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V4L/DVB: au8522: fix case where we don't perform the first tune after going digital 

Address a problem found in MythTV where if we are in digital mode, switch to
analog mode, and the switch back to digital mode, the first tuning request
after switching back to digital mode gets dropped.  This is because the au8522
maintains internal state, and would think the demod was already tuned to the
target frequency.

Thanks to Zaphod Beeblebrox for reporting this issue.

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Devin Heitmueller 2010-02-17 22:51:46 -03:00 committed by Mauro Carvalho Chehab
parent 7f2c983cf5
commit b628a2a3d4
2 changed files with 10 additions and 0 deletions
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5
drivers/media/dvb/frontends/au8522_decoder.c
View File

@ -666,6 +666,11 @@ static int au8522_reset(struct v4l2_subdev *sd, u32 val)
state->operational_mode = AU8522_ANALOG_MODE;
/* Clear out any state associated with the digital side of the
chip, so that when it gets powered back up it won't think
that it is already tuned */
state->current_frequency = 0;
au8522_writereg(state, 0xa4, 1 << 5);
return 0;

5
drivers/media/dvb/frontends/au8522_dig.c
View File

@ -618,6 +618,11 @@ int au8522_init(struct dvb_frontend *fe)
state->operational_mode = AU8522_DIGITAL_MODE;
/* Clear out any state associated with the digital side of the
chip, so that when it gets powered back up it won't think
that it is already tuned */
state->current_frequency = 0;
au8522_writereg(state, 0xa4, 1 << 5);
au8522_i2c_gate_ctrl(fe, 1);