From e5fc0132f80d644757373ab0e0e3db00fe6ee010 Mon Sep 17 00:00:00 2001 From: Naushir Patuck Date: Mon, 10 Oct 2022 08:42:32 +0100 Subject: camera_sensor: Add minimum and maximum line length to IPACameraSensorInfo Add fields for minimum and maximum line length (in units of pixels) to the IPACameraSensorInfo structure. This replaces the existing lineLength field. Update the ipu3, raspberrypi and rkisp1 IPAs to use IPACameraSensorInfo::minLineLength instead of IPACameraSensorInfo::lineLength, as logically we will always want to use the fastest sensor readout by default. Since the IPAs now use minLineLength for their calculations, set the starting value of the V4L2_CID_HBLANK control to its minimum in CameraSensor::init(). Signed-off-by: Naushir Patuck Tested-by: Dave Stevenson Reviewed-by: Laurent Pinchart Signed-off-by: Laurent Pinchart --- src/libcamera/camera_sensor.cpp | 32 ++++++++++++++++++++++++++++++-- 1 file changed, 30 insertions(+), 2 deletions(-) (limited to 'src/libcamera/camera_sensor.cpp') diff --git a/src/libcamera/camera_sensor.cpp b/src/libcamera/camera_sensor.cpp index 911fd0be..572a313a 100644 --- a/src/libcamera/camera_sensor.cpp +++ b/src/libcamera/camera_sensor.cpp @@ -176,6 +176,32 @@ int CameraSensor::init() if (ret) return ret; + /* + * 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. + */ + const ControlInfo hblank = ctrls.infoMap()->at(V4L2_CID_HBLANK); + const int32_t hblankMin = hblank.min().get(); + const int32_t hblankMax = hblank.max().get(); + + if (hblankMin != hblankMax) { + ControlList ctrl(subdev_->controls()); + + ctrl.set(V4L2_CID_HBLANK, hblankMin); + ret = subdev_->setControls(&ctrl); + if (ret) + return ret; + } + return applyTestPatternMode(controls::draft::TestPatternModeEnum::TestPatternModeOff); } @@ -883,10 +909,12 @@ int CameraSensor::sensorInfo(IPACameraSensorInfo *info) const return -EINVAL; } - int32_t hblank = ctrls.get(V4L2_CID_HBLANK).get(); - info->lineLength = info->outputSize.width + hblank; info->pixelRate = ctrls.get(V4L2_CID_PIXEL_RATE).get(); + const ControlInfo hblank = ctrls.infoMap()->at(V4L2_CID_HBLANK); + info->minLineLength = info->outputSize.width + hblank.min().get(); + info->maxLineLength = info->outputSize.width + hblank.max().get(); + const ControlInfo vblank = ctrls.infoMap()->at(V4L2_CID_VBLANK); info->minFrameLength = info->outputSize.height + vblank.min().get(); info->maxFrameLength = info->outputSize.height + vblank.max().get(); -- cgit v1.2.1