Commit ea9dd8f6 authored by Marek Szyprowski's avatar Marek Szyprowski Committed by Krzysztof Kozlowski

ARM: exynos: MCPM: Restore big.LITTLE cpuidle support

Call exynos_cpu_power_up(cpunr) unconditionally. This is needed by the
big.LITTLE cpuidle driver and has no side-effects on other code paths.

The additional soft-reset call during little core power up has been added
to properly boot all cores on the Exynos5422-based boards with secure
firmware (like Odroid XU3/XU4 family). This however broke big.LITTLE
CPUidle driver, which worked only on boards without secure firmware (like
Peach-Pit/Pi Chromebooks). Apply the workaround only when board is
running under secure firmware.

Fixes: 833b5794 ("ARM: EXYNOS: reset Little cores when cpu is up")
Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: default avatarLukasz Luba <lukasz.luba@arm.com>
Signed-off-by: default avatarKrzysztof Kozlowski <krzk@kernel.org>
parent 5b17a04a
......@@ -26,6 +26,7 @@
#define EXYNOS5420_USE_L2_COMMON_UP_STATE BIT(30)
static void __iomem *ns_sram_base_addr __ro_after_init;
static bool secure_firmware __ro_after_init;
/*
* The common v7_exit_coherency_flush API could not be used because of the
......@@ -58,15 +59,16 @@ static void __iomem *ns_sram_base_addr __ro_after_init;
static int exynos_cpu_powerup(unsigned int cpu, unsigned int cluster)
{
unsigned int cpunr = cpu + (cluster * EXYNOS5420_CPUS_PER_CLUSTER);
bool state;
pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);
if (cpu >= EXYNOS5420_CPUS_PER_CLUSTER ||
cluster >= EXYNOS5420_NR_CLUSTERS)
return -EINVAL;
if (!exynos_cpu_power_state(cpunr)) {
state = exynos_cpu_power_state(cpunr);
exynos_cpu_power_up(cpunr);
if (!state && secure_firmware) {
/*
* This assumes the cluster number of the big cores(Cortex A15)
* is 0 and the Little cores(Cortex A7) is 1.
......@@ -258,6 +260,8 @@ static int __init exynos_mcpm_init(void)
return -ENOMEM;
}
secure_firmware = exynos_secure_firmware_available();
/*
* To increase the stability of KFC reset we need to program
* the PMU SPARE3 register
......
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