From ad976187040dd898daa7b6dcc44c03f79074d072 Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Sun, 15 Dec 2013 09:57:40 -0300 Subject: [PATCH] [media] dib8000: improves the auto search mode check logic The logic that detects if auto search mode should be used is too complex. Also, it doesn't cover all cases, as the dib8000_tune logic requires either auto mode or a fully specified manual mode. So, move it to a separate function and add some extra debug data to help identifying when it falled back to auto mode, because the manual settings are invalid. Signed-off-by: Mauro Carvalho Chehab Acked-by: Patrick Boettcher --- drivers/media/dvb-frontends/dib8000.c | 118 ++++++++++++++++++++------ 1 file changed, 90 insertions(+), 28 deletions(-) diff --git a/drivers/media/dvb-frontends/dib8000.c b/drivers/media/dvb-frontends/dib8000.c index 063232afecd6..f11c9f8f35b3 100644 --- a/drivers/media/dvb-frontends/dib8000.c +++ b/drivers/media/dvb-frontends/dib8000.c @@ -2873,6 +2873,91 @@ static int dib8090p_init_sdram(struct dib8000_state *state) return 0; } +/** + * is_manual_mode - Check if TMCC should be used for parameters settings + * @c: struct dvb_frontend_properties + * + * By default, TMCC table should be used for parameter settings on most + * usercases. However, sometimes it is desirable to lock the demod to + * use the manual parameters. + * + * On manual mode, the current dib8000_tune state machine is very restrict: + * It requires that both per-layer and per-transponder parameters to be + * properly specified, otherwise the device won't lock. + * + * Check if all those conditions are properly satisfied before allowing + * the device to use the manual frequency lock mode. + */ +static int is_manual_mode(struct dtv_frontend_properties *c) +{ + int i, n_segs = 0; + + /* Use auto mode on DVB-T compat mode */ + if (c->delivery_system != SYS_ISDBT) + return 0; + + /* + * Transmission mode is only detected on auto mode, currently + */ + if (c->transmission_mode == TRANSMISSION_MODE_AUTO) { + dprintk("transmission mode auto"); + return 0; + } + + /* + * Guard interval is only detected on auto mode, currently + */ + if (c->guard_interval == GUARD_INTERVAL_AUTO) { + dprintk("guard interval auto"); + return 0; + } + + /* + * If no layer is enabled, assume auto mode, as at least one + * layer should be enabled + */ + if (!c->isdbt_layer_enabled) { + dprintk("no layer modulation specified"); + return 0; + } + + /* + * Check if the per-layer parameters aren't auto and + * disable a layer if segment count is 0 or invalid. + */ + for (i = 0; i < 3; i++) { + if (!(c->isdbt_layer_enabled & 1 << i)) + continue; + + if ((c->layer[i].segment_count > 13) || + (c->layer[i].segment_count == 0)) { + c->isdbt_layer_enabled &= ~(1 << i); + continue; + } + + n_segs += c->layer[i].segment_count; + + if ((c->layer[i].modulation == QAM_AUTO) || + (c->layer[i].fec == FEC_AUTO)) { + dprintk("layer %c has either modulation or FEC auto", + 'A' + i); + return 0; + } + } + + /* + * Userspace specified a wrong number of segments. + * fallback to auto mode. + */ + if (n_segs == 0 || n_segs > 13) { + dprintk("number of segments is invalid"); + return 0; + } + + /* Everything looks ok for manual mode */ + return 1; +} + static int dib8000_tune(struct dvb_frontend *fe) { struct dib8000_state *state = fe->demodulator_priv; @@ -2901,37 +2986,14 @@ static int dib8000_tune(struct dvb_frontend *fe) if (state->revision == 0x8090) dib8090p_init_sdram(state); state->status = FE_STATUS_TUNE_PENDING; - if ((c->delivery_system != SYS_ISDBT) || - (c->inversion == INVERSION_AUTO) || - (c->transmission_mode == TRANSMISSION_MODE_AUTO) || - (c->guard_interval == GUARD_INTERVAL_AUTO) || - (((c->isdbt_layer_enabled & (1 << 0)) != 0) && - (c->layer[0].segment_count != 0xff) && - (c->layer[0].segment_count != 0) && - ((c->layer[0].modulation == QAM_AUTO) || - (c->layer[0].fec == FEC_AUTO))) || - (((c->isdbt_layer_enabled & (1 << 1)) != 0) && - (c->layer[1].segment_count != 0xff) && - (c->layer[1].segment_count != 0) && - ((c->layer[1].modulation == QAM_AUTO) || - (c->layer[1].fec == FEC_AUTO))) || - (((c->isdbt_layer_enabled & (1 << 2)) != 0) && - (c->layer[2].segment_count != 0xff) && - (c->layer[2].segment_count != 0) && - ((c->layer[2].modulation == QAM_AUTO) || - (c->layer[2].fec == FEC_AUTO))) || - (((c->layer[0].segment_count == 0) || - ((c->isdbt_layer_enabled & (1 << 0)) == 0)) && - ((c->layer[1].segment_count == 0) || - ((c->isdbt_layer_enabled & (2 << 0)) == 0)) && - ((c->layer[2].segment_count == 0) || ((c->isdbt_layer_enabled & (3 << 0)) == 0)))) - state->channel_parameters_set = 0; /* auto search */ - else - state->channel_parameters_set = 1; /* channel parameters are known */ + state->channel_parameters_set = is_manual_mode(c); + + dprintk("Tuning channel on %s search mode", + state->channel_parameters_set ? "manual" : "auto"); dib8000_viterbi_state(state, 0); /* force chan dec in restart */ - /* Layer monit */ + /* Layer monitor */ dib8000_write_word(state, 285, dib8000_read_word(state, 285) & 0x60); dib8000_set_frequency_offset(state); -- 2.34.1