Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c6e62a3a398d62e8ae366ac1465911db0ac7fc0b
Commit: c6e62a3a398d62e8ae366ac1465911db0ac7fc0b
Parent: 5ccaf905015c83a9b28e8496b4504b9b8dc25a80
Author: Chris Pascoe <[EMAIL PROTECTED]>
AuthorDate: Tue Nov 20 02:49:41 2007 -0300
Committer: Mauro Carvalho Chehab <[EMAIL PROTECTED]>
CommitDate: Fri Jan 25 19:02:36 2008 -0200
V4L/DVB (6654): mt352: support oversampled IF input
Rework the input frequency calculation so that it produces the right values
when the ADC oversamples the IF input.
This means MT352 devices can now process a near-zero IF (according to the,
specs 4.57MHz is supported with the default crystal).
Signed-off-by: Chris Pascoe <[EMAIL PROTECTED]>
Signed-off-by: Mauro Carvalho Chehab <[EMAIL PROTECTED]>
---
drivers/media/dvb/frontends/mt352.c | 8 +++++++-
1 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/drivers/media/dvb/frontends/mt352.c
b/drivers/media/dvb/frontends/mt352.c
index 5dd9b73..7cd190b 100644
--- a/drivers/media/dvb/frontends/mt352.c
+++ b/drivers/media/dvb/frontends/mt352.c
@@ -152,7 +152,13 @@ static void mt352_calc_input_freq(struct mt352_state*
state,
if (state->config.if2)
if2 = state->config.if2;
- ife = (2*adc_clock - if2);
+ if (adc_clock >= if2 * 2)
+ ife = if2;
+ else {
+ ife = adc_clock - (if2 % adc_clock);
+ if (ife > adc_clock / 2)
+ ife = adc_clock - ife;
+ }
value = -16374 * ife / adc_clock;
dprintk("%s: if2 %d, ife %d, adc_clock %d => %d / 0x%x\n",
__FUNCTION__, if2, ife, adc_clock, value, value & 0x3fff);
-
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