tree cddcc0b21f2d36236e3211a612e9cb0d79365843
parent 82e67246cd2a860637ee9d27776ad48d32734f6c
author Trent Piepho <xyzzy@speakeasy.org> 1187340622 -0300
committer Mauro Carvalho Chehab <mchehab@infradead.org> 1191978321 -0300

V4L/DVB (6034): cx88: Add parameter to control radio deemphasis time constant

FM radio transmission use a preemphasis/deemphasis scheme to reduce
high-frequency noise.  The cx88 audio decoder is supposedly set to no
deemphasis by the current driver.

However, the "no deemphasis" setting doesn't work.  On my chip, cx23883, it
produces the same result as the 75 us time constant.  Maybe the default
settings on the cx23881 are for 50 us?

Since the deemphasis time constant varies by country, allow setting it via a
module parameter.

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>