[media] DiB8000: improve the tuning and the SNR monitoring

This patches improves the tuning of the dib8000 and correct the monitoringr
of the SNR.The patch allows to faster detect that there is no ISDB-T channel
on the wanted frequency.

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

diff --git a/drivers/media/dvb/frontends/dib8000.c b/drivers/media/dvb/frontends/dib8000.c
index fe284d5292f5422f16a846e1077c7df34c576098..96c6a61f5b06ce081d5e8c72a0ac8f2d8f92e4b4 100644 (file)
--- a/drivers/media/dvb/frontends/dib8000.c
+++ b/drivers/media/dvb/frontends/dib8000.c
@@ -2215,7 +2215,7 @@ static int dib8000_set_frontend(struct dvb_frontend *fe, struct dvb_frontend_par
                         ((state->fe[0]->dtv_property_cache.layer[1].segment_count == 0) ||
                          ((state->fe[0]->dtv_property_cache.isdbt_layer_enabled & (2 << 0)) == 0)) &&
                         ((state->fe[0]->dtv_property_cache.layer[2].segment_count == 0) || ((state->fe[0]->dtv_property_cache.isdbt_layer_enabled & (3 << 0)) == 0)))) {
-               int i = 80000;
+               int i = 100;
                u8 found = 0;
                u8 tune_failed = 0;
 
@@ -2243,6 +2243,7 @@ static int dib8000_set_frontend(struct dvb_frontend *fe, struct dvb_frontend_par
                                        default:
                                                 dprintk("unhandled autosearch result");
                                        case 1:
+                                                tune_failed |= (1 << index_frontend);
                                                 dprintk("autosearch failed for the frontend%i", index_frontend);
                                                 break;
                                        }
@@ -2401,7 +2402,7 @@ static int dib8000_read_snr(struct dvb_frontend *fe, u16 * snr)
        for (index_frontend = 1; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++)
                snr_master += dib8000_get_snr(state->fe[index_frontend]);
 
-       if (snr_master != 0) {
+       if ((snr_master >> 16) != 0) {
                snr_master = 10*intlog10(snr_master>>16);
                *snr = snr_master / ((1 << 24) / 10);
        }