From patchwork Sun Oct 10 15:08:27 2010
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Subject: [v2] V4L/DVB: faster DVB-S lock for mantis cards using stb0899 demod
Date: Sun, 10 Oct 2010 15:08:27 -0000
From: Tuxoholic <tuxoholic@hotmail.de>
X-Patchwork-Id: 244201
Message-Id: <BLU0-SMTP58AB09E7C9178301416281D8520@phx.gbl>
To: linux-media@vger.kernel.org
Cc: manu@linuxtv.org
hi list
This is a modified version of my previous patch [1] to improve the tuning algo
of stb0899 cards using the mantis bridge.
With the kind help of Bjørn Mork I was able to keep it minimally invasive with
the same effect.
Over the last month many testers in vdr-portal.de [2] reported positive
results using the patch.
This should run fine with all sort of cards using the stb0899 demodulator.
[1] http://www.spinics.net/lists/linux-media/msg23181.html
[2] http://www.vdr-portal.de/board/thread.php?threadid=99603
Signed-off-by: SE <tuxoholic@hotmail.de>
@@ -206,7 +206,6 @@ static enum stb0899_status stb0899_check_tmg(struct stb0899_state *state)
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;
@@ -216,10 +215,9 @@ static enum stb0899_status stb0899_search_tmg(struct stb0899_state *state)
/* timing loop computation & symbol rate optimisation */
derot_limit = (internal->sub_range / 2L) / internal->mclk;
- derot_step = (params->srate / 2L) / internal->mclk;
+ derot_step = internal->derot_step * 4; /* dertot_step = decreasing delta */
while ((stb0899_check_tmg(state) != TIMINGOK) && next_loop) {
- index++;
derot_freq += index * internal->direction * derot_step; /* next derot zig zag position */
if (abs(derot_freq) > derot_limit)
@@ -230,6 +228,7 @@ static enum stb0899_status stb0899_search_tmg(struct stb0899_state *state)
STB0899_SETFIELD_VAL(CFRL, cfr[1], LSB(state->config->inversion * derot_freq));
stb0899_write_regs(state, STB0899_CFRM, cfr, 2); /* derotator frequency */
}
+ index++;
internal->direction = -internal->direction; /* Change zigzag direction */
}
@@ -278,14 +277,18 @@ 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;
+ short int derot_freq = 0, last_derot_freq = 0, derot_limit, derot_step, next_loop = 3;
int index = 0;
+ int base_freq;
u8 cfr[2];
u8 reg;
internal->status = NOCARRIER;
derot_limit = (internal->sub_range / 2L) / internal->mclk;
derot_freq = internal->derot_freq;
+ derot_step = internal->derot_step * 2;
+ last_derot_freq = internal->derot_freq;
+ base_freq = internal->derot_freq;
reg = stb0899_read_reg(state, STB0899_CFD);
STB0899_SETFIELD_VAL(CFD_ON, reg, 1);
@@ -294,11 +297,10 @@ static enum stb0899_status stb0899_search_carrier(struct stb0899_state *state)
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 */
+ derot_freq += index * internal->direction * derot_step; /* next zig zag derotator position */
- if(abs(derot_freq) > derot_limit)
+ if (derot_freq > base_freq + derot_limit || derot_freq < base_freq - derot_limit)
next_loop--;
if (next_loop) {
@@ -310,9 +312,10 @@ static enum stb0899_status stb0899_search_carrier(struct stb0899_state *state)
STB0899_SETFIELD_VAL(CFRL, cfr[1], LSB(state->config->inversion * derot_freq));
stb0899_write_regs(state, STB0899_CFRM, cfr, 2); /* derotator frequency */
}
+ index++;
+ internal->direction = -internal->direction; /* Change zigzag direction */
}
- internal->direction = -internal->direction; /* Change zigzag direction */
} while ((internal->status != CARRIEROK) && next_loop);
if (internal->status == CARRIEROK) {
@@ -338,6 +341,7 @@ static enum stb0899_status stb0899_check_data(struct stb0899_state *state)
int lock = 0, index = 0, dataTime = 500, loop;
u8 reg;
+ msleep(1);
internal->status = NODATA;
/* RESET FEC */
@@ -348,6 +352,7 @@ static enum stb0899_status stb0899_check_data(struct stb0899_state *state)
reg = stb0899_read_reg(state, STB0899_TSTRES);
STB0899_SETFIELD_VAL(FRESACS, reg, 0);
stb0899_write_reg(state, STB0899_TSTRES, reg);
+ msleep(1);
if (params->srate <= 2000000)
dataTime = 2000;
@@ -360,6 +365,7 @@ static enum stb0899_status stb0899_check_data(struct stb0899_state *state)
stb0899_write_reg(state, STB0899_DSTATUS2, 0x00); /* force search loop */
while (1) {
+ msleep(1); // Alex: added 1 mSec
/* WARNING! VIT LOCKED has to be tested before VIT_END_LOOOP */
reg = stb0899_read_reg(state, STB0899_VSTATUS);
lock = STB0899_GETFIELD(VSTATUS_LOCKEDVIT, reg);
@@ -387,20 +393,21 @@ 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 = 0;
+ int base_freq;
struct stb0899_internal *internal = &state->internal;
- struct stb0899_params *params = &state->params;
- derot_step = (params->srate / 4L) / internal->mclk;
+ derot_step = internal->derot_step;
derot_limit = (internal->sub_range / 2L) / internal->mclk;
derot_freq = internal->derot_freq;
+ base_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)
+ if (derot_freq > base_freq + derot_limit || derot_freq < base_freq - derot_limit)
next_loop--;
if (next_loop) {
@@ -414,9 +421,9 @@ static enum stb0899_status stb0899_search_data(struct stb0899_state *state)
stb0899_write_regs(state, STB0899_CFRM, cfr, 2); /* derotator frequency */
stb0899_check_carrier(state);
- index++;
}
}
+ index++;
internal->direction = -internal->direction; /* change zig zag direction */
} while ((internal->status != DATAOK) && next_loop);
--
1.7.1