diff options
| author | Paul Burton <paul.burton@mips.com> | 2017-10-31 15:09:22 -0700 |
|---|---|---|
| committer | James Hogan <jhogan@kernel.org> | 2017-10-31 23:54:20 +0000 |
| commit | 6a6cba1d945a7511cdfaf338526871195e420762 (patch) | |
| tree | 505790d6355129f8e7aa1a2014313dacf5c0544c /arch | |
| parent | 7f005f112f527f0762386c6fd182966d0e066eaf (diff) | |
| download | lwn-6a6cba1d945a7511cdfaf338526871195e420762.tar.gz lwn-6a6cba1d945a7511cdfaf338526871195e420762.zip | |
MIPS: Fix CM region target definitions
The default CM target field in the GCR_BASE register is encoded with 0
meaning memory & 1 being reserved. However the definitions we use for
those bits effectively get these two values backwards - likely because
they were copied from the definitions for the CM regions where the
target is encoded differently. This results in use setting up GCR_BASE
with the reserved target value by default, rather than targeting memory
as intended. Although we currently seem to get away with this it's not a
great idea to rely upon.
Fix this by changing our macros to match the documentated target values.
The incorrect encoding became used as of commit 9f98f3dd0c51 ("MIPS: Add
generic CM probe & access code") in the Linux v3.15 cycle, and was
likely carried forwards from older but unused code introduced by
commit 39b8d5254246 ("[MIPS] Add support for MIPS CMP platform.") in the
v2.6.26 cycle.
Fixes: 9f98f3dd0c51 ("MIPS: Add generic CM probe & access code")
Signed-off-by: Paul Burton <paul.burton@mips.com>
Reported-by: Matt Redfearn <matt.redfearn@mips.com>
Reviewed-by: James Hogan <jhogan@kernel.org>
Cc: Matt Redfearn <matt.redfearn@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: <stable@vger.kernel.org> # v3.15+
Patchwork: https://patchwork.linux-mips.org/patch/17562/
Signed-off-by: James Hogan <jhogan@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/include/asm/mips-cm.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/mips/include/asm/mips-cm.h b/arch/mips/include/asm/mips-cm.h index 3708b8ccc0b4..8bc5df49b0e1 100644 --- a/arch/mips/include/asm/mips-cm.h +++ b/arch/mips/include/asm/mips-cm.h @@ -142,8 +142,8 @@ GCR_ACCESSOR_RO(64, 0x000, config) GCR_ACCESSOR_RW(64, 0x008, base) #define CM_GCR_BASE_GCRBASE GENMASK_ULL(47, 15) #define CM_GCR_BASE_CMDEFTGT GENMASK(1, 0) -#define CM_GCR_BASE_CMDEFTGT_DISABLED 0 -#define CM_GCR_BASE_CMDEFTGT_MEM 1 +#define CM_GCR_BASE_CMDEFTGT_MEM 0 +#define CM_GCR_BASE_CMDEFTGT_RESERVED 1 #define CM_GCR_BASE_CMDEFTGT_IOCU0 2 #define CM_GCR_BASE_CMDEFTGT_IOCU1 3 |