[PATCH 40/41] pm2fb: pixclock setting restriction

[PATCH 40/41] pm2fb: pixclock setting restriction

[Antonino A. Daplas]

From: Krzysztof Helt <krzysztof.h1@wp.pl>

This patch adds restrictions to calculations of m, n and p factors
which sets the pixclock for the Permedia 2V. I found during tests
that synchronization is unstable if m (divisor) is bigger than
half of the n (numerator). The patch disallows such settings
combination.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
---

 drivers/video/pm2fb.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/video/pm2fb.c b/drivers/video/pm2fb.c
index 6f634e3..2a8ba60 100644
--- a/drivers/video/pm2fb.c
+++ b/drivers/video/pm2fb.c
@@ -302,10 +302,10 @@ static void pm2v_mnp(u32 clk, unsigned c
 	s32 delta = 1000;
 
 	*mm = *nn = *pp = 0;
-	for (n = 1; n; n++) {
-		for ( m = 1; m; m++) {
+	for ( m = 1; m < 128; m++) {
+		for (n = 2 * m + 1; n; n++) {
 			for ( p = 0; p < 2; p++) {
-				f = PM2_REFERENCE_CLOCK * n / (m * (1 << (p + 1)));
+				f = ( PM2_REFERENCE_CLOCK >> ( p + 1 )) * n / m;
 				if ( clk > f - delta && clk < f + delta ) {
 					delta = ( clk > f ) ? clk - f : f - clk;
 					*mm=m;


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