V4L/DVB: dib7000p: add disable sample and hold, and diversity delay parameter

This patch improves the overall driver performance in
diversity-reception scenarios.

Signed-off-by: Olivier Grenie <olivier.grenie@dibcom.fr>
Signed-off-by: Patrick Boettcher <patrick.boettcher@dibcom.fr>
Cc: stable@kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/dvb/dvb-usb/dib0700_devices.c b/drivers/media/dvb/dvb-usb/dib0700_devices.c
index 385ce1c..e06acd1 100644 (file)
--- a/drivers/media/dvb/dvb-usb/dib0700_devices.c
+++ b/drivers/media/dvb/dvb-usb/dib0700_devices.c
@@ -956,6 +956,7 @@ static struct dib7000p_config dib7770p_dib7000p_config = {
 
        .hostbus_diversity = 1,
        .enable_current_mirror = 1,
+       .disable_sample_and_hold = 0,
 };
 
 static int stk7770p_frontend_attach(struct dvb_usb_adapter *adap)

diff --git a/drivers/media/dvb/frontends/dib7000p.c b/drivers/media/dvb/frontends/dib7000p.c
index 73f59ab..3aed0d4 100644 (file)
--- a/drivers/media/dvb/frontends/dib7000p.c
+++ b/drivers/media/dvb/frontends/dib7000p.c
@@ -260,6 +260,7 @@ static void dib7000p_set_adc_state(struct dib7000p_state *state, enum dibx000_ad
 
 //     dprintk( "908: %x, 909: %x\n", reg_908, reg_909);
 
+       reg_909 |= (state->cfg.disable_sample_and_hold & 1) << 4;
        reg_908 |= (state->cfg.enable_current_mirror & 1) << 7;
 
        dib7000p_write_word(state, 908, reg_908);
@@ -780,7 +781,10 @@ static void dib7000p_set_channel(struct dib7000p_state *state, struct dvb_fronte
                default:
                case GUARD_INTERVAL_1_32: value *= 1; break;
        }
-       state->div_sync_wait = (value * 3) / 2 + 32; // add 50% SFN margin + compensate for one DVSY-fifo TODO
+       if (state->cfg.diversity_delay == 0)
+               state->div_sync_wait = (value * 3) / 2 + 48; // add 50% SFN margin + compensate for one DVSY-fifo
+       else
+               state->div_sync_wait = (value * 3) / 2 + state->cfg.diversity_delay; // add 50% SFN margin + compensate for one DVSY-fifo
 
        /* deactive the possibility of diversity reception if extended interleaver */
        state->div_force_off = !1 && ch->u.ofdm.transmission_mode != TRANSMISSION_MODE_8K;

diff --git a/drivers/media/dvb/frontends/dib7000p.h b/drivers/media/dvb/frontends/dib7000p.h
index 04a7449..da17345 100644 (file)
--- a/drivers/media/dvb/frontends/dib7000p.h
+++ b/drivers/media/dvb/frontends/dib7000p.h
@@ -33,8 +33,10 @@ struct dib7000p_config {
        int (*agc_control) (struct dvb_frontend *, u8 before);
 
        u8 output_mode;
+       u8 disable_sample_and_hold : 1;
 
        u8 enable_current_mirror : 1;
+       u8 diversity_delay;
 
 };