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authorMauro Carvalho Chehab <m.chehab@samsung.com>2014-07-04 17:15:37 (GMT)
committerMauro Carvalho Chehab <m.chehab@samsung.com>2014-07-07 12:58:59 (GMT)
commitd6c62b7638d22c978174973b487ef81ac9082d08 (patch)
treea098a0325619790cc81b65867ab8b6a69871d0e9
parent0de04ca1dc0bd38fd7b88871ab9a17e2d8dbd0db (diff)
[media] dib8000: use jifies instead of current_kernel_time()
Instead of doing the tuning delays and timeouts using current_kernel_time(), use jiffies. That consumes less CPU cycles, and it is monotonic. Acked-By: Patrick Boettcher <pboettcher@kernellabs.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
-rw-r--r--drivers/media/dvb-frontends/dib8000.c57
1 files changed, 30 insertions, 27 deletions
diff --git a/drivers/media/dvb-frontends/dib8000.c b/drivers/media/dvb-frontends/dib8000.c
index 91bdecc..6419ae6 100644
--- a/drivers/media/dvb-frontends/dib8000.c
+++ b/drivers/media/dvb-frontends/dib8000.c
@@ -115,7 +115,7 @@ struct dib8000_state {
u16 found_guard;
u8 subchannel;
u8 symbol_duration;
- u32 timeout;
+ unsigned long timeout;
u8 longest_intlv_layer;
u16 output_mode;
@@ -1237,7 +1237,7 @@ static int dib8000_agc_soft_split(struct dib8000_state *state)
u16 agc, split_offset;
if (!state->current_agc || !state->current_agc->perform_agc_softsplit || state->current_agc->split.max == 0)
- return FE_CALLBACK_TIME_NEVER;
+ return 0;
// n_agc_global
agc = dib8000_read_word(state, 390);
@@ -2849,12 +2849,12 @@ static void dib8000_set_sync_wait(struct dib8000_state *state)
dib8000_write_word(state, 273, (dib8000_read_word(state, 273) & 0x000f) | (sync_wait << 4));
}
-static u32 dib8000_get_timeout(struct dib8000_state *state, u32 delay, enum timeout_mode mode)
+static unsigned long dib8000_get_timeout(struct dib8000_state *state, u32 delay, enum timeout_mode mode)
{
if (mode == SYMBOL_DEPENDENT_ON)
- return systime() + (delay * state->symbol_duration);
- else
- return systime() + delay;
+ delay *= state->symbol_duration;
+
+ return jiffies + usecs_to_jiffies(delay * 100);
}
static s32 dib8000_get_status(struct dvb_frontend *fe)
@@ -3006,8 +3006,8 @@ static int dib8000_tune(struct dvb_frontend *fe)
u16 locks, deeper_interleaver = 0, i;
int ret = 1; /* 1 symbol duration (in 100us unit) delay most of the time */
- u32 *timeout = &state->timeout;
- u32 now = systime();
+ unsigned long *timeout = &state->timeout;
+ unsigned long now = jiffies;
#ifdef DIB8000_AGC_FREEZE
u16 agc1, agc2;
#endif
@@ -3017,7 +3017,8 @@ static int dib8000_tune(struct dvb_frontend *fe)
#if 0
if (*tune_state < CT_DEMOD_STOP)
- dprintk("IN: context status = %d, TUNE_STATE %d autosearch step = %u systime = %u", state->channel_parameters_set, *tune_state, state->autosearch_state, now);
+ dprintk("IN: context status = %d, TUNE_STATE %d autosearch step = %u jiffies = %lu",
+ state->channel_parameters_set, *tune_state, state->autosearch_state, now);
#endif
switch (*tune_state) {
@@ -3186,7 +3187,7 @@ static int dib8000_tune(struct dvb_frontend *fe)
} else {
*tune_state = CT_DEMOD_STEP_8;
}
- } else if (now > *timeout) {
+ } else if (time_after(now, *timeout)) {
*tune_state = CT_DEMOD_STEP_6; /* goto check for diversity input connection */
}
break;
@@ -3215,7 +3216,7 @@ static int dib8000_tune(struct dvb_frontend *fe)
if (locks & (1<<10)) { /* lmod4_lock */
ret = 14; /* wait for 14 symbols */
*tune_state = CT_DEMOD_STEP_8;
- } else if (now > *timeout)
+ } else if (time_after(now, *timeout))
*tune_state = CT_DEMOD_STEP_6; /* goto check for diversity input connection */
break;
@@ -3258,8 +3259,9 @@ static int dib8000_tune(struct dvb_frontend *fe)
if (state->diversity_onoff != 0) /* because of diversity sync */
locks *= 2;
- *timeout = now + (2000 * locks); /* give the mpeg lock 800ms if sram is present */
- dprintk("Deeper interleaver mode = %d on layer %d : timeout mult factor = %d => will use timeout = %d", deeper_interleaver, state->longest_intlv_layer, locks, *timeout);
+ *timeout = now + msecs_to_jiffies(200 * locks); /* give the mpeg lock 800ms if sram is present */
+ dprintk("Deeper interleaver mode = %d on layer %d : timeout mult factor = %d => will use timeout = %ld",
+ deeper_interleaver, state->longest_intlv_layer, locks, *timeout);
*tune_state = CT_DEMOD_STEP_10;
} else
@@ -3278,7 +3280,7 @@ static int dib8000_tune(struct dvb_frontend *fe)
else
state->status = FE_STATUS_DATA_LOCKED;
*tune_state = CT_DEMOD_STOP;
- } else if (now > *timeout) {
+ } else if (time_after(now, *timeout)) {
if (c->isdbt_sb_mode
&& c->isdbt_sb_subchannel < 14
&& !state->differential_constellation) { /* continue to try init prbs autosearch */
@@ -3324,7 +3326,7 @@ static int dib8000_tune(struct dvb_frontend *fe)
state->agc2_min = 0;
}
#endif
- ret = FE_CALLBACK_TIME_NEVER;
+ ret = 0;
break;
default:
break;
@@ -3547,9 +3549,9 @@ static int dib8000_set_frontend(struct dvb_frontend *fe)
{
struct dib8000_state *state = fe->demodulator_priv;
struct dtv_frontend_properties *c = &state->fe[0]->dtv_property_cache;
- int l, i, active, time, time_slave = FE_CALLBACK_TIME_NEVER;
+ int l, i, active, time, time_slave = 0;
u8 exit_condition, index_frontend;
- u32 delay, callback_time;
+ unsigned long delay, callback_time;
if (c->frequency == 0) {
dprintk("dib8000: must at least specify frequency ");
@@ -3601,12 +3603,12 @@ static int dib8000_set_frontend(struct dvb_frontend *fe)
time = dib8000_agc_startup(state->fe[0]);
for (index_frontend = 1; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++) {
time_slave = dib8000_agc_startup(state->fe[index_frontend]);
- if (time == FE_CALLBACK_TIME_NEVER)
+ if (time == 0)
time = time_slave;
- else if ((time_slave != FE_CALLBACK_TIME_NEVER) && (time_slave > time))
+ else if ((time_slave != 0) && (time_slave > time))
time = time_slave;
}
- if (time == FE_CALLBACK_TIME_NEVER)
+ if (time == 0)
break;
/*
@@ -3633,11 +3635,14 @@ static int dib8000_set_frontend(struct dvb_frontend *fe)
active = 1;
do {
- callback_time = FE_CALLBACK_TIME_NEVER;
+ callback_time = 0;
for (index_frontend = 0; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++) {
delay = dib8000_tune(state->fe[index_frontend]);
- if (delay != FE_CALLBACK_TIME_NEVER)
- delay += systime();
+ if (delay != 0) {
+ delay = jiffies + usecs_to_jiffies(100 * delay);
+ if (!callback_time || delay < callback_time)
+ callback_time = delay;
+ }
/* we are in autosearch */
if (state->channel_parameters_set == 0) { /* searching */
@@ -3666,8 +3671,6 @@ static int dib8000_set_frontend(struct dvb_frontend *fe)
}
}
}
- if (delay < callback_time)
- callback_time = delay;
}
/* tuning is done when the master frontend is done (failed or success) */
if (dib8000_get_status(state->fe[0]) == FE_STATUS_TUNE_FAILED ||
@@ -3683,12 +3686,12 @@ static int dib8000_set_frontend(struct dvb_frontend *fe)
dprintk("tuning done with status %d", dib8000_get_status(state->fe[0]));
}
- if ((active == 1) && (callback_time == FE_CALLBACK_TIME_NEVER)) {
+ if ((active == 1) && (callback_time == 0)) {
dprintk("strange callback time something went wrong");
active = 0;
}
- while ((active == 1) && (systime() < callback_time))
+ while ((active == 1) && (time_before(jiffies, callback_time)))
msleep(100);
} while (active);

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