The patch titled
pm2fb: pixclock setting restriction
has been added to the -mm tree. Its filename is
pm2fb-pixclock-setting-restriction.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: pm2fb: pixclock setting restriction
From: Krzysztof Helt <krzysztof.h1@xxxxx>
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@xxxxx>
Signed-off-by: Antonino Daplas <adaplas@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/video/pm2fb.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff -puN drivers/video/pm2fb.c~pm2fb-pixclock-setting-restriction drivers/video/pm2fb.c
--- a/drivers/video/pm2fb.c~pm2fb-pixclock-setting-restriction
+++ a/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;
_
Patches currently in -mm which might be from krzysztof.h1@xxxxx are
skeletonfb-various-corrections.patch
pm2fb-3dlabs-permedia-2v-reference-board-added.patch
pm2fb-permedia-2v-memory-clock-setting.patch
pm2fb-pixclock-setting-restriction.patch
-
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