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Date: Fri, 12 Dec 2014 06:14:25 +0000
From: Ben Hutchings <ben@...adent.org.uk>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC: akpm@...ux-foundation.org,
"Mauro Carvalho Chehab" <mchehab@....samsung.com>,
"Ulrich Eckhardt" <uli@...-eckhardt.de>,
"Ulrich Eckhardt" <uli-lirc@...-eckhardt.de>
Subject: [PATCH 3.2 100/164] [media] ds3000: fix LNB supply voltage on
Tevii S480 on initialization
3.2.65-rc1 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>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
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
@@ -925,6 +925,13 @@ 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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