Candidate fixes for camera sync issues#6863
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pelwell merged 2 commits intoraspberrypi:rpi-6.12.yfrom Jun 3, 2025
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To avoid lost frame start in a subsequent session, avoid setting the number of lanes back to 1 or putting CSI-2 Host into reset. It's not clear if this is a watertight fix -- what if the camera itself produced a truncated or garbled packet, or continued to send until the next start? -- but it does seem to fix the issue. Signed-off-by: Nick Hollinghurst <nick.hollinghurst@raspberrypi.com>
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Largely looks fine. Two very minor comments.
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My comments are largely in regard to the imx477 change. I know very little of the CFE DPHY side. |
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I think we need these changes (or something similar) for reliable cam->cam sync of IMX477 on Pi5. But I guess we should hold off merging, until we get a comment from Sony about the temperature sensor issue. Perhaps they will recommend some simpler fix -- a chicken bit perhaps? |
On IMX477 it appears that the on-chip temperature sensor causes XVS (external sync out) to pulse every ~2ms when not streaming. So now we do a little dance: Temperature sensor is enabled during common register setup, giving it time to warm up (almost literally; otherwise the first frame's reading might be 0C), disabled before enabling sync out, then enabled again once the camera is streaming. We already took care to disable XVS output in stop_streaming() (though previously it wasn't understood why this was needed). Signed-off-by: Nick Hollinghurst <nick.hollinghurst@raspberrypi.com>
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Swapped two register writes in the second (IMX477) commit to make it closer to manufacturer's recommendation. |
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kernel: overlays: sc16is75x: Add generic SPI overlay See: raspberrypi/linux#6865 kernel: add mira220 image sensor See: raspberrypi/linux#6717 kernel: defconfigs: Enable WATCHDOG_SYSFS See: raspberrypi/linux#6875 kernel: drivers: pci: hailo: Better lock handling when calling find_vdma() See: raspberrypi/linux#6868 kernel: drivers: media: imx500: Enable sensor temperature monitoring See: raspberrypi/linux#6877 kernel: firmware: rp1: Rename to rp1-fw to avoid module name collision See: raspberrypi/linux#6879 kernel: Candidate fixes for camera sync issues See: raspberrypi/linux#6863
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kernel: overlays: sc16is75x: Add generic SPI overlay See: raspberrypi/linux#6865 kernel: add mira220 image sensor See: raspberrypi/linux#6717 kernel: defconfigs: Enable WATCHDOG_SYSFS See: raspberrypi/linux#6875 kernel: drivers: pci: hailo: Better lock handling when calling find_vdma() See: raspberrypi/linux#6868 kernel: drivers: media: imx500: Enable sensor temperature monitoring See: raspberrypi/linux#6877 kernel: firmware: rp1: Rename to rp1-fw to avoid module name collision See: raspberrypi/linux#6879 kernel: Candidate fixes for camera sync issues See: raspberrypi/linux#6863
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Two issues currently, one is #5821 and is specific to Raspberry Pi 5.
There is also an IMX477 issue, where there are very rarely extra XVS pulses, causing receiving cameras to record a blank frame.