From: hdoyu@nvidia.com (Hiroshi Doyu)
To: linux-arm-kernel@lists.infradead.org
Subject: [v3 3/9] ARM: tegra: Use DT /cpu node to detect number of CPU core
Date: Tue, 15 Jan 2013 08:14:00 -0000 [thread overview]
Message-ID: <1358237598-32413-4-git-send-email-hdoyu@nvidia.com> (raw)
In-Reply-To: <1358237598-32413-1-git-send-email-hdoyu@nvidia.com>
SCU based detection only works with Cortex-A9 MP and it doesn't
support ones with multiple clusters. The only way to detect number of
CPU core correctly is with DT /cpu node.
Tegra SoCs decided to use DT detection as the only way and to not use
SCU based detection at all. Even if DT /cpu node based detection
fails, it continues with a single core
Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
---
Based on the discussion:
http://lists.infradead.org/pipermail/linux-arm-kernel/2013-January/140608.html
Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
---
arch/arm/mach-tegra/platsmp.c | 15 ---------------
1 file changed, 15 deletions(-)
diff --git a/arch/arm/mach-tegra/platsmp.c b/arch/arm/mach-tegra/platsmp.c
index 6867030..689ee4b 100644
--- a/arch/arm/mach-tegra/platsmp.c
+++ b/arch/arm/mach-tegra/platsmp.c
@@ -177,23 +177,8 @@ done:
return status;
}
-/*
- * Initialise the CPU possible map early - this describes the CPUs
- * which may be present or become present in the system.
- */
static void __init tegra_smp_init_cpus(void)
{
- unsigned int i, ncores = scu_get_core_count(scu_base);
-
- if (ncores > nr_cpu_ids) {
- pr_warn("SMP: %u cores greater than maximum (%u), clipping\n",
- ncores, nr_cpu_ids);
- ncores = nr_cpu_ids;
- }
-
- for (i = 0; i < ncores; i++)
- set_cpu_possible(i, true);
-
set_smp_cross_call(gic_raise_softirq);
}
--
1.7.9.5
next prev parent reply other threads:[~2013-01-15 8:14 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-15 8:13 [v3 0/9] ARM: Initial support for Tegra 114 SoC Hiroshi Doyu
2013-01-15 8:13 ` [v3 1/9] ARM: tegra: fuse: Add chipid TEGRA114 0x35 Hiroshi Doyu
2013-01-31 16:39 ` Hiroshi Doyu
2013-01-15 8:14 ` [v3 2/9] HACK: ARM: tegra: Use CLK_IGNORE_UNUSED for Tegra 114 SoC Hiroshi Doyu
2013-01-15 8:14 ` Hiroshi Doyu [this message]
2013-01-21 12:35 ` [v3 3/9] ARM: tegra: Use DT /cpu node to detect number of CPU core Lorenzo Pieralisi
2013-01-15 8:14 ` [v3 4/9] ARM: Add API to detect SCU base address from CP15 Hiroshi Doyu
2013-01-15 8:14 ` [v3 5/9] ARM: tegra: Skip scu_enable(scu_base) if not Cortex A9 Hiroshi Doyu
2013-01-15 8:14 ` [v3 6/9] ARM: dt: tegra114: Add new SoC base, Tegra 114 SoC Hiroshi Doyu
2013-01-15 16:55 ` Stephen Warren
2013-01-15 17:27 ` Peter De Schrijver
2013-01-16 5:06 ` Hiroshi Doyu
2013-01-15 8:14 ` [v3 7/9] ARM: dt: tegra114: Add new board, Dalmore Hiroshi Doyu
2013-01-15 8:14 ` [v3 8/9] ARM: dt: tegra114: Add new board, Pluto Hiroshi Doyu
2013-01-15 8:14 ` [v3 9/9] ARM: tegra: Add initial support for Tegra 114 SoC Hiroshi Doyu
2013-01-18 10:54 ` [RESEND][v3 4/9] ARM: Add API to detect SCU base address from CP15 Hiroshi Doyu
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