[patch 11/19] Video: cx24123: fix PLL divisor setup

[Greg KH]

-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Yeasah Pell <yeasah@xxxxxxxxxxx>

The cx24109 datasheet says: "NOTE: if A=0, then N=N+1"

The current code is the result of a misinterpretation of the datasheet to
mean exactly the opposite of the requirement -- The actual value of N is 1 greater than the value written when A is 0, so 1 needs to be *subtracted*
from it to compensate.

Signed-off-by: Yeasah Pell <yeasah@xxxxxxxxxxx>
Signed-off-by: Steven Toth <stoth@xxxxxxxxxxxxx>
Signed-off-by: Michael Krufky <mkrufky@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/media/dvb/frontends/cx24123.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- linux-2.6.17.13.orig/drivers/media/dvb/frontends/cx24123.c
+++ linux-2.6.17.13/drivers/media/dvb/frontends/cx24123.c
@@ -579,8 +579,8 @@ static int cx24123_pll_calculate(struct 
 	ndiv = ( ((p->frequency * vco_div * 10) / (2 * XTAL / 1000)) / 32) & 0x1ff;
 	adiv = ( ((p->frequency * vco_div * 10) / (2 * XTAL / 1000)) % 32) & 0x1f;
 
-	if (adiv == 0)
-		ndiv++;
+	if (adiv == 0 && ndiv > 0)
+		ndiv--;
 
 	/* control bits 11, refdiv 11, charge pump polarity 1, charge pump current, ndiv, adiv */
 	state->pllarg = (3 << 19) | (3 << 17) | (1 << 16) | (pump << 14) | (ndiv << 5) | adiv;

--
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