media: i2c: imx283: Recalculate SHR on blanking changes

The exposure control on the imx283 is handled through the SHR register.
This value is calculated based upon the hmax and vmax registers as a
property of the total line and frame length.

Ensure that the SHR is updated whenever the blankings update and adjust
the frame intervals to ensure the correct exposure is configured on the
sensor.

Signed-off-by: Kieran Bingham <[email protected]>

Author: kbingham

drivers/media/i2c/imx283.c

@@ -909,13 +909,23 @@ static int imx283_set_ctrl(struct v4l2_ctrl *ctrl)
 		dev_dbg(imx283->dev, "V4L2_CID_HBLANK : %d  HMAX : %u\n",
 			ctrl->val, imx283->hmax);
 		ret = cci_write(imx283->cci, IMX283_REG_HMAX, imx283->hmax, NULL);
+
+		/* Recompute the SHR based on the new timings */
+		shr = imx283_shr(imx283, mode, imx283->exposure->val);
+		cci_write(imx283->cci, IMX283_REG_SHR, shr, &ret);
+
 		break;
 
 	case V4L2_CID_VBLANK:
 		imx283->vmax = mode->height + ctrl->val;
 		dev_dbg(imx283->dev, "V4L2_CID_VBLANK : %d  VMAX : %u\n",
 			ctrl->val, imx283->vmax);
 		ret = cci_write(imx283->cci, IMX283_REG_VMAX, imx283->vmax, NULL);
+
+		/* Recompute the SHR based on the new timings */
+		shr = imx283_shr(imx283, mode, imx283->exposure->val);
+		cci_write(imx283->cci, IMX283_REG_SHR, shr, &ret);
+
 		break;
 
 	case V4L2_CID_ANALOGUE_GAIN: