Final patch. Please test and review!
>From 83224b9c4b5402332589139549b387066bff8277 Mon Sep 17 00:00:00 2001
From: Hans Petter Selasky
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
---
drivers/media/dvb/frontends/stb0899_algo.c | 113 ---
1 files changed, 50 insertions(+), 63 deletions(-)
diff --git a/drivers/media/dvb/frontends/stb0899_algo.c
b/drivers/media/dvb/frontends/stb0899_algo.c
index d70eee0..1dbd9be 100644
--- a/drivers/media/dvb/frontends/stb0899_algo.c
+++ b/drivers/media/dvb/frontends/stb0899_algo.c
@@ -23,6 +23,13 @@
#include "stb0899_priv.h"
#include "stb0899_reg.h"
+#include
+#include
+
+static int derot_max = 8192;
+module_param(derot_max, int, 0644);
+MODULE_PARM_DESC(derot_max, "Set Maximum Derot Value (0..32767)");
+
static inline u32 stb0899_do_div(u64 n, u32 d)
{
/* wrap do_div() for ease of use */
@@ -117,7 +124,7 @@ 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 (10 / (srate / 1000));
else
return 0;
@@ -207,30 +214,22 @@ 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 derot_freq = 0;
int index = 0;
u8 cfr[2];
internal->status = NOTIMING;
+ internal->direction = 1;
- /* 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) && (abs(derot_freq) <=
derot_max)) {
+ derot_freq += index * (index - 1) * internal->direction;
/* next
derot zig zag position */
- while ((stb0899_check_tmg(state) != TIMINGOK) && next_loop) {
- index++;
- derot_freq += index * internal->direction * derot_step; /* next
derot zig zag position */
+ 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 */
- 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 */
- }
internal->direction = -internal->direction; /* Change
zigzag direction
*/
+ index++;
}
if (internal->status == TIMINGOK) {
@@ -277,50 +276,41 @@ 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 derot_freq;
int index = 0;
u8 cfr[2];
u8 reg;
internal->status = NOCARRIER;
- derot_limit = (internal->sub_range / 2L) / internal->mclk;
+ internal->direction = 1;
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 {
+ while ((stb0899_check_carrier(state) == NOCARRIER) && (abs(derot_freq)
<=
derot_max)) {
+
+ derot_freq += index * (index - 1) * internal->direction;
/* next
derot zig zag position */
+
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);
-
