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V4L/DVB (9634): Make sure the i2c gate is open before powering down tuner

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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@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Devin Heitmueller 2008-11-16 00:44:52 -03:00 committed by Mauro Carvalho Chehab
parent 3f9b46c154
commit 41286d9725
1 changed files with 2 additions and 0 deletions
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2
drivers/media/dvb/dvb-core/dvb_frontend.c
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@ -585,6 +585,8 @@ restart:
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);