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V4L/DVB (9421): We must wait for the PLL to stabilize 

Thanks to Peter for the in depth explanation

Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Manu Abraham 2007-10-15 12:08:20 -03:00 committed by Mauro Carvalho Chehab
parent 417dd69de8
commit 6efb0ffe09
1 changed files with 23 additions and 0 deletions
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23
drivers/media/dvb/ttpci/budget-ci.c
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@ -1768,6 +1768,29 @@ static void frontend_init(struct budget_ci *budget_ci)
break;
case 0x1019: // TT S2-3200 PCI
/*
* NOTE! on some STB0899 versions, the internal PLL takes a longer time
* to settle, aka LOCK. On the older revisions of the chip, we don't see
* this, as a result on the newer chips the entire clock tree, will not
* be stable after a freshly POWER 'ed up situation.
* In this case, we should RESET the STB0899 (Active LOW) and wait for
* PLL stabilization.
*
* On the TT S2 3200 and clones, the STB0899 demodulator's RESETB is
* connected to the SAA7146 GPIO, GPIO2, Pin 142
*/
/* Reset Demodulator */
saa7146_setgpio(budget->dev, 2, SAA7146_GPIO_OUTLO);
/* Wait for everything to die */
msleep(50);
/* Pull it up out of Reset state */
saa7146_setgpio(budget->dev, 2, SAA7146_GPIO_OUTHI);
/* Wait for PLL to stabilize */
msleep(250);
/*
* PLL state should be stable now. Ideally, we should check
* for PLL LOCK status. But well, never mind!
*/
budget_ci->budget.dvb_frontend = dvb_attach(stb0899_attach, &tt3200_config, &budget_ci->budget.i2c_adap);
if (budget_ci->budget.dvb_frontend) {
if (dvb_attach(stb6100_attach, budget_ci->budget.dvb_frontend, &tt3200_stb6100_config, &budget_ci->budget.i2c_adap)) {