V4L/DVB (5247): Stv0297: Enable BER/UNC counting

Enable BER/UNC counting for the stv0297 frontend.
The idea for this patch comes from stv0297_cs.c.

Signed-off-by: Hartmut Birr <e9hack@googlemail.com>
Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 15 insertions, 4 deletions

diff --git a/drivers/media/dvb/frontends/stv0297.c b/drivers/media/dvb/frontends/stv0297.c
index 1ca64249010c..9a343972ff50 100644
--- a/drivers/media/dvb/frontends/stv0297.c
+++ b/drivers/media/dvb/frontends/stv0297.c
@@ -35,6 +35,7 @@ struct stv0297_state {
         const struct stv0297_config *config;
         struct dvb_frontend frontend;
 
+        unsigned long last_ber;
         unsigned long base_freq;
 };
 
@@ -310,6 +311,8 @@ static int stv0297_init(struct dvb_frontend *fe)
                 stv0297_writereg(state, state->config->inittab[i], state->config->inittab[i+1]);
         msleep(200);
 
+        state->last_ber = 0;
+
         return 0;
 }
 
@@ -340,11 +343,13 @@ static int stv0297_read_ber(struct dvb_frontend *fe, u32 * ber)
         struct stv0297_state *state = fe->demodulator_priv;
         u8 BER[3];
 
-        stv0297_writereg(state, 0xA0, 0x80);    // Start Counting bit errors for 4096 Bytes
-        mdelay(25);             // Hopefully got 4096 Bytes
         stv0297_readregs(state, 0xA0, BER, 3);
-        mdelay(25);
-        *ber = (BER[2] << 8 | BER[1]) / (8 * 4096);
+        if (!(BER[0] & 0x80)) {
+                state->last_ber = BER[2] << 8 | BER[1];
+                stv0297_writereg_mask(state, 0xA0, 0x80, 0x80);
+        }
+
+        *ber = state->last_ber;
 
         return 0;
 }
@@ -376,9 +381,14 @@ static int stv0297_read_ucblocks(struct dvb_frontend *fe, u32 * ucblocks)
 {
         struct stv0297_state *state = fe->demodulator_priv;
 
+        stv0297_writereg_mask(state, 0xDF, 0x03, 0x03); /* freeze the counters */
+
         *ucblocks = (stv0297_readreg(state, 0xD5) << 8)
                 | stv0297_readreg(state, 0xD4);
 
+        stv0297_writereg_mask(state, 0xDF, 0x03, 0x02); /* clear the counters */
+        stv0297_writereg_mask(state, 0xDF, 0x03, 0x01); /* re-enable the counters */
+
         return 0;
 }
 
@@ -648,6 +658,7 @@ struct dvb_frontend *stv0297_attach(const struct stv0297_config *config,
         /* setup the state */
         state->config = config;
         state->i2c = i2c;
+        state->last_ber = 0;
         state->base_freq = 0;
 
         /* check if the demod is there */