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| author | Stefan Roese <sr@denx.de> | 2010-08-26 17:14:51 +0200 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2010-09-03 11:14:21 +0200 |
| commit | c1ab75c7d4e5d080c630335b78681c50aa3569a5 (patch) | |
| tree | 61e5c6b109fb5ed73257663dfb92aca36a34891f /arch/powerpc/cpu | |
| parent | 38570b2ff3b618892b7b7f2d4c80f5b79d49018f (diff) | |
| download | u-boot-imx-c1ab75c7d4e5d080c630335b78681c50aa3569a5.zip u-boot-imx-c1ab75c7d4e5d080c630335b78681c50aa3569a5.tar.gz u-boot-imx-c1ab75c7d4e5d080c630335b78681c50aa3569a5.tar.bz2 | |
ppc4xx: Fix 440EPx bug in reconfigure_pll()
This patch fixes a bug in reconfigure_pll(), where the detection of
the current bootstrap option is wrong. The ICS bits where incorrectly
shifted. This bug was found on the lwmon5 board, which uses bootstrap
option H (I2C bootstrap EEPROM).
Additionally a bit of code was moved into the if statement, since its
only used after later on. No need to run this code all the time.
Also, a few empty lines are added to make the code better readable.
Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Rupjyoti Sarmah <rsarmah@amcc.com>
Cc: Victor Gallardo <vgallardo@appliedmicro.com>
Diffstat (limited to 'arch/powerpc/cpu')
| -rw-r--r-- | arch/powerpc/cpu/ppc4xx/cpu_init.c | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/arch/powerpc/cpu/ppc4xx/cpu_init.c b/arch/powerpc/cpu/ppc4xx/cpu_init.c index c04eede..b31bd0b 100644 --- a/arch/powerpc/cpu/ppc4xx/cpu_init.c +++ b/arch/powerpc/cpu/ppc4xx/cpu_init.c @@ -142,22 +142,28 @@ void reconfigure_pll(u32 new_cpu_freq) * modify it. */ if (temp == 1) { - mfcpr(CPR0_PLLD, reg); - /* Get current value of fbdv. */ - temp = (reg & PLLD_FBDV_MASK) >> 24; - fbdv = temp ? temp : 32; - /* Get current value of lfbdv. */ - temp = (reg & PLLD_LFBDV_MASK); - lfbdv = temp ? temp : 64; /* * Load register that contains current boot strapping option. */ mfcpr(CPR0_ICFG, reg); - /* Shift strapping option into low 3 bits.*/ - reg = (reg >> 28); + /* + * Strapping option bits (ICS) are already in correct position, + * only masking needed. + */ + reg &= CPR0_ICFG_ICS_MASK; if ((reg == BOOT_STRAP_OPTION_A) || (reg == BOOT_STRAP_OPTION_B) || (reg == BOOT_STRAP_OPTION_D) || (reg == BOOT_STRAP_OPTION_E)) { + mfcpr(CPR0_PLLD, reg); + + /* Get current value of fbdv. */ + temp = (reg & PLLD_FBDV_MASK) >> 24; + fbdv = temp ? temp : 32; + + /* Get current value of lfbdv. */ + temp = (reg & PLLD_LFBDV_MASK); + lfbdv = temp ? temp : 64; + /* * Get current value of FWDVA. Assign current FWDVA to * new FWDVB. @@ -165,12 +171,14 @@ void reconfigure_pll(u32 new_cpu_freq) mfcpr(CPR0_PLLD, reg); target_fwdvb = (reg & PLLD_FWDVA_MASK) >> 16; fwdvb = target_fwdvb ? target_fwdvb : 8; + /* * Get current value of FWDVB. Assign current FWDVB to * new FWDVA. */ target_fwdva = (reg & PLLD_FWDVB_MASK) >> 8; fwdva = target_fwdva ? target_fwdva : 16; + /* * Update CPR0_PLLD with switched FWDVA and FWDVB. */ @@ -181,6 +189,7 @@ void reconfigure_pll(u32 new_cpu_freq) ((fbdv == 32 ? 0 : fbdv) << 24) | (lfbdv == 64 ? 0 : lfbdv); mtcpr(CPR0_PLLD, reg); + /* Acknowledge that a reset is required. */ reset_needed = 1; } |