On 12/29/2012 01:42 AM, Mauro Carvalho Chehab wrote:
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.
I would like to questionable need of whole flag. Is there really need to separate FE_HAS_PARAMETERS from FE_HAS_LOCK as we are not still making the professional DTV analyzing equipment?
And on the other-hand, I don't see any change for DVB-core which syncs cache when FE_HAS_PARAMETERS is set. What I remember current behavior of DVB-core is to call get_frontend() after FE_HAS_LOCK is set and as that patch does not change it => there is likely implementation bug too.
regards Antti
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> --- Documentation/DocBook/media/dvb/frontend.xml | 13 ++++++++++++- drivers/media/dvb-frontends/mb86a20s.c | 17 ++++++++++------- include/uapi/linux/dvb/frontend.h | 4 ++++ 3 files changed, 26 insertions(+), 8 deletions(-) v3: rebase it to apply with current tip and add an implementation example. Obsoletes: http://patchwork.linuxtv.org/patch/13783/ diff --git a/Documentation/DocBook/media/dvb/frontend.xml b/Documentation/DocBook/media/dvb/frontend.xml index 426c252..5feff4e 100644 --- a/Documentation/DocBook/media/dvb/frontend.xml +++ b/Documentation/DocBook/media/dvb/frontend.xml @@ -216,6 +216,7 @@ 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: @@ -244,7 +245,17 @@ 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/drivers/media/dvb-frontends/mb86a20s.c b/drivers/media/dvb-frontends/mb86a20s.c index fade566..35153b6 100644 --- a/drivers/media/dvb-frontends/mb86a20s.c +++ b/drivers/media/dvb-frontends/mb86a20s.c @@ -333,19 +333,22 @@ static int mb86a20s_read_status(struct dvb_frontend *fe, fe_status_t *status) fe->ops.i2c_gate_ctrl(fe, 1); if (val >= 2) - *status |= FE_HAS_SIGNAL; + *status |= FE_HAS_SIGNAL; /* Tuner locked */ if (val >= 4) - *status |= FE_HAS_CARRIER; + *status |= FE_HAS_CARRIER; /* Mode reliably detected */ - if (val >= 5) - *status |= FE_HAS_VITERBI; + if (val >= 6) + *status |= FE_HAS_VITERBI; /* PLL locked and broadband detected */ if (val >= 7) - *status |= FE_HAS_SYNC; + *status |= FE_HAS_SYNC; /* Frame sync */ - if (val >= 8) /* Maybe 9? */ - *status |= FE_HAS_LOCK; + if (val >= 8) + *status |= FE_HAS_PARAMETERS; /* TMCC locked */ + + if (val >= 9) + *status |= FE_HAS_LOCK; /* TS output started */ dprintk("val = %d, status = 0x%02x\n", val, *status); diff --git a/include/uapi/linux/dvb/frontend.h b/include/uapi/linux/dvb/frontend.h index c12d452..e4daeee 100644 --- a/include/uapi/linux/dvb/frontend.h +++ b/include/uapi/linux/dvb/frontend.h @@ -132,6 +132,9 @@ 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 { @@ -142,6 +145,7 @@ 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 {
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