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libcamera: camera_sensor: Test for read-only HBLANK with READ_ONLY flag

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The CameraSensor class tests if the sensor HBLANK control is read-only
by comparing the minimum and maximum values, and documents this as being
a workaround for the lack of a read-only control flag in V4L2. This is
incorrect, as the V4L2 API provides such a flag. Use it to replace the
workaround.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
Laurent Pinchart 2024-02-28 14:16:04 +02:00
parent 2a6d432457
commit 58bcddbdeb
1 changed files with 7 additions and 20 deletions
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19
src/libcamera/sensor/camera_sensor.cpp
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@ -188,29 +188,16 @@ int CameraSensor::init()
* Set HBLANK to the minimum to start with a well-defined line length,
* allowing IPA modules that do not modify HBLANK to use the sensor
* minimum line length in their calculations.
*
* At present, there is no way of knowing if a control is read-only.
* As a workaround, assume that if the minimum and maximum values of
* the V4L2_CID_HBLANK control are the same, it implies the control
* is read-only.
*
* \todo The control API ought to have a flag to specify if a control
* is read-only which could be used below.
*/
if (ctrls.infoMap()->find(V4L2_CID_HBLANK) != ctrls.infoMap()->end()) {
const ControlInfo hblank = ctrls.infoMap()->at(V4L2_CID_HBLANK);
const int32_t hblankMin = hblank.min().get<int32_t>();
const int32_t hblankMax = hblank.max().get<int32_t>();
if (hblankMin != hblankMax) {
const struct v4l2_query_ext_ctrl *hblankInfo = subdev_->controlInfo(V4L2_CID_HBLANK);
if (hblankInfo && !(hblankInfo->flags & V4L2_CTRL_FLAG_READ_ONLY)) {
ControlList ctrl(subdev_->controls());
ctrl.set(V4L2_CID_HBLANK, hblankMin);
ctrl.set(V4L2_CID_HBLANK, static_cast<int32_t>(hblankInfo->minimum));
ret = subdev_->setControls(&ctrl);
if (ret)
return ret;
}
}
return applyTestPatternMode(controls::draft::TestPatternModeEnum::TestPatternModeOff);
}