From: Ralf Baechle Date: Fri, 14 Sep 2007 18:08:43 +0000 (+0100) Subject: [MIPS] 20Kc: Disable use of WAIT instruction. X-Git-Tag: firefly_0821_release~26510^2 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=50da469a79fa2152d824f25f5ad5962f4af4343d;p=firefly-linux-kernel-4.4.55.git [MIPS] 20Kc: Disable use of WAIT instruction. Another issue with 20Kc's WAIT, waiting for more details. With the 2.6.23 release immindent simply disable the use of WAIT instead of a more fancy workaround. Signed-off-by: Ralf Baechle --- diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c index 06448a9656dc..3e004161ebd5 100644 --- a/arch/mips/kernel/cpu-probe.c +++ b/arch/mips/kernel/cpu-probe.c @@ -199,7 +199,14 @@ static inline void check_wait(void) if ((c->processor_id & 0xff) <= 0x64) break; - cpu_wait = r4k_wait; + /* + * Another rev is incremeting c0_count at a reduced clock + * rate while in WAIT mode. So we basically have the choice + * between using the cp0 timer as clocksource or avoiding + * the WAIT instruction. Until more details are known, + * disable the use of WAIT for 20Kc entirely. + cpu_wait = r4k_wait; + */ break; case CPU_RM9000: if ((c->processor_id & 0x00ff) >= 0x40)