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media: ov2680: Fix exposure and gain ctrls range and default value

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The exposure control's max effective value is VTS - 8, set the control
range to match this. Thas means that if/when a future commit makes VTS
configurable as a control itself the exposure range needs to be
updated dynamically to match the VTS value.

The gain control goes from 0 - 1023, higher values wrap around to
the lowest gain setting.

The gain control, controls an analog gain so use V4L2_CID_ANALOGUE_GAIN
for it instead of V4L2_CID_GAIN.

Also stop setting 0 as default for both controls this leads to
a totally black picture which is no good. This is esp. important
for tests of the sensor driver without (userspace driven)
auto exposure / gain.

Acked-by: Rui Miguel Silva <rmfrfs@gmail.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Hans de Goede 2023-08-03 11:33:39 +02:00 committed by Mauro Carvalho Chehab
parent 3b378b35e8
commit 05d6bd86dc
1 changed files with 8 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/media/i2c/ov2680.c
View File

@ -81,6 +81,9 @@
/* If possible send 16 extra rows / lines to the ISP as padding */
#define OV2680_END_MARGIN 16
/* Max exposure time is VTS - 8 */
#define OV2680_INTEGRATION_TIME_MARGIN 8
#define OV2680_DEFAULT_WIDTH 800
#define OV2680_DEFAULT_HEIGHT 600
@ -779,7 +782,7 @@ static int ov2680_s_ctrl(struct v4l2_ctrl *ctrl)
}
switch (ctrl->id) {
case V4L2_CID_GAIN:
case V4L2_CID_ANALOGUE_GAIN:
ret = ov2680_gain_set(sensor, ctrl->val);
break;
case V4L2_CID_EXPOSURE:
@ -849,6 +852,7 @@ static int ov2680_v4l2_register(struct ov2680_dev *sensor)
const struct v4l2_ctrl_ops *ops = &ov2680_ctrl_ops;
struct ov2680_ctrls *ctrls = &sensor->ctrls;
struct v4l2_ctrl_handler *hdl = &ctrls->handler;
int exp_max = OV2680_LINES_PER_FRAME - OV2680_INTEGRATION_TIME_MARGIN;
int ret = 0;
v4l2_i2c_subdev_init(&sensor->sd, client, &ov2680_subdev_ops);
@ -874,9 +878,10 @@ static int ov2680_v4l2_register(struct ov2680_dev *sensor)
0, 0, test_pattern_menu);
ctrls->exposure = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_EXPOSURE,
0, 32767, 1, 0);
0, exp_max, 1, exp_max);
ctrls->gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_GAIN, 0, 2047, 1, 0);
ctrls->gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_ANALOGUE_GAIN,
0, 1023, 1, 250);
if (hdl->error) {
ret = hdl->error;