linux-kernel - [PATCH 3.12 100/206] media: ds3000: fix LNB supply voltage on Tevii S480 on initialization

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Date:	Tue, 18 Nov 2014 15:07:35 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Ulrich Eckhardt <uli-lirc@...-eckhardt.de>,
	Ulrich Eckhardt <uli@...-eckhardt.de>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 100/206] media: ds3000: fix LNB supply voltage on Tevii S480 on initialization

From: Ulrich Eckhardt <uli-lirc@...-eckhardt.de>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

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: Jiri Slaby <jslaby@...e.cz>
---
 drivers/media/dvb-frontends/ds3000.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/media/dvb-frontends/ds3000.c b/drivers/media/dvb-frontends/ds3000.c
index 1e344b033277..22e8c2032f6d 100644
--- 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:
-- 
2.1.3

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