| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 036/125] ARM: sunxi: Fix CPU powerdown on A83T | Date | Mon, 11 Nov 2019 19:27:55 +0100 |
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From: Ondrej Jirman <megous@megous.com>
commit e690053e97e7a9c968df9a97cef9089dfa8e6a44 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: 6961275e72a8c1 ("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>
--- arch/arm/mach-sunxi/mc_smp.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- a/arch/arm/mach-sunxi/mc_smp.c +++ b/arch/arm/mach-sunxi/mc_smp.c @@ -478,14 +478,18 @@ static void sunxi_mc_smp_cpu_die(unsigne 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);
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