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[media] dib8000: improve block statistics

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PER/UCB statistics are collected once on each 1 second.
However, it doesn't provide the total number of packets
needed to calculate PER.

Yet, as we know the bit rate, it is possible to estimate
such number. So, do it.

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Acked-by: Patrick Boettcher <pboettcher@kernellabs.com>
This commit is contained in:
Mauro Carvalho Chehab 2013-12-17 11:34:22 -03:00
parent 704f01bbc7
commit 0400c5354a
1 changed files with 75 additions and 34 deletions
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109
drivers/media/dvb-frontends/dib8000.c
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@ -121,8 +121,9 @@ struct dib8000_state {
/* for DVBv5 stats */
s64 init_ucb;
unsigned long jiffies_stats;
unsigned long jiffies_stats_layer[3];
unsigned long per_jiffies_stats;
unsigned long ber_jiffies_stats;
unsigned long ber_jiffies_stats_layer[3];
#ifdef DIB8000_AGC_FREEZE
u16 agc1_max;
@ -1006,6 +1007,7 @@ static void dib8000_reset_stats(struct dvb_frontend *fe)
c->strength.len = 1;
c->cnr.len = 1;
c->block_error.len = 1;
c->block_count.len = 1;
c->post_bit_error.len = 1;
c->post_bit_count.len = 1;
@ -1014,15 +1016,17 @@ static void dib8000_reset_stats(struct dvb_frontend *fe)
c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
c->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
c->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
dib8000_read_unc_blocks(fe, &ucb);
state->init_ucb = -ucb;
state->jiffies_stats = 0;
memset(&state->jiffies_stats_layer, 0,
sizeof(state->jiffies_stats_layer));
state->ber_jiffies_stats = 0;
state->per_jiffies_stats = 0;
memset(&state->ber_jiffies_stats_layer, 0,
sizeof(state->ber_jiffies_stats_layer));
}
static int dib8000_reset(struct dvb_frontend *fe)
@ -4059,7 +4063,9 @@ static int dib8000_get_stats(struct dvb_frontend *fe, fe_status_t stat)
struct dib8000_state *state = fe->demodulator_priv;
struct dtv_frontend_properties *c = &state->fe[0]->dtv_property_cache;
int i;
u32 time_us, snr, val;
int show_per_stats = 0;
u32 time_us = 0, snr, val;
u64 blocks;
s32 db;
u16 strength;
@ -4074,6 +4080,7 @@ static int dib8000_get_stats(struct dvb_frontend *fe, fe_status_t stat)
/* UCB/BER/CNR measures require lock */
if (!(stat & FE_HAS_LOCK)) {
c->cnr.len = 1;
c->block_count.len = 1;
c->block_error.len = 1;
c->post_bit_error.len = 1;
c->post_bit_count.len = 1;
@ -4081,15 +4088,13 @@ static int dib8000_get_stats(struct dvb_frontend *fe, fe_status_t stat)
c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
c->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
c->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
return 0;
}
/* Check if time for stats was elapsed */
if (time_after(jiffies, state->jiffies_stats)) {
time_us = dib8000_get_time_us(fe, -1);
state->jiffies_stats = jiffies + msecs_to_jiffies((time_us + 500) / 1000);
dprintk("Next all layers stats available in %u us.\n", time_us);
if (time_after(jiffies, state->per_jiffies_stats)) {
state->per_jiffies_stats = jiffies + msecs_to_jiffies(1000);
/* Get SNR */
snr = dib8000_get_snr(fe);
@ -4108,7 +4113,34 @@ static int dib8000_get_stats(struct dvb_frontend *fe, fe_status_t stat)
c->cnr.stat[0].svalue = snr;
c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
/* Get UCB and post-BER measures */
/* Get UCB measures */
dib8000_read_unc_blocks(fe, &val);
if (val < state->init_ucb)
state->init_ucb += 0x100000000L;
c->block_error.stat[0].scale = FE_SCALE_COUNTER;
c->block_error.stat[0].uvalue = val + state->init_ucb;
/* Estimate the number of packets based on bitrate */
if (!time_us)
time_us = dib8000_get_time_us(fe, -1);
if (time_us) {
blocks = 1250000UL * 1000000UL;
do_div(blocks, time_us * 8 * 204);
c->block_count.stat[0].scale = FE_SCALE_COUNTER;
c->block_count.stat[0].uvalue += blocks;
}
show_per_stats = 1;
}
/* Get post-BER measures */
if (time_after(jiffies, state->ber_jiffies_stats)) {
time_us = dib8000_get_time_us(fe, -1);
state->ber_jiffies_stats = jiffies + msecs_to_jiffies((time_us + 500) / 1000);
dprintk("Next all layers stats available in %u us.", time_us);
dib8000_read_ber(fe, &val);
c->post_bit_error.stat[0].scale = FE_SCALE_COUNTER;
@ -4116,13 +4148,6 @@ static int dib8000_get_stats(struct dvb_frontend *fe, fe_status_t stat)
c->post_bit_count.stat[0].scale = FE_SCALE_COUNTER;
c->post_bit_count.stat[0].uvalue += 100000000;
dib8000_read_unc_blocks(fe, &val);
if (val < state->init_ucb)
state->init_ucb += 1L << 32;
c->block_error.stat[0].scale = FE_SCALE_COUNTER;
c->block_error.stat[0].uvalue = val + state->init_ucb;
}
if (state->revision < 0x8002)
@ -4133,27 +4158,43 @@ static int dib8000_get_stats(struct dvb_frontend *fe, fe_status_t stat)
c->post_bit_count.len = 4;
for (i = 0; i < 3; i++) {
if (!time_after(jiffies, state->jiffies_stats_layer[i]))
continue;
time_us = dib8000_get_time_us(fe, i);
if (!time_us)
unsigned nsegs = c->layer[i].segment_count;
if (nsegs == 0 || nsegs > 13)
continue;
state->jiffies_stats_layer[i] = jiffies + msecs_to_jiffies((time_us + 500) / 1000);
dprintk("Next layer %c stats will be available in %u us\n",
'A' + i, time_us);
time_us = 0;
val = dib8000_read_word(state, per_layer_regs[i].ber);
c->post_bit_error.stat[1 + i].scale = FE_SCALE_COUNTER;
c->post_bit_error.stat[1 + i].uvalue += val;
if (time_after(jiffies, state->ber_jiffies_stats_layer[i])) {
time_us = dib8000_get_time_us(fe, i);
c->post_bit_count.stat[1 + i].scale = FE_SCALE_COUNTER;
c->post_bit_count.stat[1 + i].uvalue += 100000000;
state->ber_jiffies_stats_layer[i] = jiffies + msecs_to_jiffies((time_us + 500) / 1000);
dprintk("Next layer %c stats will be available in %u us\n",
'A' + i, time_us);
val = dib8000_read_word(state, per_layer_regs[i].per);
val = dib8000_read_word(state, per_layer_regs[i].ber);
c->post_bit_error.stat[1 + i].scale = FE_SCALE_COUNTER;
c->post_bit_error.stat[1 + i].uvalue += val;
c->block_error.stat[1 + i].scale = FE_SCALE_COUNTER;
c->block_error.stat[1 + i].uvalue += val;
c->post_bit_count.stat[1 + i].scale = FE_SCALE_COUNTER;
c->post_bit_count.stat[1 + i].uvalue += 100000000;
}
if (show_per_stats) {
val = dib8000_read_word(state, per_layer_regs[i].per);
c->block_error.stat[1 + i].scale = FE_SCALE_COUNTER;
c->block_error.stat[1 + i].uvalue += val;
if (!time_us)
time_us = dib8000_get_time_us(fe, i);
if (time_us) {
blocks = 1250000UL * 1000000UL;
do_div(blocks, time_us * 8 * 204);
c->block_count.stat[0].scale = FE_SCALE_COUNTER;
c->block_count.stat[0].uvalue += blocks;
}
}
}
return 0;
}