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>

3 files changed, 8 insertions, 1 deletions

diff --git a/drivers/media/dvb/dvb-usb/dib0700_devices.c b/drivers/media/dvb/dvb-usb/dib0700_devices.c
index 385ce1c0a934..e06acd1fecb6 100644
--- 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 73f59ab06c86..3aed0d433921 100644
--- 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 04a744938cca..da17345bf5bd 100644
--- 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;
 
 };