media: staging: imx: use ktime_t for timestamps

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The imx media driver passes around monotonic timestamps in the deprecated
'timespec' format. This is not a problem for the driver, as they won't
overflow, but moving to either timespec64 or ktime_t is preferred.

I'm picking ktime_t for simplicity here. frame_interval_monitor() is
the main function that changes, as it tries to compare a time interval
in microseconds. The algorithm slightly changes here, to avoid 64-bit
division. The code previously assumed that the error was at most 32-bit
worth of microseconds here, so I'm making the same assumption but add
an explicit test for it.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

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Arnd Bergmann 2017-11-27 08:20:00 -05:00 • committed by Mauro Carvalho Chehab

parent 6c542426b6

commit 1d88f4bccf

3 changed files with 20 additions and 20 deletions

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8

drivers/staging/media/imx/imx-media-csi.c

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30

drivers/staging/media/imx/imx-media-fim.c

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2

drivers/staging/media/imx/imx-media.h

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