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authorMauro Carvalho Chehab <mchehab@infradead.org>2006-08-06 17:03:50 -0300
committerMauro Carvalho Chehab <mchehab@infradead.org>2006-09-26 11:53:51 -0300
commitd93f8860cc55504b376b38b95d22efeb3cc10edd (patch)
tree0e159ad8062ae6c5cc5fe4d8a8310f52324c4fe1 /drivers/media
parent8a36ecf0f4c0861330cc9e69885b0502fedac14a (diff)
V4L/DVB (4477): Improve hardware algorithm by setting the appropriate registers
Hardware algorithm needs to be configured to: 1) Increase timeout constants, to detect weaker signals; 2) do a wider zigzag search. Acked-by: Manu Abraham <manu@linuxtv.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/dvb/frontends/cx24123.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/media/dvb/frontends/cx24123.c b/drivers/media/dvb/frontends/cx24123.c
index 6fd44a125b1..f77b2d59955 100644
--- a/drivers/media/dvb/frontends/cx24123.c
+++ b/drivers/media/dvb/frontends/cx24123.c
@@ -191,7 +191,7 @@ static struct {
{0x06, 0x31}, /* MPEG (default) */
{0x0b, 0x00}, /* Freq search start point (default) */
{0x0c, 0x00}, /* Demodulator sample gain (default) */
- {0x0d, 0x02}, /* Frequency search range = Fsymbol / 4 (default) */
+ {0x0d, 0x7f}, /* Force driver to shift until the maximum (+-10 MHz) */
{0x0e, 0x03}, /* Default non-inverted, FEC 3/4 (default) */
{0x0f, 0xfe}, /* FEC search mask (all supported codes) */
{0x10, 0x01}, /* Default search inversion, no repeat (default) */
@@ -222,6 +222,7 @@ static struct {
{0x46, 0x0d}, /* Symbol rate estimator on (default) */
{0x56, 0xc1}, /* Error Counter = Viterbi BER */
{0x57, 0xff}, /* Error Counter Window (default) */
+ {0x5c, 0x20}, /* Acquisition AFC Expiration window (default is 0x10) */
{0x67, 0x83}, /* Non-DCII symbol clock */
};
@@ -779,13 +780,15 @@ static int cx24123_read_status(struct dvb_frontend* fe, fe_status_t* status)
if (lock & 0x01)
*status |= FE_HAS_SIGNAL;
if (sync & 0x02)
- *status |= FE_HAS_CARRIER;
+ *status |= FE_HAS_CARRIER; /* Phase locked */
if (sync & 0x04)
*status |= FE_HAS_VITERBI;
+
+ /* Reed-Solomon Status */
if (sync & 0x08)
*status |= FE_HAS_SYNC;
if (sync & 0x80)
- *status |= FE_HAS_LOCK;
+ *status |= FE_HAS_LOCK; /*Full Sync */
return 0;
}
@@ -812,6 +815,7 @@ static int cx24123_read_ber(struct dvb_frontend* fe, u32* ber)
static int cx24123_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
{
struct cx24123_state *state = fe->demodulator_priv;
+
*signal_strength = cx24123_readreg(state, 0x3b) << 8; /* larger = better */
dprintk("%s: Signal strength = %d\n",__FUNCTION__,*signal_strength);