On Thu, Jul 5, 2012 at 5:05 PM, Antti Palosaari <crope@xxxxxx> wrote: > > On 07/05/2012 05:16 PM, Mauro Carvalho Chehab wrote: >> >> Implement API support to return AFC frequency shift, as this device >> supports it. The only other driver that implements it is tda9887, >> and the frequency there is reported in Hz. So, use Hz also for this >> tuner. > > > What is AFC and why it is needed? > AFC is short for Automatic Frequency Control, by which a tuner automatically fine-tunes the frequency for the best reception, compensating for small offsets and oscillator frequency drift. This is however done automatically on the tuner, so its configuration is read-only. Aside from being a "nice to know" statistic, getting hold of the AFC frequency shift does as far as I know not have any practical uses related to properly operating the tuner. Regards, Bert -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
