The following patch addresses an condition where the dvb_frontend
attempts to power down the tuner, but there is no guarantee that the
gate is open at that phase (in fact, in a properly written demod it
should have been closed at this phase).
Tested on the HVR-950Q.
Regards,
Devin
--
Devin J. Heitmueller
http://www.devinheitmueller.com
AIM: devinheitmueller
Open the i2c gate before issuing attempting to put the tuner to sleep
From: Devin Heitmueller <devin.heitmueller@xxxxxxxxx>
It is not safe to assume that the i2c gate will be open before issuing the
command to power down the tuner. In fact, many demods only open the gate
long enough to issue the tuning command.
This fix allows power management to work properly for those tuners behind an
i2c gate (in my case the problem was with the HVR-950Q)
Signed-off-by: Devin Heitmueller <devin.heitmueller@xxxxxxxxx>
Index: v4l-dvb/linux/drivers/media/dvb/dvb-core/dvb_frontend.c
===================================================================
--- v4l-dvb.orig/linux/drivers/media/dvb/dvb-core/dvb_frontend.c 2008-11-15 19:37:15.000000000 -0500
+++ v4l-dvb/linux/drivers/media/dvb/dvb-core/dvb_frontend.c 2008-11-15 19:37:51.000000000 -0500
@@ -656,6 +656,8 @@
if (fe->ops.set_voltage)
fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
if (fe->ops.tuner_ops.sleep) {
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 1);
fe->ops.tuner_ops.sleep(fe);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
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