[linux-dvb] [PATCH] Frontend or51211 - fixes SNR and signal strength

Trent Piepho xyzzy at speakeasy.org
Mon Nov 20 22:42:10 CET 2006

On Sat, 18 Nov 2006, Rusty Scott wrote:
> The attached patch makes changes to the or51211 frontend to match the SNR and
> signal strength methods in the lgdt330x frontend.  It removes an embedded log
> function in favor of using the functions in dvb_math.  Do not confuse this patch
> with the patch just posted for the or51132 frontend.  I'm not sure why 'make

I've fixed up the patches a bit and put them into my repository,
http://linuxtv.org/hg/~tap/v4l-dvb  Does everything still look ok?

I've tested the or51132 patch and it seems to work ok with 8-vsb.  I
haven't been able to test the or51211 patch.  I'm not sure how much testing
it got before, as it didn't compile.

I'd like to verify a couple things.  For the or51211, the error register is
only 8 bits?  In the or51132 it's 16 bits.

The or51211 patch removed a msleep(3) that appears between most of the i2c
transactions.  Is this ok?

The or51132 patch removed some msleep(30) calls too.  I added those back in
since the rest of the code had them.  Is there anything in the datasheet to
suggest that these are necessary?  i.e. after selecting a register you must
wait 30 ms before trying to read it?  I wonder if all those msleeps() can
be removed.

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