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| author | Zhou Yanjie <zhouyanjie@zoho.com> | 2019-08-02 16:27:37 +0800 |
|---|---|---|
| committer | Paul Burton <paul.burton@mips.com> | 2019-08-05 18:30:45 -0700 |
| commit | 053951dda71ecb4b554a2cdbe26f5f6f9bee9dd2 (patch) | |
| tree | bc5f96fe93a333b97db884157b188a37c4e69c23 /arch/mips/include | |
| parent | 579de8f86b1cdc3f9ef105fca9f4539d99647ed1 (diff) | |
| download | linux-053951dda71ecb4b554a2cdbe26f5f6f9bee9dd2.tar.bz2 | |
MIPS: Ingenic: Disable broken BTB lookup optimization.
In order to further reduce power consumption, the XBurst core
by default attempts to avoid branch target buffer lookups by
detecting & special casing loops. This feature will cause
BogoMIPS and lpj calculate in error. Set cp0 config7 bit 4 to
disable this feature.
Signed-off-by: Zhou Yanjie <zhouyanjie@zoho.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: ralf@linux-mips.org
Cc: paul@crapouillou.net
Cc: jhogan@kernel.org
Cc: malat@debian.org
Cc: gregkh@linuxfoundation.org
Cc: tglx@linutronix.de
Cc: allison@lohutok.net
Cc: syq@debian.org
Cc: chenhc@lemote.com
Cc: jiaxun.yang@flygoat.com
Diffstat (limited to 'arch/mips/include')
| -rw-r--r-- | arch/mips/include/asm/mipsregs.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h index 1e6966e8527e..bdbdc19a2b8f 100644 --- a/arch/mips/include/asm/mipsregs.h +++ b/arch/mips/include/asm/mipsregs.h @@ -689,6 +689,9 @@ #define MIPS_CONF7_IAR (_ULCAST_(1) << 10) #define MIPS_CONF7_AR (_ULCAST_(1) << 16) +/* Ingenic Config7 bits */ +#define MIPS_CONF7_BTB_LOOP_EN (_ULCAST_(1) << 4) + /* Config7 Bits specific to MIPS Technologies. */ /* Performance counters implemented Per TC */ @@ -2813,6 +2816,7 @@ __BUILD_SET_C0(status) __BUILD_SET_C0(cause) __BUILD_SET_C0(config) __BUILD_SET_C0(config5) +__BUILD_SET_C0(config7) __BUILD_SET_C0(intcontrol) __BUILD_SET_C0(intctl) __BUILD_SET_C0(srsmap) |