt9v032->sysclk);
 		udelay(1);
 	}
 
@@ -374,7 +381,8 @@ static void mt9v032_configure_pixel_rate(struct mt9v032 *mt9v032,
 	struct i2c_client *client = v4l2_get_subdevdata(&mt9v032->subdev);
 	int ret;
 
-	ret = v4l2_ctrl_s_ctrl_int64(mt9v032->pixel_rate, EXT_CLK / hratio);
+	ret = v4l2_ctrl_s_ctrl_int64(mt9v032->pixel_rate,
+				     mt9v032->sysclk / hratio);
 	if (ret < 0)
 		dev_warn(&client->dev, "failed to set pixel rate (%d)\n", ret);
 }
@@ -487,6 +495,7 @@ static int mt9v032_s_ctrl(struct v4l2_ctrl *ctrl)
 	struct mt9v032 *mt9v032 =
 			container_of(ctrl->handler, struct mt9v032, ctrls);
 	struct i2c_client *client = v4l2_get_subdevdata(&mt9v032->subdev);
+	u32 freq;
 	u16 data;
 
 	switch (ctrl->id) {
@@ -505,6 +514,16 @@ static int mt9v032_s_ctrl(struct v4l2_ctrl *ctrl)
 		return mt9v032_write(client, MT9V032_TOTAL_SHUTTER_WIDTH,
 				     ctrl->val);
 
+	case V4L2_CID_PIXEL_RATE:
+	case V4L2_CID_LINK_FREQ:
+		if (mt9v032->link_freq == NULL)
+			break;
+
+		freq = mt9v032->pdata->link_freqs[mt9v032->link_freq->val];
+		mt9v032->pixel_rate->val64 = freq;
+		mt9v032->sysclk = freq;
+		break;
+
 	case V4L2_CID_TEST_PATTERN:
 		switch (ctrl->val) {
 		case 0:
@@ -683,6 +702,7 @@ static const struct v4l2_subdev_internal_ops mt9v032_subdev_internal_ops = {
 static int mt9v032_probe(struct i2c_client *client,
 		const struct i2c_device_id *did)
 {
+	struct mt9v032_platform_data *pdata = client->dev.platform_data;
 	struct mt9v032 *mt9v032;
 	unsigned int i;
 	int ret;
@@ -699,9 +719,9 @@ static int mt9v032_probe(struct i2c_client *client,
 		return -ENOMEM;
 
 	mutex_init(&mt9v032->power_lock);
-	mt9v032->pdata = client->dev.platform_data;
+	mt9v032->pdata = pdata;
 
-	v4l2_ctrl_handler_init(&mt9v032->ctrls, ARRAY_SIZE(mt9v032_ctrls) + 5);
+	v4l2_ctrl_handler_init(&mt9v032->ctrls, ARRAY_SIZE(mt9v032_ctrls) + 6);
 
 	v4l2_ctrl_new_std(&mt9v032->ctrls, &mt9v032_ctrl_ops,
 			  V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
@@ -715,10 +735,27 @@ static int mt9v032_probe(struct i2c_client *client,
 			  V4L2_CID_EXPOSURE, MT9V032_TOTAL_SHUTTER_WIDTH_MIN,
 			  MT9V032_TOTAL_SHUTTER_WIDTH_MAX, 1,
 			  MT9V032_TOTAL_SHUTTER_WIDTH_DEF);
+
 	mt9v032->pixel_rate =
 		v4l2_ctrl_new_std(&mt9v032->ctrls, &mt9v032_ctrl_ops,
 				  V4L2_CID_PIXEL_RATE, 0, 0, 1, 0);
 
+	if (pdata && pdata->link_freqs) {
+		unsigned int def = 0;
+
+		for (i = 0; pdata->link_freqs[i]; ++i) {
+			if (pdata->link_freqs[i] == pdata->link_def_freq)
+				def = i;
+		}
+
+		mt9v032->link_freq =
+			v4l2_ctrl_new_int_menu(&mt9v032->ctrls,
+					       &mt9v032_ctrl_ops,
+					       V4L2_CID_LINK_FREQ, i - 1, def,
+					       pdata->link_freqs);
+		v4l2_ctrl_cluster(2, &mt9v032->link_freq);
+	}
+
 	for (i = 0; i < ARRAY_SIZE(mt9v032_ctrls); ++i)
 		v4l2_ctrl_new_custom(&mt9v032->ctrls, &mt9v032_ctrls[i], NULL);
 
@@ -740,6 +777,7 @@ static int mt9v032_probe(struct i2c_client *client,
 	mt9v032->format.colorspace = V4L2_COLORSPACE_SRGB;
 
 	mt9v032->aec_agc = MT9V032_AEC_ENABLE | MT9V032_AGC_ENABLE;
+	mt9v032->sysclk = MT9V032_SYSCLK_FREQ_DEF;
 
 	v4l2_i2c_subdev_init(&mt9v032->subdev, client, &mt9v032_subdev_ops);
 	mt9v032->subdev.internal_ops = &mt9v032_subdev_internal_ops;

include/media/mt9v032.h

@@ -7,6 +7,9 @@ struct mt9v032_platform_data {
 	unsigned int clk_pol:1;
 
 	void (*set_clock)(struct v4l2_subdev *subdev, unsigned int rate);
+
+	const s64 *link_freqs;
+	s64 link_def_freq;
 };
 
 #endif