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ARM: sunxi: Fix CPU powerdown on A83T
commite690053e97
upstream. PRCM_PWROFF_GATING_REG has CPU0 at bit 4 on A83T. So without this patch, instead of gating the CPU0, the whole cluster was power gated, when shutting down first CPU in the cluster. Fixes:6961275e72
("ARM: sun8i: smp: Add support for A83T") Signed-off-by: Ondrej Jirman <megous@megous.com> Acked-by: Chen-Yu Tsai <wens@csie.org> Cc: stable@vger.kernel.org Signed-off-by: Maxime Ripard <mripard@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 5 additions and 1 deletions
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@ -478,14 +478,18 @@ static void sunxi_mc_smp_cpu_die(unsigned int l_cpu)
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static int sunxi_cpu_powerdown(unsigned int cpu, unsigned int cluster)
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{
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u32 reg;
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int gating_bit = cpu;
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pr_debug("%s: cluster %u cpu %u\n", __func__, cluster, cpu);
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if (cpu >= SUNXI_CPUS_PER_CLUSTER || cluster >= SUNXI_NR_CLUSTERS)
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return -EINVAL;
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if (is_a83t && cpu == 0)
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gating_bit = 4;
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/* gate processor power */
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reg = readl(prcm_base + PRCM_PWROFF_GATING_REG(cluster));
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reg |= PRCM_PWROFF_GATING_REG_CORE(cpu);
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reg |= PRCM_PWROFF_GATING_REG_CORE(gating_bit);
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writel(reg, prcm_base + PRCM_PWROFF_GATING_REG(cluster));
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udelay(20);
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