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Date: Wed, 12 Nov 2014 10:15:46 +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 3.14 076/203] media: ds3000: fix LNB supply voltage on Tevii S480 on initialization 3.14-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: -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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