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| author | Manuel Lauss <manuel.lauss@googlemail.com> | 2011-05-08 10:42:12 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2011-05-19 09:55:44 +0100 |
| commit | 0591128066bdfe07e0ef0ab7f877f794d8ba071d (patch) | |
| tree | 03c251faeb5e696659a79e88f976d4832667910e | |
| parent | 8b659a393171aed3dafa1d7455ac9eec1f3ed315 (diff) | |
| download | kernel_samsung_smdk4412-0591128066bdfe07e0ef0ab7f877f794d8ba071d.tar.gz kernel_samsung_smdk4412-0591128066bdfe07e0ef0ab7f877f794d8ba071d.tar.bz2 kernel_samsung_smdk4412-0591128066bdfe07e0ef0ab7f877f794d8ba071d.zip | |
MIPS: DB1200: Set Config[OD] for improved stability.
Setting Config[OD] gets rid of a _LOT_ of spurious CPLD interrupts,
but also decreases overall performance a bit.
Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
To: Linux-MIPS <linux-mips@linux-mips.org>
Cc: Florian Fainelli <florian@openwrt.org>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Patchwork: https://patchwork.linux-mips.org/patch/2347/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| -rw-r--r-- | arch/mips/alchemy/common/setup.c | 4 | ||||
| -rw-r--r-- | arch/mips/alchemy/devboards/db1200/setup.c | 7 |
2 files changed, 9 insertions, 2 deletions
diff --git a/arch/mips/alchemy/common/setup.c b/arch/mips/alchemy/common/setup.c index 561e5da2658..1b887c86841 100644 --- a/arch/mips/alchemy/common/setup.c +++ b/arch/mips/alchemy/common/setup.c @@ -52,8 +52,6 @@ void __init plat_mem_setup(void) /* this is faster than wasting cycles trying to approximate it */ preset_lpj = (est_freq >> 1) / HZ; - board_setup(); /* board specific setup */ - if (au1xxx_cpu_needs_config_od()) /* Various early Au1xx0 errata corrected by this */ set_c0_config(1 << 19); /* Set Config[OD] */ @@ -61,6 +59,8 @@ void __init plat_mem_setup(void) /* Clear to obtain best system bus performance */ clear_c0_config(1 << 19); /* Clear Config[OD] */ + board_setup(); /* board specific setup */ + /* IO/MEM resources. */ set_io_port_base(0); ioport_resource.start = IOPORT_RESOURCE_START; diff --git a/arch/mips/alchemy/devboards/db1200/setup.c b/arch/mips/alchemy/devboards/db1200/setup.c index 4a8980027ec..1dac4f27d33 100644 --- a/arch/mips/alchemy/devboards/db1200/setup.c +++ b/arch/mips/alchemy/devboards/db1200/setup.c @@ -23,6 +23,13 @@ void __init board_setup(void) unsigned long freq0, clksrc, div, pfc; unsigned short whoami; + /* Set Config[OD] (disable overlapping bus transaction): + * This gets rid of a _lot_ of spurious interrupts (especially + * wrt. IDE); but incurs ~10% performance hit in some + * cpu-bound applications. + */ + set_c0_config(1 << 19); + bcsr_init(DB1200_BCSR_PHYS_ADDR, DB1200_BCSR_PHYS_ADDR + DB1200_BCSR_HEXLED_OFS); |