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

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commit 8c5bcded11 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>
This commit is contained in:
Ulrich Eckhardt
2014-10-10 14:19:12 -03:00
committed by Greg Kroah-Hartman
parent 7dbdd90186
commit f879c8cce0
1 changed files with 7 additions and 0 deletions
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7
drivers/media/dvb-frontends/ds3000.c
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@@ -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: