From fc4432847866baf1d3ad3348cce976c0299be081 Mon Sep 17 00:00:00 2001 From: Jemma Denson Date: Tue, 19 May 2015 15:29:44 -0300 Subject: [media] cx24120: Convert read_ber to retrieve from cache Instead of reading BER again for DVBv3 call, use the value from the cache. Signed-off-by: Jemma Denson Signed-off-by: Patrick Boettcher Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb-frontends/cx24120.c | 22 ++++++++++++++-------- 1 file changed, 14 insertions(+), 8 deletions(-) (limited to 'drivers/media/dvb-frontends') diff --git a/drivers/media/dvb-frontends/cx24120.c b/drivers/media/dvb-frontends/cx24120.c index 2d46780..3fe9da2 100644 --- a/drivers/media/dvb-frontends/cx24120.c +++ b/drivers/media/dvb-frontends/cx24120.c @@ -152,6 +152,7 @@ struct cx24120_state { /* ber stats calulations */ u32 berw_usecs; + u32 ber_prev; unsigned long ber_jiffies_stats; }; @@ -338,12 +339,15 @@ static int cx24120_read_snr(struct dvb_frontend *fe, u16 *snr) static int cx24120_read_ber(struct dvb_frontend *fe, u32 *ber) { struct cx24120_state *state = fe->demodulator_priv; + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + + if (c->post_bit_error.stat[0].scale != FE_SCALE_COUNTER) { + *ber = 0; + return 0; + } - *ber = (cx24120_readreg(state, CX24120_REG_BER_HH) << 24) | - (cx24120_readreg(state, CX24120_REG_BER_HL) << 16) | - (cx24120_readreg(state, CX24120_REG_BER_LH) << 8) | - cx24120_readreg(state, CX24120_REG_BER_LL); - dev_dbg(&state->i2c->dev, "read BER index = %d\n", *ber); + *ber = c->post_bit_error.stat[0].uvalue - state->ber_prev; + state->ber_prev = c->post_bit_error.stat[0].uvalue; return 0; } @@ -661,9 +665,11 @@ static void cx24120_get_stats(struct cx24120_state *state) msecs = (state->berw_usecs + 500) / 1000; state->ber_jiffies_stats = jiffies + msecs_to_jiffies(msecs); - ret = cx24120_read_ber(fe, &ber); - if (ret != 0) - return; + ber = cx24120_readreg(state, CX24120_REG_BER_HH) << 24; + ber |= cx24120_readreg(state, CX24120_REG_BER_HL) << 16; + ber |= cx24120_readreg(state, CX24120_REG_BER_LH) << 8; + ber |= cx24120_readreg(state, CX24120_REG_BER_LL); + dev_dbg(&state->i2c->dev, "read BER index = %d\n", ber); c->post_bit_error.stat[0].scale = FE_SCALE_COUNTER; c->post_bit_error.stat[0].uvalue += ber; -- cgit v1.1