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Subject[PATCH 3.10 049/123] media: ds3000: fix LNB supply voltage on Tevii S480 on initialization
3.10-stable review patch.  If anyone has any objections, please let me know.


From: Ulrich Eckhardt <>

commit 8c5bcded11cb607b1bb5920de3b9c882136d27db upstream.

The Tevii S480 outputs 18V on startup for the LNB supply voltage and does not
automatically power down. This blocks other receivers connected
to a satellite channel router (EN50494), since the receivers can not send the
required DiSEqC sequences when the Tevii card is connected to a the same SCR.

This patch switches off the LNB supply voltage on initialization of the frontend.

[ add a comment about why we're explicitly
turning off voltage at device init]
Signed-off-by: Ulrich Eckhardt <>
Signed-off-by: Mauro Carvalho Chehab <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/media/dvb-frontends/ds3000.c | 7 +++++++
1 file changed, 7 insertions(+)

--- a/drivers/media/dvb-frontends/ds3000.c
+++ b/drivers/media/dvb-frontends/ds3000.c
@@ -864,6 +864,13 @@ struct dvb_frontend *ds3000_attach(const
memcpy(&state->frontend.ops, &ds3000_ops,
sizeof(struct dvb_frontend_ops));
state->frontend.demodulator_priv = state;
+ /*
+ * Some devices like T480 starts with voltage on. Be sure
+ * to turn voltage off during init, as this can otherwise
+ * interfere with Unicable SCR systems.
+ */
+ ds3000_set_voltage(&state->frontend, SEC_VOLTAGE_OFF);
return &state->frontend;


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