[PATCH] ARM: sunxi: Fix CPU powerdown on A83T
From: Ondrej Jirman <hidden>
Date: 2019-10-28 21:49:27
Also in:
lkml, stable
Subsystem:
arm port, arm/allwinner sunxi soc support, the rest · Maintainers:
Russell King, Chen-Yu Tsai, Jernej Skrabec, Samuel Holland, Linus Torvalds
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: 6961275e72a8c1 ("ARM: sun8i: smp: Add support for A83T")
Signed-off-by: Ondrej Jirman <redacted>
Cc: stable@vger.kernel.org
---
arch/arm/mach-sunxi/mc_smp.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-sunxi/mc_smp.c b/arch/arm/mach-sunxi/mc_smp.c
index 239084cf8192..26cbce135338 100644
--- a/arch/arm/mach-sunxi/mc_smp.c
+++ b/arch/arm/mach-sunxi/mc_smp.c@@ -481,14 +481,18 @@ static void sunxi_mc_smp_cpu_die(unsigned int l_cpu) static int sunxi_cpu_powerdown(unsigned int cpu, unsigned int cluster) { u32 reg; + int gating_bit = cpu; pr_debug("%s: cluster %u cpu %u\n", __func__, cluster, cpu); if (cpu >= SUNXI_CPUS_PER_CLUSTER || cluster >= SUNXI_NR_CLUSTERS) return -EINVAL; + if (is_a83t && cpu == 0) + gating_bit = 4; + /* gate processor power */ reg = readl(prcm_base + PRCM_PWROFF_GATING_REG(cluster)); - reg |= PRCM_PWROFF_GATING_REG_CORE(cpu); + reg |= PRCM_PWROFF_GATING_REG_CORE(gating_bit); writel(reg, prcm_base + PRCM_PWROFF_GATING_REG(cluster)); udelay(20);
--
2.23.0
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