[PATCH 05/10] media: i2c: ov9282: add refresh of missing ranges on a mode change

[Richard Leitner <richard.leitner@linux.dev>]

ov9282_update_controls() updates the pixel rate, hblank and vblank, but
currently misses the exposure range and flash_duration. Both are dependent
on the line time and therefore the pixel format.

Refresh both, and commit cur_mode and code in ov9282_set_pad_format()
before the call so the refresh and any nested s_ctrl see the incoming
format.

Signed-off-by: Richard Leitner <richard.leitner@linux.dev>
---
 drivers/media/i2c/ov9282.c | 39 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 34 insertions(+), 5 deletions(-)

diff --git a/drivers/media/i2c/ov9282.c b/drivers/media/i2c/ov9282.c
index 4c88de1965171..e64d8343c18e9 100644
--- a/drivers/media/i2c/ov9282.c
+++ b/drivers/media/i2c/ov9282.c
@@ -557,6 +557,8 @@ static int ov9282_update_controls(struct ov9282 *ov9282,
 {
 	u32 hblank_min;
 	s64 pixel_rate;
+	u32 exposure_us;
+	u32 lpfr;
 	int ret;
 
 	ret = __v4l2_ctrl_s_ctrl(ov9282->link_freq_ctrl, mode->link_freq_idx);
@@ -577,8 +579,22 @@ static int ov9282_update_controls(struct ov9282 *ov9282,
 	if (ret)
 		return ret;
 
-	return __v4l2_ctrl_modify_range(ov9282->vblank_ctrl, mode->vblank_min,
-					mode->vblank_max, 1, mode->vblank);
+	ret = __v4l2_ctrl_modify_range(ov9282->vblank_ctrl, mode->vblank_min,
+				       mode->vblank_max, 1, mode->vblank);
+	if (ret)
+		return ret;
+
+	lpfr = ov9282->vblank_ctrl->val + mode->height;
+	ret = __v4l2_ctrl_modify_range(ov9282->exp_ctrl, OV9282_EXPOSURE_MIN,
+				       lpfr - OV9282_EXPOSURE_OFFSET,
+				       OV9282_EXPOSURE_STEP,
+				       OV9282_EXPOSURE_DEFAULT);
+	if (ret)
+		return ret;
+
+	exposure_us = ov9282_exposure_to_us(ov9282, ov9282->exp_ctrl->val);
+	return __v4l2_ctrl_modify_range(ov9282->flash_duration, 0, exposure_us,
+					1, OV9282_STROBE_FRAME_SPAN_DEFAULT);
 }
 
 /**
@@ -855,10 +871,23 @@ static int ov9282_set_pad_format(struct v4l2_subdev *sd,
 		framefmt = v4l2_subdev_state_get_format(sd_state, fmt->pad);
 		*framefmt = fmt->format;
 	} else {
+		const struct ov9282_mode *old_mode = ov9282->cur_mode;
+		u32 old_code = ov9282->code;
+
+		/*
+		 * Commit before refreshing the ranges. ov9282_update_controls()
+		 * and the nested ov9282_set_ctrl() calls it triggers derive the
+		 * frame length and the line time from cur_mode and code, so
+		 * they have to describe the incoming format, not the outgoing
+		 * one.
+		 */
+		ov9282->cur_mode = mode;
+		ov9282->code = code;
+
 		ret = ov9282_update_controls(ov9282, mode, fmt);
-		if (!ret) {
-			ov9282->cur_mode = mode;
-			ov9282->code = code;
+		if (ret) {
+			ov9282->cur_mode = old_mode;
+			ov9282->code = old_code;
 		}
 	}
 

-- 
2.53.0