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authorPaul Walmsley <paul@pwsan.com>2009-01-28 20:08:44 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-02-08 18:50:35 +0100
commit95f538ac370d9625457ba00ef7c3bb91e2b92f89 (patch)
tree3fff982958af2674f57a200ff26619e32135f95c /arch/arm/plat-omap/include
parent[ARM] OMAP3 clock: optimize DPLL rate rounding algorithm (diff)
downloadlinux-95f538ac370d9625457ba00ef7c3bb91e2b92f89.tar.xz
linux-95f538ac370d9625457ba00ef7c3bb91e2b92f89.zip
[ARM] OMAP3 clock: avoid invalid FREQSEL values during DPLL rate rounding
The DPLL FREQSEL jitter correction bits are set based on a table in the 34xx TRM, Table 4-38, according to the DPLL's internal clock frequency "Fint." Several Fint frequency ranges are missing from this table. Previously, we allowed these Fint frequency ranges to be selected in the rate rounding code, but did not change the FREQSEL bits. Correspondence with the OMAP hardware team indicates that Fint values not in the table should not be used. So, prevent them from being selected during DPLL rate rounding. This removes warnings and also can prevent the chip from locking up. The first pass through the rate rounding code will update the DPLL max and min dividers appropriately, so later rate rounding passes will run faster than the first. Peter de Schrijver <peter.de-schrijver@nokia.com> put up with several test cycles of this patch - thanks Peter. linux-omap source commit is f9c1b82f55b60fc39eaa6e7aa1fbe380c0ffe2e9. Signed-off-by: Paul Walmsley <paul@pwsan.com> Cc: Peter de Schrijver <peter.de-schrijver@nokia.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/plat-omap/include')
-rw-r--r--arch/arm/plat-omap/include/mach/clock.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/include/mach/clock.h b/arch/arm/plat-omap/include/mach/clock.h
index 611df52a3242..cd69111cd33f 100644
--- a/arch/arm/plat-omap/include/mach/clock.h
+++ b/arch/arm/plat-omap/include/mach/clock.h
@@ -43,6 +43,7 @@ struct dpll_data {
unsigned long last_rounded_rate;
u16 last_rounded_m;
u8 last_rounded_n;
+ u8 min_divider;
u8 max_divider;
u32 max_tolerance;
u16 max_multiplier;