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Subject: [PATCH] Intel FB pixel clock calculation fix 

Intel framebuffer mis-calculated pixel clocks.

The pixel clock (and thus both H and V sync) will be slower than requested, so
if you set the minimum allowed the display may not sync.  In case of really
old CRT display it could theoretically damage it.

I'm using it with PAL TV (using RGB input - SCART connector) and the bug
prevented it from working at all (TV requirements are more strict and made the
bug visible).

Signed-off-by: Krzysztof Halasa <khc@pm.waw.pl>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Krzysztof Halasa 2007-09-11 15:24:12 -07:00 committed by Linus Torvalds
parent ba0268a8b0
commit 9c54ea9585
1 changed files with 3 additions and 3 deletions
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6
drivers/video/intelfb/intelfbhw.c
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@ -924,10 +924,10 @@ calc_pll_params(int index, int clock, u32 *retm1, u32 *retm2, u32 *retn, u32 *re
if (m > pll->max_m) if (m > pll->max_m)
m = pll->max_m - 1; m = pll->max_m - 1;
for (testm = m - 1; testm <= m; testm++) { for (testm = m - 1; testm <= m; testm++) {
f_out = calc_vclock3(index, m, n, p); f_out = calc_vclock3(index, testm, n, p);
if (splitm(index, testm, &m1, &m2)) { if (splitm(index, testm, &m1, &m2)) {
WRN_MSG("cannot split m = %d\n", m); WRN_MSG("cannot split m = %d\n",
n++; testm);
continue; continue;
} }
if (clock > f_out) if (clock > f_out)