On Tuesday 17 January 2012 19:45:28 you wrote: > On ISDB-T, a few carriers are reserved for TMCC decoding > (1 to 20 carriers, depending on the mode). Those carriers > use the DBPSK modulation, and contain the information about > each of the three layers of carriers (modulation, partial > reception, inner code, interleaving, and number of segments). > > If the TMCC carrier was not locked and decoded, no information > would be provided by get_frontend(). So, instead of returning > false values, return -EAGAIN. > > Another alternative for this patch would be to add a flag to > fe_status (FE_HAS_GET_FRONTEND?), to indicate that the ISDB-T > TMCC carriers (and DVB-T TPS?), required for get_frontend > to work, are locked. > > Comments? I think it changes the behaviour of get_frontend too much and in fact transmission parameter signaling (TPS for DVB-T, TMCC for ISDB-T) locks are already or should be if not integrated to the status locks. Also those parameters can change over time and signal a "reconfiguration" of the transmission. So, for me I would vote against this kind of implementation in favor a better one. Unfortunately I don't have a much better idea at hand right now. -- Patrick Boettcher Kernel Labs Inc. http://www.kernellabs.com/ -- 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
