media: atmel: atmel-isc: reworked white balance feature

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Reworked auto white balance feature (awb) to cope with all four channels.
Implemented stretching and grey world algorithms.
Using the histogram, the ISC will auto adjust the white balance during
frame captures.
Because each histogram needs a frame, it will take 4 frames for one adjustment.
When the gains were updated by previous code, the registers for the gains
were updated only on new streaming start. Now, after each full histogram the
registers are updated with new gains.
Also, on previous code, if the streaming stopped but not all 3 histograms
finished, a new histogram was started either way. This used to lead to an
error "timeout to update profile" when streaming was stopped.
According to the hardware, histogram can only work together with the capture,
not independently.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

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This commit is contained in:

Eugen Hristev 2019-04-15 10:13:49 -04:00 • committed by Mauro Carvalho Chehab

parent a188339ca5

commit 73c1a577b8

2 changed files with 181 additions and 25 deletions

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6

drivers/media/platform/atmel/atmel-isc-regs.h

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200

drivers/media/platform/atmel/atmel-isc.c

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