(The initial patch cause too long tune delay on non-present carriers. Use the
hardware derot, by writing zero to the derot register.)
>From 2b960abaeeaa32f6bcaa350ca80906c467ab9cb1 Mon Sep 17 00:00:00 2001
From: Hans Petter Selasky <hsela...@c2i.net>
Date: Tue, 24 May 2011 21:44:53 +0200
Subject: [PATCH] Fix the derot zig-zag to work with TT-USB2.0 TechnoTrend
hardware.
Signed-off-by: Hans Petter Selasky <hsela...@c2i.net>
---
drivers/media/dvb/frontends/stb0899_algo.c | 130
++++++++--------------------
drivers/media/dvb/frontends/stb0899_priv.h | 2 -
2 files changed, 36 insertions(+), 96 deletions(-)
diff --git a/drivers/media/dvb/frontends/stb0899_algo.c
b/drivers/media/dvb/frontends/stb0899_algo.c
index d70eee0..0cdaac2 100644
--- a/drivers/media/dvb/frontends/stb0899_algo.c
+++ b/drivers/media/dvb/frontends/stb0899_algo.c
@@ -117,7 +117,7 @@ static u32 stb0899_set_srate(struct stb0899_state *state,
u32 master_clk, u32 sr
*/
static long stb0899_calc_derot_time(long srate)
{
- if (srate > 0)
+ if (srate > 999)
return (100000 / (srate / 1000));
else
return 0;
@@ -207,36 +207,23 @@ static enum stb0899_status stb0899_search_tmg(struct
stb0899_state *state)
{
struct stb0899_internal *internal = &state->internal;
struct stb0899_params *params = &state->params;
-
- short int derot_step, derot_freq = 0, derot_limit, next_loop = 3;
- int index = 0;
- u8 cfr[2];
+ int index;
+ u8 cfr[2] = {0,0};
internal->status = NOTIMING;
- /* timing loop computation & symbol rate optimisation */
- derot_limit = (internal->sub_range / 2L) / internal->mclk;
- derot_step = (params->srate / 2L) / internal->mclk;
-
- while ((stb0899_check_tmg(state) != TIMINGOK) && next_loop) {
- index++;
- derot_freq += index * internal->direction * derot_step; /* next
derot zig zag position */
+ /* let the hardware figure out derot frequency */
+ stb0899_write_regs(state, STB0899_CFRM, cfr, 2); /* derotator frequency
*/
- if (abs(derot_freq) > derot_limit)
- next_loop--;
-
- if (next_loop) {
- STB0899_SETFIELD_VAL(CFRM, cfr[0],
MSB(state->config->inversion *
derot_freq));
- STB0899_SETFIELD_VAL(CFRL, cfr[1],
LSB(state->config->inversion *
derot_freq));
- stb0899_write_regs(state, STB0899_CFRM, cfr, 2); /*
derotator
frequency */
+ for (index = 0; index < 8; index++) {
+ if (stb0899_check_tmg(state) == TIMINGOK) {
+ /* get derotator frequency */
+ stb0899_read_regs(state, STB0899_CFRM, cfr, 2);
+ internal->derot_freq = state->config->inversion *
MAKEWORD16(cfr[0], cfr[1]);
+ dprintk(state->verbose, FE_DEBUG, 1, "------->TIMING OK
! "
+ "Derot Freq = %d", internal->derot_freq);
+ break;
}
- internal->direction = -internal->direction; /* Change
zigzag direction
*/
- }
-
- if (internal->status == TIMINGOK) {
- stb0899_read_regs(state, STB0899_CFRM, cfr, 2); /* get
derotator
frequency */
- internal->derot_freq = state->config->inversion *
MAKEWORD16(cfr[0],
cfr[1]);
- dprintk(state->verbose, FE_DEBUG, 1, "------->TIMING OK ! Derot
Freq =
%d", internal->derot_freq);
}
return internal->status;
@@ -277,50 +264,25 @@ static enum stb0899_status stb0899_check_carrier(struct
stb0899_state *state)
static enum stb0899_status stb0899_search_carrier(struct stb0899_state
*state)
{
struct stb0899_internal *internal = &state->internal;
-
- short int derot_freq = 0, last_derot_freq = 0, derot_limit, next_loop =
3;
- int index = 0;
+ int index;
u8 cfr[2];
u8 reg;
internal->status = NOCARRIER;
- derot_limit = (internal->sub_range / 2L) / internal->mclk;
- derot_freq = internal->derot_freq;
reg = stb0899_read_reg(state, STB0899_CFD);
STB0899_SETFIELD_VAL(CFD_ON, reg, 1);
stb0899_write_reg(state, STB0899_CFD, reg);
- do {
- dprintk(state->verbose, FE_DEBUG, 1, "Derot Freq=%d, mclk=%d",
derot_freq, internal->mclk);
- if (stb0899_check_carrier(state) == NOCARRIER) {
- index++;
- last_derot_freq = derot_freq;
- derot_freq += index * internal->direction *
internal->derot_step;
/* next zig zag derotator position */
-
- if(abs(derot_freq) > derot_limit)
- next_loop--;
-
- if (next_loop) {
- reg = stb0899_read_reg(state, STB0899_CFD);
- STB0899_SETFIELD_VAL(CFD_ON, reg, 1);
- stb0899_write_reg(state, STB0899_CFD, reg);
-
- STB0899_SETFIELD_VAL(CFRM, cfr[0],
MSB(state->config-
>inversion * derot_freq));
- STB0899_SETFIELD_VAL(CFRL, cfr[1],
LSB(state->config-
>inversion * derot_freq));
- stb0899_write_regs(state, STB0899_CFRM, cfr,
2); /* derotator
frequency */
- }
+ for (index = 0; index < 8; index++) {
+ if (stb0899_check_carrier(state) == CARRIEROK) {
+ /* get derotator frequency */
+ stb0899_read_regs(state, STB0899_CFRM, cfr, 2);
+ internal->derot_freq = state->config->inversion *
MAKEWORD16(cfr[0], cfr[1]);
+ dprintk(state->verbose, FE_DEBUG, 1, "----> CARRIER OK
!, "
+ "Derot Freq=%d", internal->derot_freq);
+ break;
}
-
- internal->direction = -internal->direction; /* Change zigzag
direction
*/
- } while ((internal->status != CARRIEROK) && next_loop);
-
- if (internal->status == CARRIEROK) {
- stb0899_read_regs(state, STB0899_CFRM, cfr, 2); /* get
derotator
frequency */
- internal->derot_freq = state->config->inversion *
MAKEWORD16(cfr[0],
cfr[1]);
- dprintk(state->verbose, FE_DEBUG, 1, "----> CARRIER OK !, Derot
Freq=%d", internal->derot_freq);
- } else {
- internal->derot_freq = last_derot_freq;
}
return internal->status;
@@ -384,46 +346,29 @@ static enum stb0899_status stb0899_check_data(struct
stb0899_state *state)
*/
static enum stb0899_status stb0899_search_data(struct stb0899_state *state)
{
- short int derot_freq, derot_step, derot_limit, next_loop = 3;
u8 cfr[2];
u8 reg;
- int index = 1;
+ int index;
struct stb0899_internal *internal = &state->internal;
struct stb0899_params *params = &state->params;
- derot_step = (params->srate / 4L) / internal->mclk;
- derot_limit = (internal->sub_range / 2L) / internal->mclk;
- derot_freq = internal->derot_freq;
-
- do {
- if ((internal->status != CARRIEROK) ||
(stb0899_check_data(state) !=
DATAOK)) {
-
- derot_freq += index * internal->direction * derot_step;
/* next
zig zag derotator position */
- if (abs(derot_freq) > derot_limit)
- next_loop--;
+ for (index = 0; index < 8; index++) {
- if (next_loop) {
- dprintk(state->verbose, FE_DEBUG, 1, "Derot
freq=%d, mclk=%d",
derot_freq, internal->mclk);
- reg = stb0899_read_reg(state, STB0899_CFD);
- STB0899_SETFIELD_VAL(CFD_ON, reg, 1);
- stb0899_write_reg(state, STB0899_CFD, reg);
-
- STB0899_SETFIELD_VAL(CFRM, cfr[0],
MSB(state->config-
>inversion * derot_freq));
- STB0899_SETFIELD_VAL(CFRL, cfr[1],
LSB(state->config-
>inversion * derot_freq));
- stb0899_write_regs(state, STB0899_CFRM, cfr,
2); /* derotator
frequency */
-
- stb0899_check_carrier(state);
- index++;
- }
+ if ((internal->status == CARRIEROK) &&
+ (stb0899_check_data(state) == DATAOK)) {
+ /* get derotator frequency */
+ stb0899_read_regs(state, STB0899_CFRM, cfr, 2);
+ internal->derot_freq = state->config->inversion *
MAKEWORD16(cfr[0], cfr[1]);
+ dprintk(state->verbose, FE_DEBUG, 1, "------> DATAOK !
Derot
Freq=%d", internal->derot_freq);
+ break;
}
- internal->direction = -internal->direction; /* change zig zag
direction */
- } while ((internal->status != DATAOK) && next_loop);
- if (internal->status == DATAOK) {
- stb0899_read_regs(state, STB0899_CFRM, cfr, 2); /* get
derotator
frequency */
- internal->derot_freq = state->config->inversion *
MAKEWORD16(cfr[0],
cfr[1]);
- dprintk(state->verbose, FE_DEBUG, 1, "------> DATAOK ! Derot
Freq=%d",
internal->derot_freq);
+ reg = stb0899_read_reg(state, STB0899_CFD);
+ STB0899_SETFIELD_VAL(CFD_ON, reg, 1);
+ stb0899_write_reg(state, STB0899_CFD, reg);
+
+ stb0899_check_carrier(state);
}
return internal->status;
@@ -508,8 +453,6 @@ enum stb0899_status stb0899_dvbs_algo(struct stb0899_state
*state)
{ 37, 36, 33, 32 } /* QPSK 7/8 */
};
- internal->direction = 1;
-
stb0899_set_srate(state, internal->master_clk, params->srate);
/* Carrier loop optimization versus symbol rate for acquisition*/
if (params->srate <= 5000000) {
@@ -553,7 +496,6 @@ enum stb0899_status stb0899_dvbs_algo(struct stb0899_state
*state)
internal->derot_percent, params->srate, internal->mclk);
/* Initial calculations */
- internal->derot_step = internal->derot_percent * (params->srate /
1000L) /
internal->mclk; /* DerotStep/1000 * Fsymbol */
internal->t_derot = stb0899_calc_derot_time(params->srate);
internal->t_data = 500;
diff --git a/drivers/media/dvb/frontends/stb0899_priv.h
b/drivers/media/dvb/frontends/stb0899_priv.h
index 82395b9..d26ced5 100644
--- a/drivers/media/dvb/frontends/stb0899_priv.h
+++ b/drivers/media/dvb/frontends/stb0899_priv.h
@@ -176,8 +176,6 @@ struct stb0899_internal {
s16 derot_freq; /* Current derotator
frequency (Hz) */
s16 derot_percent;
- s16 direction; /* Current derotator
search direction */
- s16 derot_step; /* Derotator step
(binary value) */
s16 t_derot; /* Derotator time
constant (ms) */
s16 t_data; /* Data recovery time
constant (ms) */
s16 sub_dir; /* Direction of the
next sub range */
--
1.7.1.1
--
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