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authorOndrej Jirman <megous@megous.com>2019-10-29 00:49:14 +0300
committerMaxime Ripard <mripard@kernel.org>2019-10-29 11:09:56 +0300
commite690053e97e7a9c968df9a97cef9089dfa8e6a44 (patch)
tree086ceb8d99d5c88a8100ded0332b068909a76504 /arch
parente614f341253f8541baf0230a8dc6a016b544b1e2 (diff)
downloadlinux-e690053e97e7a9c968df9a97cef9089dfa8e6a44.tar.xz
ARM: sunxi: Fix CPU powerdown on A83T
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mach-sunxi/mc_smp.c6
1 files changed, 5 insertions, 1 deletions
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);