diff options
| author | Daniel Scheller <d.scheller@gmx.net> | 2017-12-20 11:29:48 -0500 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2018-03-05 14:58:30 -0500 |
| commit | 62474660fb2d92bb3f419769912517cccac2cf96 (patch) | |
| tree | e663694432ce5eb3c6057e94171c9d7f481a4ef2 /drivers/media | |
| parent | 76bf7087fb2118aee16370821975f8a58febf68a (diff) | |
media: dvb-frontend/mxl5xx: add support for physical layer scrambling
The MaxLinear MxL5xx has support for physical layer scrambling, which was
recently added to the DVB core via the new scrambling_sequence_index
property. Add required bits to the mxl5xx driver.
Picked up from dddvb master, commit 5c032058b9ba ("add support for PLS")
by Ralph Metzler <rjkm@metzlerbros.de>, adapted to the different naming
of the pls property (pls vs. scrambling_sequence_index).
Cc: Ralph Metzler <rjkm@metzlerbros.de>
Signed-off-by: Daniel Scheller <d.scheller@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/dvb-frontends/mxl5xx.c | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/drivers/media/dvb-frontends/mxl5xx.c b/drivers/media/dvb-frontends/mxl5xx.c index e899821018a0..483ee7d6198e 100644 --- a/drivers/media/dvb-frontends/mxl5xx.c +++ b/drivers/media/dvb-frontends/mxl5xx.c @@ -380,6 +380,38 @@ static int get_algo(struct dvb_frontend *fe) return DVBFE_ALGO_HW; } +static u32 gold2root(u32 gold) +{ + u32 x, g, tmp = gold; + + if (tmp >= 0x3ffff) + tmp = 0; + for (g = 0, x = 1; g < tmp; g++) + x = (((x ^ (x >> 7)) & 1) << 17) | (x >> 1); + return x; +} + +static int cfg_scrambler(struct mxl *state, u32 gold) +{ + u32 root; + u8 buf[26] = { + MXL_HYDRA_PLID_CMD_WRITE, 24, + 0, MXL_HYDRA_DEMOD_SCRAMBLE_CODE_CMD, 0, 0, + state->demod, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 1, 0, 0, 0, + }; + + root = gold2root(gold); + + buf[25] = (root >> 24) & 0xff; + buf[24] = (root >> 16) & 0xff; + buf[23] = (root >> 8) & 0xff; + buf[22] = root & 0xff; + + return send_command(state, sizeof(buf), buf); +} + static int cfg_demod_abort_tune(struct mxl *state) { struct MXL_HYDRA_DEMOD_ABORT_TUNE_T abort_tune_cmd; @@ -437,7 +469,7 @@ static int set_parameters(struct dvb_frontend *fe) demod_chan_cfg.roll_off = MXL_HYDRA_ROLLOFF_AUTO; demod_chan_cfg.modulation_scheme = MXL_HYDRA_MOD_AUTO; demod_chan_cfg.pilots = MXL_HYDRA_PILOTS_AUTO; - /* cfg_scrambler(state); */ + cfg_scrambler(state, p->scrambling_sequence_index); break; default: return -EINVAL; |