target/linux/brcm47xx/patches-3.10/144-make-reboot-more-reliable.patch

   1 From 26db431400c336c4cc658cb4888bab18d254c64a Mon Sep 17 00:00:00 2001
   2 From: Hauke Mehrtens <hauke@hauke-m.de>
   3 Date: Sat, 9 Aug 2014 00:00:09 +0200
   4 Subject: [PATCH] MIPS: BCM47XX: fix reboot problem on BCM4705/BCM4785
   5
   6 This adds some code based on code from the Broadcom GPL tar to fix the
   7 reboot problems on BCM4705/BCM4785. I tried rebooting my device for ~10
   8 times and have never seen a problem. This reverts the changes in the
   9 previous commit and adds the real fix as suggested by Rafał.
  10
  11 Setting bit 22 in Reg 22, sel 4 puts the BIU (Bus Interface Unit) into
  12 async mode.
  13
  14 The previous try was this:
  15 commit 316cad5c1d4daee998cd1f83ccdb437f6f20d45c
  16 Author: Hauke Mehrtens <hauke@hauke-m.de>
  17 Date:   Mon Jul 28 23:53:57 2014 +0200
  18
  19     MIPS: BCM47XX: make reboot more relaiable
  20
  21 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  22 --- a/arch/mips/bcm47xx/setup.c
  23 +++ b/arch/mips/bcm47xx/setup.c
  24 @@ -55,7 +55,16 @@ static void bcm47xx_machine_restart(char
  25         switch (bcm47xx_bus_type) {
  26  #ifdef CONFIG_BCM47XX_SSB
  27         case BCM47XX_BUS_TYPE_SSB:
  28 +               if (bcm47xx_bus.bcma.bus.chipinfo.id == 0x4785)
  29 +                       write_c0_diag4(1 << 22);
  30                 ssb_watchdog_timer_set(&bcm47xx_bus.ssb, 1);
  31 +               if (bcm47xx_bus.bcma.bus.chipinfo.id == 0x4785) {
  32 +                       __asm__ __volatile__(
  33 +                               ".set\tmips3\n\t"
  34 +                               "sync\n\t"
  35 +                               "wait\n\t"
  36 +                               ".set\tmips0");
  37 +               }
  38                 break;
  39  #endif
  40  #ifdef CONFIG_BCM47XX_BCMA