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authorHauke Mehrtens <hauke@hauke-m.de>2013-12-22 14:36:30 +0100
committerRalf Baechle <ralf@linux-mips.org>2014-01-24 22:39:51 +0100
commit76b573e46016eabc79e6764a458a559a30dfa7e9 (patch)
tree13e611b711eef02344a00370fe71e513087a5e56 /arch/mips/bcm47xx
parent7da4b6f8ffdbcddcb203d890617768af51d1ad91 (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.c10
1 files changed, 10 insertions, 0 deletions
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 <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