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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>
This commit is contained in:
Daniel Scheller 2017-12-20 11:29:48 -05:00 committed by Mauro Carvalho Chehab
parent 76bf7087fb
commit 62474660fb
1 changed files with 33 additions and 1 deletions
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34
drivers/media/dvb-frontends/mxl5xx.c
View File

@ -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;