[media] drxk: Add pre/post BER and PER/UCB stats

The original az6007 driver has the code to calculate such
stats. Add it to the driver, reporting them via DVBv5
stats API.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/dvb-frontends/drxk_hard.c b/drivers/media/dvb-frontends/drxk_hard.c
index 0e40832..8c4de7c 100644 (file)
--- a/drivers/media/dvb-frontends/drxk_hard.c
+++ b/drivers/media/dvb-frontends/drxk_hard.c
@@ -2655,11 +2655,6 @@ static int GetDVBTSignalToNoise(struct drxk_state *state,
                c = Log10Times100(SqrErrIQ);
 
                iMER = a + b;
-               /* No negative MER, clip to zero */
-               if (iMER > c)
-                       iMER -= c;
-               else
-                       iMER = 0;
        }
        *pSignalToNoise = iMER;
 
@@ -6380,31 +6375,165 @@ static int drxk_set_parameters(struct dvb_frontend *fe)
        fe->ops.tuner_ops.get_if_frequency(fe, &IF);
        Start(state, 0, IF);
 
+       /* After set_frontend, stats aren't avaliable */
+       p->strength.stat[0].scale = FE_SCALE_RELATIVE;
+       p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       p->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       p->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       p->pre_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       p->pre_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       p->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       p->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+
        /* printk(KERN_DEBUG "drxk: %s IF=%d done\n", __func__, IF); */
 
        return 0;
 }
 
-static int drxk_read_status(struct dvb_frontend *fe, fe_status_t *status)
+static int drxk_get_stats(struct dvb_frontend *fe)
 {
+       struct dtv_frontend_properties *c = &fe->dtv_property_cache;
        struct drxk_state *state = fe->demodulator_priv;
+       int status;
        u32 stat;
-
-       dprintk(1, "\n");
+       u16 reg16;
+       u32 post_bit_count;
+       u32 post_bit_err_count;
+       u32 post_bit_error_scale;
+       u32 pre_bit_err_count;
+       u32 pre_bit_count;
+       u32 pkt_count;
+       u32 pkt_error_count;
+       s32 cnr, gain;
 
        if (state->m_DrxkState == DRXK_NO_DEV)
                return -ENODEV;
        if (state->m_DrxkState == DRXK_UNINITIALIZED)
                return -EAGAIN;
 
-       *status = 0;
+       /* get status */
+       state->fe_status = 0;
        GetLockStatus(state, &stat, 0);
        if (stat == MPEG_LOCK)
-               *status |= 0x1f;
+               state->fe_status |= 0x1f;
        if (stat == FEC_LOCK)
-               *status |= 0x0f;
+               state->fe_status |= 0x0f;
        if (stat == DEMOD_LOCK)
-               *status |= 0x07;
+               state->fe_status |= 0x07;
+
+       if (stat >= DEMOD_LOCK) {
+               GetSignalToNoise(state, &cnr);
+               c->cnr.stat[0].svalue = cnr * 100;
+               c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
+       } else {
+               c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       }
+
+       if (stat < FEC_LOCK) {
+               c->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+               c->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+               c->pre_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+               c->pre_bit_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;
+               return 0;
+       }
+
+       /* Get post BER */
+
+       /* BER measurement is valid if at least FEC lock is achieved */
+
+       /* OFDM_EC_VD_REQ_SMB_CNT__A and/or OFDM_EC_VD_REQ_BIT_CNT can be written
+               to set nr of symbols or bits over which
+               to measure EC_VD_REG_ERR_BIT_CNT__A . See CtrlSetCfg(). */
+
+       /* Read registers for post/preViterbi BER calculation */
+       status = read16(state, OFDM_EC_VD_ERR_BIT_CNT__A, &reg16);
+       if (status < 0)
+               goto error;
+       pre_bit_err_count = reg16;
+
+       status = read16(state, OFDM_EC_VD_IN_BIT_CNT__A , &reg16);
+       if (status < 0)
+               goto error;
+       pre_bit_count = reg16;
+
+       /* Number of bit-errors */
+       status = read16(state, FEC_RS_NR_BIT_ERRORS__A, &reg16);
+       if (status < 0)
+               goto error;
+       post_bit_err_count = reg16;
+
+       status = read16(state, FEC_RS_MEASUREMENT_PRESCALE__A, &reg16);
+       if (status < 0)
+               goto error;
+       post_bit_error_scale = reg16;
+
+       status = read16(state, FEC_RS_MEASUREMENT_PERIOD__A, &reg16);
+       if (status < 0)
+               goto error;
+       pkt_count = reg16;
+
+       status = read16(state, SCU_RAM_FEC_ACCUM_PKT_FAILURES__A, &reg16);
+       if (status < 0)
+               goto error;
+       pkt_error_count = reg16;
+       write16(state, SCU_RAM_FEC_ACCUM_PKT_FAILURES__A, 0);
+
+       post_bit_err_count *= post_bit_error_scale;
+
+       post_bit_count = pkt_count * 204 * 8;
+
+       /* Store the results */
+       c->block_error.stat[0].scale = FE_SCALE_COUNTER;
+       c->block_error.stat[0].uvalue += pkt_error_count;
+       c->block_count.stat[0].scale = FE_SCALE_COUNTER;
+       c->block_count.stat[0].uvalue += pkt_count;
+
+       c->pre_bit_error.stat[0].scale = FE_SCALE_COUNTER;
+       c->pre_bit_error.stat[0].uvalue += pre_bit_err_count;
+       c->pre_bit_count.stat[0].scale = FE_SCALE_COUNTER;
+       c->pre_bit_count.stat[0].uvalue += pre_bit_count;
+
+       c->post_bit_error.stat[0].scale = FE_SCALE_COUNTER;
+       c->post_bit_error.stat[0].uvalue += post_bit_err_count;
+       c->post_bit_count.stat[0].scale = FE_SCALE_COUNTER;
+       c->post_bit_count.stat[0].uvalue += post_bit_count;
+
+       /*
+        * Read AGC gain
+        *
+        * IFgain = (IQM_AF_AGC_IF__A * 26.75) (nA)
+        */
+       status = read16(state, IQM_AF_AGC_IF__A, &reg16);
+       if (status < 0) {
+               printk(KERN_ERR "drxk: Error %d on %s\n", status, __func__);
+               return status;
+       }
+       gain = 2675 * (reg16 - DRXK_AGC_DAC_OFFSET) / 100;
+
+       /* FIXME: it makes sense to fix the scale here to dBm */
+       c->strength.stat[0].scale = FE_SCALE_RELATIVE;
+       c->strength.stat[0].uvalue = gain;
+
+error:
+       return status;
+}
+
+
+static int drxk_read_status(struct dvb_frontend *fe, fe_status_t *status)
+{
+       struct drxk_state *state = fe->demodulator_priv;
+       int rc;
+
+       dprintk(1, "\n");
+
+       rc = drxk_get_stats(fe);
+       if (rc < 0)
+               return rc;
+
+       *status = state->fe_status;
+
        return 0;
 }
 
@@ -6439,6 +6568,10 @@ static int drxk_read_snr(struct dvb_frontend *fe, u16 *snr)
                return -EAGAIN;
 
        GetSignalToNoise(state, &snr2);
+
+       /* No negative SNR, clip to zero */
+       if (snr2 < 0)
+               snr2 = 0;
        *snr = snr2 & 0xffff;
        return 0;
 }
@@ -6522,6 +6655,7 @@ static struct dvb_frontend_ops drxk_ops = {
 struct dvb_frontend *drxk_attach(const struct drxk_config *config,
                                 struct i2c_adapter *i2c)
 {
+       struct dtv_frontend_properties *p;
        struct drxk_state *state = NULL;
        u8 adr = config->adr;
        int status;
@@ -6602,6 +6736,27 @@ struct dvb_frontend *drxk_attach(const struct drxk_config *config,
        } else if (init_drxk(state) < 0)
                goto error;
 
+
+       /* Initialize stats */
+       p = &state->frontend.dtv_property_cache;
+       p->strength.len = 1;
+       p->cnr.len = 1;
+       p->block_error.len = 1;
+       p->block_count.len = 1;
+       p->pre_bit_error.len = 1;
+       p->pre_bit_count.len = 1;
+       p->post_bit_error.len = 1;
+       p->post_bit_count.len = 1;
+
+       p->strength.stat[0].scale = FE_SCALE_RELATIVE;
+       p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       p->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       p->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       p->pre_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       p->pre_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       p->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+       p->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+
        printk(KERN_INFO "drxk: frontend initialized.\n");
        return &state->frontend;
 

diff --git a/drivers/media/dvb-frontends/drxk_hard.h b/drivers/media/dvb-frontends/drxk_hard.h
index d18a896..b8424f1 100644 (file)
--- a/drivers/media/dvb-frontends/drxk_hard.h
+++ b/drivers/media/dvb-frontends/drxk_hard.h
@@ -345,6 +345,8 @@ struct drxk_state {
        bool    antenna_dvbt;
        u16     antenna_gpio;
 
+       fe_status_t fe_status;
+
        /* Firmware */
        const char *microcode_name;
        struct completion fw_wait_load;

diff --git a/drivers/media/dvb-frontends/drxk_map.h b/drivers/media/dvb-frontends/drxk_map.h
index 23e16c1..761613f 100644 (file)
--- a/drivers/media/dvb-frontends/drxk_map.h
+++ b/drivers/media/dvb-frontends/drxk_map.h
@@ -10,6 +10,7 @@
 #define    FEC_RS_COMM_EXEC_STOP                                           0x0
 #define  FEC_RS_MEASUREMENT_PERIOD__A                                      0x1C30012
 #define  FEC_RS_MEASUREMENT_PRESCALE__A                                    0x1C30013
+#define FEC_RS_NR_BIT_ERRORS__A                                            0x1C30014
 #define  FEC_OC_MODE__A                                                    0x1C40011
 #define    FEC_OC_MODE_PARITY__M                                           0x1
 #define  FEC_OC_DTO_MODE__A                                                0x1C40014
@@ -129,6 +130,8 @@
 #define  OFDM_EC_SB_PRIOR__A                                               0x3410013
 #define    OFDM_EC_SB_PRIOR_HI                                             0x0
 #define    OFDM_EC_SB_PRIOR_LO                                             0x1
+#define OFDM_EC_VD_ERR_BIT_CNT__A                                          0x3420017
+#define OFDM_EC_VD_IN_BIT_CNT__A                                           0x3420018
 #define  OFDM_EQ_TOP_TD_TPS_CONST__A                                       0x3010054
 #define  OFDM_EQ_TOP_TD_TPS_CONST__M                                       0x3
 #define    OFDM_EQ_TOP_TD_TPS_CONST_64QAM                                  0x2