[4.2.y-ckt stable] Patch "MIPS: BMIPS: Fix PRID_IMP_BMIPS5000 masking for BMIPS5200" has been added to the 4.2.y-ckt tree

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    MIPS: BMIPS: Fix PRID_IMP_BMIPS5000 masking for BMIPS5200

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    https://git.launchpad.net/~canonical-kernel/linux/+git/linux-stable-ckt/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt12.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From 00fe904300c193277f960551ba946c6df2e0f8ac Mon Sep 17 00:00:00 2001
From: Florian Fainelli <f.fainelli at gmail.com>
Date: Fri, 29 Jan 2016 21:17:26 -0800
Subject: MIPS: BMIPS: Fix PRID_IMP_BMIPS5000 masking for BMIPS5200

commit cbbda6e7c9c3e4532bd70a73ff9d5e6655c894dc upstream.

BMIPS5000 have a PrID value of 0x5A00 and BMIPS5200 have a PrID value of
0x5B00, which, masked with 0x5A00, returns 0x5A00. Update all conditionals on
the PrID to cover both variants since we are going to need this to enable
BMIPS5200 SMP. The existing check, masking with 0xFF00 would not cover
BMIPS5200 at all.

Fixes: 68e6a78373a6d ("MIPS: BMIPS: Add PRId for BMIPS5200 (Whirlwind)")
Fixes: 6465460c92a85 ("MIPS: BMIPS: change compile time checks to runtime checks")
Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
Cc: john at phrozen.org
Cc: cernekee at gmail.com
Cc: jogo at openwrt.org
Cc: jaedon.shin at gmail.com
Cc: jfraser at broadcom.com
Cc: pgynther at google.com
Cc: dragan.stancevic at gmail.com
Cc: linux-mips at linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12279/
Signed-off-by: Ralf Baechle <ralf at linux-mips.org>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 arch/mips/kernel/bmips_vec.S | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/mips/kernel/bmips_vec.S b/arch/mips/kernel/bmips_vec.S
index 8649507..d9495f3 100644
--- a/arch/mips/kernel/bmips_vec.S
+++ b/arch/mips/kernel/bmips_vec.S
@@ -93,7 +93,8 @@ NESTED(bmips_reset_nmi_vec, PT_SIZE, sp)
 #if defined(CONFIG_CPU_BMIPS5000)
 	mfc0	k0, CP0_PRID
 	li	k1, PRID_IMP_BMIPS5000
-	andi	k0, 0xff00
+	/* mask with PRID_IMP_BMIPS5000 to cover both variants */
+	andi	k0, PRID_IMP_BMIPS5000
 	bne	k0, k1, 1f

 	/* if we're not on core 0, this must be the SMP boot signal */
@@ -166,10 +167,12 @@ bmips_smp_entry:
 2:
 #endif /* CONFIG_CPU_BMIPS4350 || CONFIG_CPU_BMIPS4380 */
 #if defined(CONFIG_CPU_BMIPS5000)
-	/* set exception vector base */
+	/* mask with PRID_IMP_BMIPS5000 to cover both variants */
 	li	k1, PRID_IMP_BMIPS5000
+	andi	k0, PRID_IMP_BMIPS5000
 	bne	k0, k1, 3f

+	/* set exception vector base */
 	la	k0, ebase
 	lw	k0, 0(k0)
 	mtc0	k0, $15, 1
@@ -263,6 +266,8 @@ LEAF(bmips_enable_xks01)
 #endif /* CONFIG_CPU_BMIPS4380 */
 #if defined(CONFIG_CPU_BMIPS5000)
 	li	t1, PRID_IMP_BMIPS5000
+	/* mask with PRID_IMP_BMIPS5000 to cover both variants */
+	andi	t2, PRID_IMP_BMIPS5000
 	bne	t2, t1, 2f

 	mfc0	t0, $22, 5
--
2.7.4