Acked-by: Abylay Ospan <aospan@xxxxxxxx> 2017-06-25 6:02 GMT-04:00 Daniel Scheller <d.scheller.oss@xxxxxxxxx>: > From: Daniel Scheller <d.scheller@xxxxxxx> > > When the demod driver puts the demod into sleep or shutdown state and it's > status is then polled e.g. via "dvb-fe-tool -m", i2c errors are printed > to the kernel log. If the last delsys was DVB-T/T2: > > cxd2841er: i2c wr failed=-5 addr=6c reg=00 len=1 > cxd2841er: i2c rd failed=-5 addr=6c reg=26 > > and if it was DVB-C: > > cxd2841er: i2c wr failed=-5 addr=6c reg=00 len=1 > cxd2841er: i2c rd failed=-5 addr=6c reg=49 > > This happens when read_status unconditionally calls into the > read_signal_strength() function which triggers the read_agc_gain_*() > functions, where these registered are polled. > > This isn't a critical thing since when the demod is active again, no more > such errors are logged, however this might make users suspecting defects. > > Fix this by requiring STATE_ACTIVE_* in priv->state. If it isn't in any > active state, additionally set the strength scale to NOT_AVAILABLE. > > Signed-off-by: Daniel Scheller <d.scheller@xxxxxxx> > --- > V2/follow-up to https://patchwork.linuxtv.org/patch/42061/, changed as > requested. Tested, working fine (ie. no "false" i2c failures). > > drivers/media/dvb-frontends/cxd2841er.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/media/dvb-frontends/cxd2841er.c b/drivers/media/dvb-frontends/cxd2841er.c > index 08f67d60a7d9..12bff778c97f 100644 > --- a/drivers/media/dvb-frontends/cxd2841er.c > +++ b/drivers/media/dvb-frontends/cxd2841er.c > @@ -3279,7 +3279,10 @@ static int cxd2841er_get_frontend(struct dvb_frontend *fe, > else if (priv->state == STATE_ACTIVE_TC) > cxd2841er_read_status_tc(fe, &status); > > - cxd2841er_read_signal_strength(fe); > + if (priv->state == STATE_ACTIVE_TC || priv->state == STATE_ACTIVE_S) > + cxd2841er_read_signal_strength(fe); > + else > + p->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE; > > if (status & FE_HAS_LOCK) { > cxd2841er_read_snr(fe); > -- > 2.13.0 > -- Abylay Ospan, NetUP Inc. http://www.netup.tv
