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Commit 62474660 authored by Daniel Scheller's avatar Daniel Scheller Committed by Mauro Carvalho Chehab
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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: default avatarDaniel Scheller <d.scheller@gmx.net>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent 76bf7087

drivers/media/dvb-frontends/mxl5xx.c

+33 −1
Original line number Diff line number Diff line
@@ -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;