diff options
| author | Manuel Lauss <manuel.lauss@gmail.com> | 2015-02-18 11:01:56 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-06 14:52:54 -0800 |
| commit | 6a5f2ac063bce807cff8fb1e575a9fca280579a5 (patch) | |
| tree | 6c64122bf2a581364cae006673a6727b13e8aad9 /arch | |
| parent | 22d0e08a28b2ef2bf9ab1c62021bf0a8545cd02c (diff) | |
MIPS: Alchemy: Fix cpu clock calculation
commit 69e4e63ec816a7e22cc3aa14bc7ef4ac734d370c upstream.
The current code uses bits 0-6 of the sys_cpupll register to calculate
core clock speed. However this is only valid on Au1300, on all earlier
models the hardware only uses bits 0-5 to generate core clock.
This fixes clock calculation on the MTX1 (Au1500), where bit 6 of cpupll
is set as well, which ultimately lead the code to calculate a bogus cpu
core clock and also uart base clock down the line.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Reported-by: John Crispin <blogic@openwrt.org>
Tested-by: Bruno Randolf <br1@einfach.org>
Cc: Linux-MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/9279/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/alchemy/common/clock.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/mips/alchemy/common/clock.c b/arch/mips/alchemy/common/clock.c index d7557cde271a..3fff11ec7dc0 100644 --- a/arch/mips/alchemy/common/clock.c +++ b/arch/mips/alchemy/common/clock.c @@ -128,6 +128,8 @@ static unsigned long alchemy_clk_cpu_recalc(struct clk_hw *hw, t = 396000000; else { t = alchemy_rdsys(AU1000_SYS_CPUPLL) & 0x7f; + if (alchemy_get_cputype() < ALCHEMY_CPU_AU1300) + t &= 0x3f; t *= parent_rate; } |