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authorBenoît Thébaudeau <benoit.thebaudeau@advansee.com>2012-09-27 10:26:54 +0000
committerTom Rini <trini@ti.com>2012-10-15 11:54:12 -0700
commit3c76add2628116872befc230cdd4df8e3a6ac5e3 (patch)
tree93204c63ca403a4f0133fb7adeea039a69ea46f5 /arch/arm
parent323846561a7253433818d0e04630cb83433fa0f1 (diff)
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mx25: Fix decode_pll
The MFN bit-field of the PLL registers represents a signed value. See the reference manual. Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com> Cc: Stefano Babic <sbabic@denx.de>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/cpu/arm926ejs/mx25/generic.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/arm/cpu/arm926ejs/mx25/generic.c b/arch/arm/cpu/arm926ejs/mx25/generic.c
index 4f1aad0..d34e84c 100644
--- a/arch/arm/cpu/arm926ejs/mx25/generic.c
+++ b/arch/arm/cpu/arm926ejs/mx25/generic.c
@@ -48,7 +48,7 @@ static unsigned int imx_decode_pll(unsigned int pll, unsigned int f_ref)
{
unsigned int mfi = (pll >> CCM_PLL_MFI_SHIFT)
& CCM_PLL_MFI_MASK;
- unsigned int mfn = (pll >> CCM_PLL_MFN_SHIFT)
+ int mfn = (pll >> CCM_PLL_MFN_SHIFT)
& CCM_PLL_MFN_MASK;
unsigned int mfd = (pll >> CCM_PLL_MFD_SHIFT)
& CCM_PLL_MFD_MASK;
@@ -56,9 +56,12 @@ static unsigned int imx_decode_pll(unsigned int pll, unsigned int f_ref)
& CCM_PLL_PD_MASK;
mfi = mfi <= 5 ? 5 : mfi;
+ mfn = mfn >= 512 ? mfn - 1024 : mfn;
+ mfd += 1;
+ pd += 1;
- return lldiv(2 * (u64) f_ref * (mfi * (mfd + 1) + mfn),
- (mfd + 1) * (pd + 1));
+ return lldiv(2 * (u64) f_ref * (mfi * mfd + mfn),
+ mfd * pd);
}
static ulong imx_get_mpllclk(void)