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V4L/DVB (4477): Improve hardware algorithm by setting the appropriate registers

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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>
This commit is contained in:
Mauro Carvalho Chehab 2006-08-06 17:03:50 -03:00
parent 8a36ecf0f4
commit d93f8860cc
1 changed files with 7 additions and 3 deletions
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10
drivers/media/dvb/frontends/cx24123.c
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@ -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);