From: Daniel Scheller <[email protected]>
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 <[email protected]>, adapted to the different naming
of the pls property (pls vs. scrambling_sequence_index).
Cc: Ralph Metzler <[email protected]>
Signed-off-by: Daniel Scheller <[email protected]>
---
NB, I'm also prepping up another set of patches that enable the stv0910
driver to handle the recently added PLS support.
drivers/media/dvb-frontends/mxl5xx.c | 34 +++++++++++++++++++++++++++++++++-
1 file changed, 33 insertions(+), 1 deletion(-)
diff --git a/drivers/media/dvb-frontends/mxl5xx.c
b/drivers/media/dvb-frontends/mxl5xx.c
index 1ebc3830579f..05f27f51fd03 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;
--
2.13.6
