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authorNaushir Patuck <naush@raspberrypi.com>2021-07-12 11:02:06 +0100
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2021-07-12 15:57:10 +0300
commit6d89e33814d6f43873d2f38a13a12528f63a7e0d (patch)
treed16fcba8cb6232aa8a0871d0b3c79fcbc87792e0 /Documentation/guides/introduction.rst
parent2d6a9b3592fe4ce8a68e5ed125395708cb5bd0fa (diff)
ipa: raspberrypi: Allow long exposure modes for imx477.
Update the imx477 CamHelper to use long exposure modes if needed. This is done by overloading the CamHelper::GetVBlanking function to return a frame length (and vblank value) computed using a scaling factor when the value would be larger than what the sensor register could otherwise hold. CamHelperImx477::Prepare is also overloaded to ensure that the "device.status" metadata returns the right value if the long exposure scaling factor is used. The scaling factor is unfortunately not returned back in metadata. With the current imx477 driver, we can achieve a maximum exposure time of approx 127 seconds since the HBLANK control is read-only. Signed-off-by: Naushir Patuck <naush@raspberrypi.com> Reviewed-by: David Plowman <david.plowman@raspberrypi.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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