From 3aa5fe9222c1524c635ed9e71d873ca2cf308a61 Mon Sep 17 00:00:00 2001 From: Malcolm Priestley Date: Tue, 25 Feb 2014 23:11:34 -0300 Subject: media: m88rs2000: prevent frontend crash on continuous transponder scans commit 8272d0a0c0d374a01721e579df6e8add5577132b upstream. Add m88rs2000_get_tune_settings, min delay of 2000 ms on symbol rate more than 3000000 and delay of 3000ms less than this. Adding min delay prevents crashing the frontend on continuous transponder scans. Other dvb_frontend_tune_settings remain as default. This makes very little time difference to good channel scans, but slows down the set frontend where lock can never be achieved i.e. DVB-S2. Signed-off-by: Malcolm Priestley Signed-off-by: Michael Krufky Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman --- drivers/media/dvb-frontends/m88rs2000.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'drivers/media') diff --git a/drivers/media/dvb-frontends/m88rs2000.c b/drivers/media/dvb-frontends/m88rs2000.c index b2351466b0da..807cf6d7e234 100644 --- a/drivers/media/dvb-frontends/m88rs2000.c +++ b/drivers/media/dvb-frontends/m88rs2000.c @@ -715,6 +715,22 @@ static int m88rs2000_get_frontend(struct dvb_frontend *fe) return 0; } +static int m88rs2000_get_tune_settings(struct dvb_frontend *fe, + struct dvb_frontend_tune_settings *tune) +{ + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + + if (c->symbol_rate > 3000000) + tune->min_delay_ms = 2000; + else + tune->min_delay_ms = 3000; + + tune->step_size = c->symbol_rate / 16000; + tune->max_drift = c->symbol_rate / 2000; + + return 0; +} + static int m88rs2000_i2c_gate_ctrl(struct dvb_frontend *fe, int enable) { struct m88rs2000_state *state = fe->demodulator_priv; @@ -766,6 +782,7 @@ static struct dvb_frontend_ops m88rs2000_ops = { .set_frontend = m88rs2000_set_frontend, .get_frontend = m88rs2000_get_frontend, + .get_tune_settings = m88rs2000_get_tune_settings, }; struct dvb_frontend *m88rs2000_attach(const struct m88rs2000_config *config, -- cgit v1.2.3