V4L/DVB (13974): [STV090x] Fix locking reliabilty issues in automatic mode.

In automatic S/S2 detection mode, locking of a DVB-S transponder could
fail when coming from a DVB-S2 transponder. This change fixes the issue
by first disabling DVB-S and DVB-S2 mode before enabling it again.

Signed-off-by: Andreas Regel <andreas.regel@gmx.de>
Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/media/dvb/frontends/stv090x.c b/drivers/media/dvb/frontends/stv090x.c
index 1573466a5c74..e57581d14ccb 100644
--- a/drivers/media/dvb/frontends/stv090x.c
+++ b/drivers/media/dvb/frontends/stv090x.c
@@ -1246,6 +1246,10 @@ static int stv090x_delivery_search(struct stv090x_state *state)
         default:
                 /* enable DVB-S2 and DVB-S2 in Auto MODE */
                 reg = STV090x_READ_DEMOD(state, DMDCFGMD);
+                STV090x_SETFIELD_Px(reg, DVBS1_ENABLE_FIELD, 0);
+                STV090x_SETFIELD_Px(reg, DVBS2_ENABLE_FIELD, 0);
+                if (STV090x_WRITE_DEMOD(state, DMDCFGMD, reg) < 0)
+                        goto err;
                 STV090x_SETFIELD_Px(reg, DVBS1_ENABLE_FIELD, 1);
                 STV090x_SETFIELD_Px(reg, DVBS2_ENABLE_FIELD, 1);
                 if (STV090x_WRITE_DEMOD(state, DMDCFGMD, reg) < 0)