3.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Manuel Lauss <manuel.lauss@xxxxxxxxx> 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@xxxxxxxxx> Reported-by: John Crispin <blogic@xxxxxxxxxxx> Tested-by: Bruno Randolf <br1@xxxxxxxxxxx> Cc: Linux-MIPS <linux-mips@xxxxxxxxxxxxxx> Patchwork: https://patchwork.linux-mips.org/patch/9279/ Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/mips/alchemy/common/clock.c | 2 ++ 1 file changed, 2 insertions(+) --- a/arch/mips/alchemy/common/clock.c +++ b/arch/mips/alchemy/common/clock.c @@ -127,6 +127,8 @@ static unsigned long alchemy_clk_cpu_rec t = 396000000; else { t = alchemy_rdsys(AU1000_SYS_CPUPLL) & 0x7f; + if (alchemy_get_cputype() < ALCHEMY_CPU_AU1300) + t &= 0x3f; t *= parent_rate; }
