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linux/arch/mips
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NeilBrown a63d706ea7
MIPS: ralink: Fix booting on MT7621 
Since commit 3af5a67c86 ("MIPS: Fix early CM probing") the MT7621 has
not been able to boot.

This commit caused mips_cm_probe() to be called before
mt7621.c::proc_soc_init().

prom_soc_init() has a comment explaining that mips_cm_probe() "wipes out
the bootloader config" and means that configuration registers are no
longer available. It has some code to re-enable this config.

Before this re-enable code is run, the sysc register cannot be read, so
when SYSC_REG_CHIP_NAME0 is read, a garbage value is returned and
panic() is called.

If we move the config-repair code to the top of prom_soc_init(), the
registers can be read and boot can proceed.

Very occasionally, the first register read after the reconfiguration
returns garbage, so add a call to __sync().

Fixes: 3af5a67c86 ("MIPS: Fix early CM probing")
Signed-off-by: NeilBrown <neil@brown.name>
Reviewed-by: Matt Redfearn <matt.redfearn@mips.com>
Cc: John Crispin <john@phrozen.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: <stable@vger.kernel.org> # 4.5+
Patchwork: https://patchwork.linux-mips.org/patch/18859/
Signed-off-by: James Hogan <jhogan@kernel.org>
2018-03-22 00:06:30 +00:00
..
alchemy MIPS changes for 4.15 2017-11-15 11:36:08 -08:00
ar7 MIPS: AR7: ensure the port type's FCR value is used 2018-01-10 11:34:56 +01:00
ath25 MIPS: ath25: Check for kzalloc allocation failure 2018-02-23 09:35:54 +00:00
ath79 Merge branch 'i2c/for-4.15' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2017-11-14 17:52:21 -08:00
bcm47xx MIPS: bcm47xx: enable ZBOOT support 2018-01-24 11:20:29 +00:00
bcm63xx MIPS: BCM63XX: kconfig: Remove blank help text 2018-02-02 23:53:10 +09:00
bmips License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
boot MIPS: boot: Define __ASSEMBLY__ for its.S build 2018-02-22 17:06:25 -08:00
cavium-octeon MIPS: OCTEON: irq: Check for null return on kzalloc allocation 2018-02-23 09:44:46 +00:00
cobalt
configs MIPS changes for 4.16 2018-02-07 11:22:44 -08:00
dec License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
emma
fw License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
generic MIPS: Generic: Support GIC in EIC mode 2018-02-05 14:36:03 +00:00
include MIPS: Drop spurious __unused in struct compat_flock 2018-02-20 15:46:44 +00:00
jazz MIPS: Set I/O port resource types correctly 2017-12-18 23:07:45 -06:00
jz4740 MIPS: ingenic: Initial GCW Zero support 2018-01-18 22:08:10 +00:00
kernel MIPS: BMIPS: Do not mask IPIs during suspend 2018-03-05 23:35:04 +00:00
kvm KVM: introduce kvm_arch_vcpu_async_ioctl 2017-12-14 09:26:59 +01:00
lantiq MIPS: lantiq: ase: Enable MFD_SYSCON 2018-03-21 21:57:35 +00:00
lasat treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
lib MIPS: Implement __multi3 for GCC7 MIPS64r6 builds 2018-01-11 14:40:31 +01:00
loongson32 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
loongson64 MIPS: Loongson64: Select ARCH_MIGHT_HAVE_PC_SERIO 2018-03-05 09:59:31 +00:00
math-emu MIPS: math-emu: Mark fall throughs in switch statements with a comment 2017-12-12 17:20:20 +01:00
mm MIPS changes for 4.16 2018-02-07 11:22:44 -08:00
mti-malta MIPS: Set I/O port resource types correctly 2017-12-18 23:07:45 -06:00
net bpf, mips64: remove unneeded zero check from div/mod with k 2018-01-26 16:42:06 -08:00
netlogic mips/netlogic: remove swiotlb support 2018-01-15 09:35:59 +01:00
oprofile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
paravirt License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci MIPS changes for 4.15 2017-11-15 11:36:08 -08:00
pic32 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pistachio License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pmcs-msp71xx License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pnx833x mtd: nand: Rename nand.h into rawnand.h 2017-08-13 10:11:49 +02:00
power License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ralink MIPS: ralink: Fix booting on MT7621 2018-03-22 00:06:30 +00:00
rb532 MIPS: RB532: Avoid undefined mac_pton without GENERIC_NET_UTILS 2018-01-10 16:39:03 +01:00
sgi-ip22 Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
sgi-ip27 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sgi-ip32 mips: ip22/32: Convert timers to use timer_setup() 2017-11-02 15:50:36 -07:00
sibyte License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sni License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tools Update MIPS email addresses 2017-11-03 09:02:30 -07:00
txx9 MIPS: TXx9: use IS_BUILTIN() for CONFIG_LEDS_CLASS 2018-02-05 13:32:17 +00:00
vdso License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vr41xx License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kbuild
Kbuild.platforms MIPS: Xilfpga: Switch to using generic defconfigs 2017-11-08 22:54:14 +00:00
Kconfig Kbuild updates for v4.16 (2nd) 2018-02-09 19:32:41 -08:00
Kconfig.debug MIPS: Fix CPS SMP NS16550 UART defaults 2018-01-10 16:44:49 +01:00
Makefile MIPS: XPA: Use XPA instructions in assembly 2018-01-22 20:51:55 +00:00
Makefile.postlink License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00