Patchwork [v4,1/6] ARM: tegra: Use DT /cpu node to detect number of CPU core

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Submitter Hiroshi Doyu
Date Jan. 24, 2013, 11:10 a.m.
Message ID <1359025829-22306-2-git-send-email-hdoyu@nvidia.com>
Download mbox | patch
Permalink /patch/215321/
State Accepted, archived
Headers show

Comments

Hiroshi Doyu - Jan. 24, 2013, 11:10 a.m.
Tegra SoCs does not use SCU based to detect CPU core numbers but they
use DT /cpu node. If it's not provided or failed, it continues as a
single core.

Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
---
Based on the discussion:
http://lists.infradead.org/pipermail/linux-arm-kernel/2013-January/140608.html
---
 arch/arm/mach-tegra/platsmp.c |   15 ---------------
 1 file changed, 15 deletions(-)
Stephen Warren - Jan. 28, 2013, 6:04 p.m.
On 01/24/2013 04:10 AM, Hiroshi Doyu wrote:
> Tegra SoCs does not use SCU based to detect CPU core numbers but they
> use DT /cpu node. If it's not provided or failed, it continues as a
> single core.

I've applied patch 1 to Tegra's for-3.9/scu-base-rework branch, and
patches 2-6 to Tegra's for-3.9/soc-t114 branch.
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Patch

diff --git a/arch/arm/mach-tegra/platsmp.c b/arch/arm/mach-tegra/platsmp.c
index 3ec7fc4..ee847896 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);
 }