diff options
| author | Hauke Mehrtens <hauke@hauke-m.de> | 2013-12-22 14:36:30 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2014-01-24 22:39:51 +0100 |
| commit | 76b573e46016eabc79e6764a458a559a30dfa7e9 (patch) | |
| tree | 13e611b711eef02344a00370fe71e513087a5e56 /arch/mips/bcm47xx | |
| parent | 7da4b6f8ffdbcddcb203d890617768af51d1ad91 (diff) | |
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 <hauke@hauke-m.de>
Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/6288/
Diffstat (limited to 'arch/mips/bcm47xx')
| -rw-r--r-- | arch/mips/bcm47xx/setup.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/mips/bcm47xx/setup.c b/arch/mips/bcm47xx/setup.c index 71e5c7cae81..aa2d8e39a9b 100644 --- a/arch/mips/bcm47xx/setup.c +++ b/arch/mips/bcm47xx/setup.c @@ -32,6 +32,7 @@ #include <linux/ssb/ssb_embedded.h> #include <linux/bcma/bcma_soc.h> #include <asm/bootinfo.h> +#include <asm/idle.h> #include <asm/prom.h> #include <asm/reboot.h> #include <asm/time.h> @@ -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 |