media: vidtv: adjust signal strength range

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On real devices, signal strength is always a negative
number when represented in dBm. A more interesting
range is to use dBmV (which is what Kaffeine does,
for example). The conversion from the two units are
simple:

	dBmV = dBm - 108

Usually, signal strength ranges up to 100dBmV. Adjust the
maximum value to be around 74 dBmV, when there's no
frequency shift, which represents a good signal.

With that, Kaffeine displays it a lot better.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

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Mauro Carvalho Chehab 2020-09-14 15:17:18 +02:00

parent 9cf8572d6b

commit d859a712a3

1 changed files with 9 additions and 3 deletions

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drivers/media/test-drivers/vidtv/vidtv_demod.c

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