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authorMauro Carvalho Chehab <mchehab@redhat.com>2013-01-24 10:25:16 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2013-01-24 14:28:14 -0200
commitd9b6f08a7f756d2d5105f5aaf23c326f41a0683b (patch)
treebf38863daa8cbf1e3728ec5d34924f0a04dd3627
parent313cf4efa40ef739199bd68a76f89f8a5224a541 (diff)
[media] mb86a20s: add a logic for post-BER measurement
The logic here is similar to the preBER. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
-rw-r--r--drivers/media/dvb-frontends/mb86a20s.c220
1 files changed, 196 insertions, 24 deletions
diff --git a/drivers/media/dvb-frontends/mb86a20s.c b/drivers/media/dvb-frontends/mb86a20s.c
index 7d4e9119632d..ed39ee13a5ad 100644
--- a/drivers/media/dvb-frontends/mb86a20s.c
+++ b/drivers/media/dvb-frontends/mb86a20s.c
@@ -104,13 +104,20 @@ static struct regdata mb86a20s_init[] = {
{ 0x50, 0xae }, { 0x51, 0xff },
{ 0x50, 0xaf }, { 0x51, 0xff },
- { 0x5e, 0x00 }, /* Turn off BER after Viterbi */
- { 0x50, 0xdc }, { 0x51, 0x01 },
- { 0x50, 0xdd }, { 0x51, 0xf4 },
- { 0x50, 0xde }, { 0x51, 0x01 },
- { 0x50, 0xdf }, { 0x51, 0xf4 },
- { 0x50, 0xe0 }, { 0x51, 0x01 },
- { 0x50, 0xe1 }, { 0x51, 0xf4 },
+ /*
+ * On this demod, post BER counts blocks. When the count reaches the
+ * value below, it collects the block error count. The block counters
+ * are initialized to 127 here. This warrants that all of them will be
+ * quickly calculated when device gets locked. As TMCC is parsed, the
+ * values will be adjusted later in the driver's code.
+ */
+ { 0x5e, 0x07 }, /* Turn on BER after Viterbi */
+ { 0x50, 0xdc }, { 0x51, 0x00 },
+ { 0x50, 0xdd }, { 0x51, 0x7f },
+ { 0x50, 0xde }, { 0x51, 0x00 },
+ { 0x50, 0xdf }, { 0x51, 0x7f },
+ { 0x50, 0xe0 }, { 0x51, 0x00 },
+ { 0x50, 0xe1 }, { 0x51, 0x7f },
/*
* On this demod, when the block count reaches the count below,
@@ -187,12 +194,13 @@ static struct regdata mb86a20s_reset_reception[] = {
{ 0x08, 0x00 },
};
-static struct regdata mb86a20s_vber_reset[] = {
- { 0x53, 0x00 }, /* VBER Counter reset */
+static struct regdata mb86a20s_per_ber_reset[] = {
+ { 0x53, 0x00 }, /* pre BER Counter reset */
{ 0x53, 0x07 },
-};
-static struct regdata mb86a20s_per_reset[] = {
+ { 0x5f, 0x00 }, /* post BER Counter reset */
+ { 0x5f, 0x07 },
+
{ 0x50, 0xb1 }, /* PER Counter reset */
{ 0x51, 0x07 },
{ 0x51, 0x00 },
@@ -731,6 +739,8 @@ static int mb86a20s_reset_counters(struct dvb_frontend *fe)
memset(&c->cnr, 0, sizeof(c->cnr));
memset(&c->pre_bit_error, 0, sizeof(c->pre_bit_error));
memset(&c->pre_bit_count, 0, sizeof(c->pre_bit_count));
+ memset(&c->post_bit_error, 0, sizeof(c->post_bit_error));
+ memset(&c->post_bit_count, 0, sizeof(c->post_bit_count));
memset(&c->block_error, 0, sizeof(c->block_error));
memset(&c->block_count, 0, sizeof(c->block_count));
@@ -739,13 +749,8 @@ static int mb86a20s_reset_counters(struct dvb_frontend *fe)
/* Clear status for most stats */
- /* BER counter reset */
- rc = mb86a20s_writeregdata(state, mb86a20s_vber_reset);
- if (rc < 0)
- goto err;
-
- /* MER, PER counter reset */
- rc = mb86a20s_writeregdata(state, mb86a20s_per_reset);
+ /* BER/PER counter reset */
+ rc = mb86a20s_writeregdata(state, mb86a20s_per_ber_reset);
if (rc < 0)
goto err;
@@ -915,7 +920,124 @@ static int mb86a20s_get_pre_ber(struct dvb_frontend *fe,
rc = mb86a20s_writereg(state, 0x53, val | (1 << layer));
}
+ return rc;
+}
+
+static int mb86a20s_get_post_ber(struct dvb_frontend *fe,
+ unsigned layer,
+ u32 *error, u32 *count)
+{
+ struct mb86a20s_state *state = fe->demodulator_priv;
+ u32 counter, collect_rate;
+ int rc, val;
+
+ dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
+
+ if (layer >= 3)
+ return -EINVAL;
+
+ /* Check if the BER measures are already available */
+ rc = mb86a20s_readreg(state, 0x60);
+ if (rc < 0)
+ return rc;
+
+ /* Check if data is available for that layer */
+ if (!(rc & (1 << layer))) {
+ dev_dbg(&state->i2c->dev,
+ "%s: post BER for layer %c is not available yet.\n",
+ __func__, 'A' + layer);
+ return -EBUSY;
+ }
+ /* Read Bit Error Count */
+ rc = mb86a20s_readreg(state, 0x64 + layer * 3);
+ if (rc < 0)
+ return rc;
+ *error = rc << 16;
+ rc = mb86a20s_readreg(state, 0x65 + layer * 3);
+ if (rc < 0)
+ return rc;
+ *error |= rc << 8;
+ rc = mb86a20s_readreg(state, 0x66 + layer * 3);
+ if (rc < 0)
+ return rc;
+ *error |= rc;
+
+ dev_dbg(&state->i2c->dev,
+ "%s: post bit error for layer %c: %d.\n",
+ __func__, 'A' + layer, *error);
+
+ /* Read Bit Count */
+ rc = mb86a20s_writereg(state, 0x50, 0xdc + layer * 2);
+ if (rc < 0)
+ return rc;
+ rc = mb86a20s_readreg(state, 0x51);
+ if (rc < 0)
+ return rc;
+ counter = rc << 8;
+ rc = mb86a20s_writereg(state, 0x50, 0xdd + layer * 2);
+ if (rc < 0)
+ return rc;
+ rc = mb86a20s_readreg(state, 0x51);
+ if (rc < 0)
+ return rc;
+ counter |= rc;
+ *count = counter * 204 * 8;
+
+ dev_dbg(&state->i2c->dev,
+ "%s: post bit count for layer %c: %d.\n",
+ __func__, 'A' + layer, *count);
+
+ /*
+ * As we get TMCC data from the frontend, we can better estimate the
+ * BER bit counters, in order to do the BER measure during a longer
+ * time. Use those data, if available, to update the bit count
+ * measure.
+ */
+
+ if (!state->estimated_rate[layer])
+ goto reset_measurement;
+
+ collect_rate = state->estimated_rate[layer] / 204 / 8;
+ if (collect_rate < 32)
+ collect_rate = 32;
+ if (collect_rate > 65535)
+ collect_rate = 65535;
+ if (collect_rate != counter) {
+ dev_dbg(&state->i2c->dev,
+ "%s: updating postBER counter on layer %c to %d.\n",
+ __func__, 'A' + layer, collect_rate);
+
+ /* Turn off BER after Viterbi */
+ rc = mb86a20s_writereg(state, 0x5e, 0x00);
+
+ /* Update counter for this layer */
+ rc = mb86a20s_writereg(state, 0x50, 0xdc + layer * 2);
+ if (rc < 0)
+ return rc;
+ rc = mb86a20s_writereg(state, 0x51, collect_rate >> 8);
+ if (rc < 0)
+ return rc;
+ rc = mb86a20s_writereg(state, 0x50, 0xdd + layer * 2);
+ if (rc < 0)
+ return rc;
+ rc = mb86a20s_writereg(state, 0x51, collect_rate & 0xff);
+ if (rc < 0)
+ return rc;
+
+ /* Turn on BER after Viterbi */
+ rc = mb86a20s_writereg(state, 0x5e, 0x07);
+
+ /* Reset all preBER counters */
+ rc = mb86a20s_writereg(state, 0x5f, 0x00);
+ if (rc < 0)
+ return rc;
+ rc = mb86a20s_writereg(state, 0x5f, 0x07);
+
+ return rc;
+ }
+
+reset_measurement:
/* Reset counter to collect new data */
rc = mb86a20s_readreg(state, 0x5f);
if (rc < 0)
@@ -924,7 +1046,7 @@ static int mb86a20s_get_pre_ber(struct dvb_frontend *fe,
rc = mb86a20s_writereg(state, 0x5f, val & ~(1 << layer));
if (rc < 0)
return rc;
- rc = mb86a20s_writereg(state, 0x5f, val);
+ rc = mb86a20s_writereg(state, 0x5f, val | (1 << layer));
return rc;
}
@@ -1417,6 +1539,8 @@ static void mb86a20s_stats_not_ready(struct dvb_frontend *fe)
c->cnr.len = 4;
c->pre_bit_error.len = 4;
c->pre_bit_count.len = 4;
+ c->post_bit_error.len = 4;
+ c->post_bit_count.len = 4;
c->block_error.len = 4;
c->block_count.len = 4;
@@ -1429,6 +1553,8 @@ static void mb86a20s_stats_not_ready(struct dvb_frontend *fe)
c->cnr.stat[i].scale = FE_SCALE_NOT_AVAILABLE;
c->pre_bit_error.stat[i].scale = FE_SCALE_NOT_AVAILABLE;
c->pre_bit_count.stat[i].scale = FE_SCALE_NOT_AVAILABLE;
+ c->post_bit_error.stat[i].scale = FE_SCALE_NOT_AVAILABLE;
+ c->post_bit_count.stat[i].scale = FE_SCALE_NOT_AVAILABLE;
c->block_error.stat[i].scale = FE_SCALE_NOT_AVAILABLE;
c->block_count.stat[i].scale = FE_SCALE_NOT_AVAILABLE;
}
@@ -1441,9 +1567,11 @@ static int mb86a20s_get_stats(struct dvb_frontend *fe)
int rc = 0, i;
u32 bit_error = 0, bit_count = 0;
u32 t_pre_bit_error = 0, t_pre_bit_count = 0;
+ u32 t_post_bit_error = 0, t_post_bit_count = 0;
u32 block_error = 0, block_count = 0;
u32 t_block_error = 0, t_block_count = 0;
- int active_layers = 0, ber_layers = 0, per_layers = 0;
+ int active_layers = 0, pre_ber_layers = 0, post_ber_layers = 0;
+ int per_layers = 0;
dev_dbg(&state->i2c->dev, "%s called.\n", __func__);
@@ -1457,7 +1585,6 @@ static int mb86a20s_get_stats(struct dvb_frontend *fe)
/* Layer is active and has rc segments */
active_layers++;
- /* Read per-layer BER */
/* Handle BER before vterbi */
rc = mb86a20s_get_pre_ber(fe, i,
&bit_error, &bit_count);
@@ -1479,7 +1606,30 @@ static int mb86a20s_get_stats(struct dvb_frontend *fe)
}
if (c->block_error.stat[1 + i].scale != FE_SCALE_NOT_AVAILABLE)
- ber_layers++;
+ pre_ber_layers++;
+
+ /* Handle BER post vterbi */
+ rc = mb86a20s_get_post_ber(fe, i,
+ &bit_error, &bit_count);
+ if (rc >= 0) {
+ c->post_bit_error.stat[1 + i].scale = FE_SCALE_COUNTER;
+ c->post_bit_error.stat[1 + i].uvalue += bit_error;
+ c->post_bit_count.stat[1 + i].scale = FE_SCALE_COUNTER;
+ c->post_bit_count.stat[1 + i].uvalue += bit_count;
+ } else if (rc != -EBUSY) {
+ /*
+ * If an I/O error happened,
+ * measures are now unavailable
+ */
+ c->post_bit_error.stat[1 + i].scale = FE_SCALE_NOT_AVAILABLE;
+ c->post_bit_count.stat[1 + i].scale = FE_SCALE_NOT_AVAILABLE;
+ dev_err(&state->i2c->dev,
+ "%s: Can't get BER for layer %c (error %d).\n",
+ __func__, 'A' + i, rc);
+ }
+
+ if (c->block_error.stat[1 + i].scale != FE_SCALE_NOT_AVAILABLE)
+ post_ber_layers++;
/* Handle Block errors for PER/UCB reports */
rc = mb86a20s_get_blk_error(fe, i,
@@ -1506,10 +1656,14 @@ static int mb86a20s_get_stats(struct dvb_frontend *fe)
if (c->block_error.stat[1 + i].scale != FE_SCALE_NOT_AVAILABLE)
per_layers++;
- /* Update total BER */
+ /* Update total preBER */
t_pre_bit_error += c->pre_bit_error.stat[1 + i].uvalue;
t_pre_bit_count += c->pre_bit_count.stat[1 + i].uvalue;
+ /* Update total postBER */
+ t_post_bit_error += c->post_bit_error.stat[1 + i].uvalue;
+ t_post_bit_count += c->post_bit_count.stat[1 + i].uvalue;
+
/* Update total PER */
t_block_error += c->block_error.stat[1 + i].uvalue;
t_block_count += c->block_count.stat[1 + i].uvalue;
@@ -1520,7 +1674,7 @@ static int mb86a20s_get_stats(struct dvb_frontend *fe)
* Start showing global count if at least one error count is
* available.
*/
- if (ber_layers) {
+ if (pre_ber_layers) {
/*
* At least one per-layer BER measure was read. We can now
* calculate the total BER
@@ -1534,6 +1688,24 @@ static int mb86a20s_get_stats(struct dvb_frontend *fe)
c->pre_bit_count.stat[0].uvalue = t_pre_bit_count;
}
+ /*
+ * Start showing global count if at least one error count is
+ * available.
+ */
+ if (post_ber_layers) {
+ /*
+ * At least one per-layer BER measure was read. We can now
+ * calculate the total BER
+ *
+ * Total Bit Error/Count is calculated as the sum of the
+ * bit errors on all active layers.
+ */
+ c->post_bit_error.stat[0].scale = FE_SCALE_COUNTER;
+ c->post_bit_error.stat[0].uvalue = t_post_bit_error;
+ c->post_bit_count.stat[0].scale = FE_SCALE_COUNTER;
+ c->post_bit_count.stat[0].uvalue = t_post_bit_count;
+ }
+
if (per_layers) {
/*
* At least one per-layer UCB measure was read. We can now

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