From 76b573e46016eabc79e6764a458a559a30dfa7e9 Mon Sep 17 00:00:00 2001 From: Hauke Mehrtens Date: Sun, 22 Dec 2013 14:36:30 +0100 Subject: [PATCH] MIPS: BCM47XX: do not use cpu_wait instruction on BCM4706 The BCM4706 has a problem with the CPU wait instruction. When r4k_wait or r4k_wait_irqoff is used will just hang and not return from a msleep(). Removing the cpu_wait functionality is a workaround for this problem. The BCM4716 does not have this problem. The BCM4706 SoC uses a MIPS 74K V4.9 CPU. Signed-off-by: Hauke Mehrtens Signed-off-by: John Crispin Patchwork: http://patchwork.linux-mips.org/patch/6288/ --- arch/mips/bcm47xx/setup.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/mips/bcm47xx/setup.c b/arch/mips/bcm47xx/setup.c index 71e5c7cae814..aa2d8e39a9b0 100644 --- a/arch/mips/bcm47xx/setup.c +++ b/arch/mips/bcm47xx/setup.c @@ -32,6 +32,7 @@ #include #include #include +#include #include #include #include @@ -199,6 +200,15 @@ static void __init bcm47xx_register_bcma(void) panic("Failed to initialize BCMA bus (err %d)", err); bcm47xx_fill_bcma_boardinfo(&bcm47xx_bus.bcma.bus.boardinfo, NULL); + + /* The BCM4706 has a problem with the CPU wait instruction. + * When r4k_wait or r4k_wait_irqoff is used will just hang and + * not return from a msleep(). Removing the cpu_wait + * functionality is a workaround for this problem. The BCM4716 + * does not have this problem. + */ + if (bcm47xx_bus.bcma.bus.chipinfo.id == BCMA_CHIP_ID_BCM4706) + cpu_wait = NULL; } #endif -- 2.20.1