[PATCH v3 15/20] media: imx355: Define the exposure offset, and use that define

[Dave Stevenson <dave.stevenson@raspberrypi.com>]

The difference between frame length and max exposure time in
lines is 10. That had been used as a bare value in calculations.

Move it to a define, and use that define.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/media/i2c/imx355.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/imx355.c b/drivers/media/i2c/imx355.c
index 2bf8da7469fe..3b86bd2e2e5e 100644
--- a/drivers/media/i2c/imx355.c
+++ b/drivers/media/i2c/imx355.c
@@ -51,6 +51,7 @@
 #define IMX355_EXPOSURE_MIN		1
 #define IMX355_EXPOSURE_STEP		1
 #define IMX355_EXPOSURE_DEFAULT		0x0282
+#define IMX355_EXPOSURE_OFFSET		10
 
 /* Analog gain control */
 #define IMX355_REG_ANALOG_GAIN		CCI_REG16(0x0204)
@@ -635,7 +636,7 @@ static int imx355_set_ctrl(struct v4l2_ctrl *ctrl)
 	switch (ctrl->id) {
 	case V4L2_CID_VBLANK:
 		/* Update max exposure while meeting expected vblanking */
-		max = imx355->cur_mode->height + ctrl->val - 10;
+		max = imx355->cur_mode->height + ctrl->val - IMX355_EXPOSURE_OFFSET;
 		__v4l2_ctrl_modify_range(imx355->exposure,
 					 imx355->exposure->minimum,
 					 max, imx355->exposure->step, max);
@@ -1129,7 +1130,7 @@ static int imx355_init_controls(struct imx355 *imx355)
 		imx355->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;
 
 	/* fll >= exposure time + adjust parameter (default value is 10) */
-	exposure_max = mode->fll_def - 10;
+	exposure_max = mode->fll_def - IMX355_EXPOSURE_OFFSET;
 	imx355->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &imx355_ctrl_ops,
 					     V4L2_CID_EXPOSURE,
 					     IMX355_EXPOSURE_MIN, exposure_max,

-- 
2.34.1