get_frontend() can't be called too early, as the device may not have it yet. Yet, get_frontend() on OFDM standards can happen before FE_HAS_LOCK, as the TMCC carriers (ISDB-T) or the TPS carriers (DVB-T) require a very low signal to noise relation to be detected. The other carriers use different modulations, so they require a higher SNR. Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> --- v2: rebase for patch at http://patchwork.linuxtv.org/patch/9562 --- Documentation/DocBook/media/dvb/frontend.xml | 13 ++++++++++++- include/linux/dvb/frontend.h | 4 ++++ 2 files changed, 16 insertions(+), 1 deletion(-) diff --git a/Documentation/DocBook/media/dvb/frontend.xml b/Documentation/DocBook/media/dvb/frontend.xml index 1ab2e1a..3c2b8c0 100644 --- a/Documentation/DocBook/media/dvb/frontend.xml +++ b/Documentation/DocBook/media/dvb/frontend.xml @@ -215,6 +215,7 @@ typedef enum fe_status { FE_HAS_LOCK = 0x10, FE_TIMEDOUT = 0x20, FE_REINIT = 0x40, + FE_HAS_PARAMETERS = 0x80, } fe_status_t; </programlisting> <para>to indicate the current state and/or state changes of the frontend hardware: @@ -243,7 +244,17 @@ typedef enum fe_status { <entry align="char">FE_REINIT</entry> <entry align="char">The frontend was reinitialized, application is recommended to reset DiSEqC, tone and parameters</entry> -</row> +</row><row> +<entry align="char">FE_HAS_PARAMETERS</entry> +<entry align="char"><link linkend="FE_GET_SET_PROPERTY"> +<constant>FE_GET_PROPERTY/FE_SET_PROPERTY</constant></link> or +<link linkend="FE_GET_FRONTEND"><constant>FE_GET_FRONTEND</constant></link> can now be +called to provide the detected network parameters. +This should be risen for example when the DVB-T TPS/ISDB-T TMCC is locked. +This status can be risen before FE_HAS_SYNC, as the SNR required for +parameters detection is lower than the requirement for the other +carriers on the OFDM delivery systems. +</entry></row> </tbody></tgroup></informaltable> </section> diff --git a/include/linux/dvb/frontend.h b/include/linux/dvb/frontend.h index bb51edf..8ff49c6 100644 --- a/include/linux/dvb/frontend.h +++ b/include/linux/dvb/frontend.h @@ -131,6 +131,9 @@ typedef enum fe_sec_mini_cmd { * @FE_TIMEDOUT: no lock within the last ~2 seconds * @FE_REINIT: frontend was reinitialized, application is recommended * to reset DiSEqC, tone and parameters + * @FE_HAS_PARAMETERS: get_frontend() can now be called to provide the + * detected network parameters. This should be risen + * for example when the DVB-T TPS/ISDB-T TMCC is locked. */ typedef enum fe_status { @@ -141,6 +144,7 @@ typedef enum fe_status { FE_HAS_LOCK = 0x10, FE_TIMEDOUT = 0x20, FE_REINIT = 0x40, + FE_HAS_PARAMETERS = 0x80, } fe_status_t; typedef enum fe_spectral_inversion { -- 1.7.11.2 -- 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
