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ARM: exynos: Fix infinite loops on CPU powerup failure

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Add timeout to infinite loops during the CPU powerup procedures. It
is better to report an error instead of busylooping for infinite time
in case of failure.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
This commit is contained in:
Marek Szyprowski 2019-03-26 15:03:59 +01:00 committed by Krzysztof Kozlowski
parent 629266bf72
commit 98a3308ea8
2 changed files with 20 additions and 2 deletions
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13
arch/arm/mach-exynos/mcpm-exynos.c
View File

@ -75,14 +75,25 @@ static int exynos_cpu_powerup(unsigned int cpu, unsigned int cluster)
*/
if (cluster &&
cluster == MPIDR_AFFINITY_LEVEL(cpu_logical_map(0), 1)) {
unsigned int timeout = 16;
/*
* Before we reset the Little cores, we should wait
* the SPARE2 register is set to 1 because the init
* codes of the iROM will set the register after
* initialization.
*/
while (!pmu_raw_readl(S5P_PMU_SPARE2))
while (timeout && !pmu_raw_readl(S5P_PMU_SPARE2)) {
timeout--;
udelay(10);
}
if (timeout == 0) {
pr_err("cpu %u cluster %u powerup failed\n",
cpu, cluster);
exynos_cpu_power_down(cpunr);
return -ETIMEDOUT;
}
pmu_raw_writel(EXYNOS5420_KFC_CORE_RESET(cpu),
EXYNOS_SWRESET);

9
arch/arm/mach-exynos/platsmp.c
View File

@ -214,13 +214,20 @@ static inline void __iomem *cpu_boot_reg(int cpu)
*/
void exynos_core_restart(u32 core_id)
{
unsigned int timeout = 16;
u32 val;
if (!of_machine_is_compatible("samsung,exynos3250"))
return;
while (!pmu_raw_readl(S5P_PMU_SPARE2))
while (timeout && !pmu_raw_readl(S5P_PMU_SPARE2)) {
timeout--;
udelay(10);
}
if (timeout == 0) {
pr_err("cpu core %u restart failed\n", core_id);
return;
}
udelay(10);
val = pmu_raw_readl(EXYNOS_ARM_CORE_STATUS(core_id));