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authorManu Abraham <abraham.manu@gmail.com>2007-10-15 12:08:20 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2008-12-29 17:53:18 -0200
commit6efb0ffe09bec45397142da8e1197885f562e7fa (patch)
tree542c19af62a50acc38a8a7ed8f1521f8b9f360a5 /drivers/media/dvb/ttpci/budget-ci.c
parent417dd69de843a2f67a9ff6e21df7de5be5dd8204 (diff)
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>
Diffstat (limited to 'drivers/media/dvb/ttpci/budget-ci.c')
-rw-r--r--drivers/media/dvb/ttpci/budget-ci.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/media/dvb/ttpci/budget-ci.c b/drivers/media/dvb/ttpci/budget-ci.c
index 6b77b123f75..21f5e2c6b4c 100644
--- a/drivers/media/dvb/ttpci/budget-ci.c
+++ b/drivers/media/dvb/ttpci/budget-ci.c
@@ -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)) {