> add a new ops that will allow tuners to better report the > dB level of its AGC logic to the demod drivers. As the maximum > gain may vary from tuner to tuner, we'll be reversing the > logic here: instead of reporting the gain, let's report the > attenuation. This way, converting from it to the legacy DVBv3 > way is trivial. It is also easy to adjust the level of > the received signal to dBm, as it is just a matter of adding > an offset at the demod and/or at the bridge driver.
Mauro, Have you verified this work with a detailed spectrum analysis study? If so then please share. For example, by measuring the I/F out of various tuners in a mix of use cases, with and without the AGC being driven by any downstream demodulator? Also, taking into consideration any external LNA variance. I'm concerned that a tuner AGC Gain is a meaningless measurement and in practice demodulators don't actually care, and tuners don't implement their gain reporting capabilities correctly at all. This feels like a solution to a problem that doesn't exist. -- Steven Toth - Kernel Labs http://www.kernellabs.com +1.646.355.8490 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
