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media: i2c: imx477: Enable HSYNC output on GPO when trigger_mode=1#7461

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media: i2c: imx477: Enable HSYNC output on GPO when trigger_mode=1#7461
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@njhollinghurst

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This is for test purposes only (it is not needed for camera sync).

Note that the poorly-documented CKTESTSEL register must be set to 0 to enable HSYNC output. Its reset value is 0x07, which disables it. This appears to have no effect on the XVS pin when used as a sync signal (as opposed to a test signal).

Draft pending further testing and user feedback.

This is for test purposes only (it is not needed for camera sync).

Signed-off-by: Nick Hollinghurst <nick.hollinghurst@raspberrypi.com>
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njhollinghurst commented Jun 29, 2026

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The writes to OUTIF2 and MNTTEST3_SEL_H can perhaps be omitted, as their reset values are already zero.

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