linux-kernel - [PATCH 3.10 049/123] media: ds3000: fix LNB supply voltage on Tevii S480 on initialization

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Message-Id: <20141112011721.259362232@linuxfoundation.org>
Date:	Wed, 12 Nov 2014 10:16:55 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Ulrich Eckhardt <uli@...-eckhardt.de>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>
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 <uli-lirc@...-eckhardt.de>

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

---
 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;
 
 error3:


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