openwrt/target/linux/brcm47xx/patches-3.10/170-fix-74k-cpu.patch

From fb143ba7f7cd215bc2fc34a478c4c0b6dc56e537 Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Mon, 6 Jan 2014 14:51:59 +0100
Subject: [PATCH] MIPS: BCM47XX: fix position of cpu_wait disabling

The disabling of cpu_wait was done too early, before the detection was
done. This moves the code to a position where it actually works.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Acked-by: Rafa? Mi?ecki <zajec5@gmail.com>
---
 arch/mips/bcm47xx/setup.c |   34 +++++++++++++++++++++++++---------
 1 file changed, 25 insertions(+), 9 deletions(-)

--- a/arch/mips/bcm47xx/setup.c
+++ b/arch/mips/bcm47xx/setup.c
@@ -37,6 +37,7 @@
 #include <asm/prom.h>
 #include <asm/reboot.h>
 #include <asm/time.h>
+#include <asm/idle.h>
 #include <bcm47xx.h>
 #include <bcm47xx_nvram.h>
 #include <bcm47xx_board.h>
@@ -231,6 +232,31 @@ void __init plat_mem_setup(void)
 	mips_set_machine_name(bcm47xx_board_get_name());
 }
 
+static int __init bcm47xx_cpu_fixes(void)
+{
+	switch (bcm47xx_bus_type) {
+#ifdef CONFIG_BCM47XX_SSB
+	case BCM47XX_BUS_TYPE_SSB:
+		/* Nothing to do */
+		break;
+#endif
+#ifdef CONFIG_BCM47XX_BCMA
+	case BCM47XX_BUS_TYPE_BCMA:
+		/* 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;
+		break;
+#endif
+	}
+	return 0;
+}
+arch_initcall(bcm47xx_cpu_fixes);
+
 static int __init bcm47xx_register_bus_complete(void)
 {
 	switch (bcm47xx_bus_type) {