media: ds3000: fix LNB supply voltage on Tevii S480 on initialization

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.

[mchehab@osg.samsung.com: add a comment about why we're explicitly
 turning off voltage at device init]
Signed-off-by: Ulrich Eckhardt <uli@uli-eckhardt.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/media/dvb-frontends/ds3000.c b/drivers/media/dvb-frontends/ds3000.c
index 1e344b033277c3ccf362b163aa3069f431327346..22e8c2032f6d8280d2e302fe2b21baadd3f127eb 100644 (file)
--- a/drivers/media/dvb-frontends/ds3000.c
+++ b/drivers/media/dvb-frontends/ds3000.c
@@ -864,6 +864,13 @@ struct dvb_frontend *ds3000_attach(const struct ds3000_config *config,
        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;
 
 error3: