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[media] it913x-fe changes to power up and down of tuner 

Currently the tuner is constantly powered causing these effects.
1. Remembering last tune channel causing corruptions of changing channel.
2. Causing corruption on other frontend.
3. Higher current in standby of demodulator with clock running.

Power sequence now follows;
Power Up
Tuner on -> Frontend suspend off -> Tuner clk on
Power Down
Frontend suspend on -> Tuner clk off -> Tuner off

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Malcolm Priestley 2011-10-01 09:24:16 -03:00 committed by Mauro Carvalho Chehab
parent 64933337e3
commit e305288547
2 changed files with 30 additions and 7 deletions
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10
drivers/media/dvb/frontends/it913x-fe-priv.h
View File

@ -312,7 +312,15 @@ static struct it913xset it9137_set[] = {
{PRO_LINK, GPIOH5_EN, {0x01}, 0x01},
{PRO_LINK, GPIOH5_ON, {0x01}, 0x01},
{PRO_LINK, GPIOH5_O, {0x00}, 0x01},
{PRO_LINK, GPIOH5_O, {0x01}, 0x01},/* ?, but enable */
{PRO_LINK, GPIOH5_O, {0x01}, 0x01},
{0xff, 0x0000, {0x00}, 0x00}, /* Terminating Entry */
};
static struct it913xset it9137_tuner_off[] = {
{PRO_DMOD, 0xfba8, {0x01}, 0x01}, /* Tuner Clock Off */
{PRO_DMOD, 0xec40, {0x00}, 0x01}, /* Power Down Tuner */
{PRO_DMOD, 0xec02, {0x3f, 0x1f, 0x3f, 0x3f}, 0x04},
{PRO_DMOD, 0xec3f, {0x01}, 0x01},
{0xff, 0x0000, {0x00}, 0x00}, /* Terminating Entry */
};

27
drivers/media/dvb/frontends/it913x-fe.c
View File

@ -626,7 +626,7 @@ static int it913x_fe_suspend(struct it913x_fe_state *state)
for (i = 0; i < 128; i++) {
ret = it913x_read_reg(state, SUSPEND_FLAG, &b, 1);
if (ret < 0)
return -EINVAL;
return -ENODEV;
if (b == 0)
break;
@ -634,18 +634,23 @@ static int it913x_fe_suspend(struct it913x_fe_state *state)
ret |= it913x_write_reg(state, PRO_DMOD, AFE_MEM0, 0x8);
/* Turn LED off */
ret = it913x_write_reg(state, PRO_LINK, GPIOH3_O, 0x0);
ret |= it913x_write_reg(state, PRO_LINK, GPIOH3_O, 0x0);
return 0;
ret |= it913x_fe_script_loader(state, it9137_tuner_off);
return (ret < 0) ? -ENODEV : 0;
}
/* Power sequence */
/* Power Up Tuner on -> Frontend suspend off -> Tuner clk on */
/* Power Down Frontend suspend on -> Tuner clk off -> Tuner off */
static int it913x_fe_sleep(struct dvb_frontend *fe)
{
struct it913x_fe_state *state = fe->demodulator_priv;
return it913x_fe_suspend(state);
}
static u32 compute_div(u32 a, u32 b, u32 x)
{
u32 res = 0;
@ -738,11 +743,21 @@ static int it913x_fe_init(struct dvb_frontend *fe)
{
struct it913x_fe_state *state = fe->demodulator_priv;
int ret = 0;
/* Power Up Tuner - common all versions */
ret = it913x_write_reg(state, PRO_DMOD, 0xec40, 0x1);
it913x_write_reg(state, PRO_DMOD, AFE_MEM0, 0x0);
ret |= it913x_write_reg(state, PRO_DMOD, AFE_MEM0, 0x0);
ret |= it913x_fe_script_loader(state, init_1);
switch (state->tuner_type) {
case IT9137:
ret |= it913x_write_reg(state, PRO_DMOD, 0xfba8, 0x0);
break;
default:
return -EINVAL;
}
return (ret < 0) ? -ENODEV : 0;
}
@ -820,5 +835,5 @@ static struct dvb_frontend_ops it913x_fe_ofdm_ops = {
MODULE_DESCRIPTION("it913x Frontend and it9137 tuner");
MODULE_AUTHOR("Malcolm Priestley tvboxspy@gmail.com");
MODULE_VERSION("1.06");
MODULE_VERSION("1.07");
MODULE_LICENSE("GPL");