diff options
Diffstat (limited to 'include/media/tuner-types.h')
| -rw-r--r-- | include/media/tuner-types.h | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/include/media/tuner-types.h b/include/media/tuner-types.h index 64b16b1f1926..15821ab14a9e 100644 --- a/include/media/tuner-types.h +++ b/include/media/tuner-types.h @@ -19,6 +19,25 @@ struct tuner_range { struct tuner_params { enum param_type type; + /* Many Philips based tuners have a comment like this in their + * datasheet: + * + * For channel selection involving band switching, and to ensure + * smooth tuning to the desired channel without causing + * unnecessary charge pump action, it is recommended to consider + * the difference between wanted channel frequency and the + * current channel frequency. Unnecessary charge pump action + * will result in very low tuning voltage which may drive the + * oscillator to extreme conditions. + * + * Set cb_first_if_lower_freq to 1, if this check is + * required for this tuner. + * + * I tested this for PAL by first setting the TV frequency to + * 203 MHz and then switching to 96.6 MHz FM radio. The result was + * static unless the control byte was sent first. + */ + unsigned int cb_first_if_lower_freq:1; unsigned char config; /* to be moved into struct tuner_range for dvb-pll merge */ unsigned int count; @@ -27,7 +46,6 @@ struct tuner_params { struct tunertype { char *name; - unsigned int has_tda988x:1; struct tuner_params *params; }; |