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authorSuzuki K Poulose <suzuki.poulose@arm.com>2016-02-23 13:49:51 +0300
committerWill Deacon <will.deacon@arm.com>2016-03-01 02:23:17 +0300
commit11300027b985af524d216c0ca1cf2b834610b636 (patch)
tree1f22dc472b3432ed341aae05cff878e45915b4ff /drivers/bus
parentcea16f8ba783b7d2ef15230c52f62eb6a134b417 (diff)
downloadlinux-11300027b985af524d216c0ca1cf2b834610b636.tar.xz
arm-cci: Add helper to enable PMU without synchornising counters
On CCI-500 writing to a counter requires turning the PMU on. So, synchronising the counter state should not be performed for such special cases, while turning the PMU on. This patch adds a helper, __cci_pmu_enable_nosync(), without flushing the counter states. Cc: Punit Agrawal <punit.agrawal@arm.com> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/bus')
-rw-r--r--drivers/bus/arm-cci.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
index 7ce7da0a17c7..bcc4c59c1e39 100644
--- a/drivers/bus/arm-cci.c
+++ b/drivers/bus/arm-cci.c
@@ -640,18 +640,23 @@ void cci_pmu_sync_counters(struct cci_pmu *cci_pmu)
}
/* Should be called with cci_pmu->hw_events->pmu_lock held */
-static void __cci_pmu_enable(struct cci_pmu *cci_pmu)
+static void __cci_pmu_enable_nosync(struct cci_pmu *cci_pmu)
{
u32 val;
- cci_pmu_sync_counters(cci_pmu);
-
/* Enable all the PMU counters. */
val = readl_relaxed(cci_ctrl_base + CCI_PMCR) | CCI_PMCR_CEN;
writel(val, cci_ctrl_base + CCI_PMCR);
}
/* Should be called with cci_pmu->hw_events->pmu_lock held */
+static void __cci_pmu_enable_sync(struct cci_pmu *cci_pmu)
+{
+ cci_pmu_sync_counters(cci_pmu);
+ __cci_pmu_enable_nosync(cci_pmu);
+}
+
+/* Should be called with cci_pmu->hw_events->pmu_lock held */
static void __cci_pmu_disable(void)
{
u32 val;
@@ -960,7 +965,7 @@ static irqreturn_t pmu_handle_irq(int irq_num, void *dev)
}
/* Enable the PMU and sync possibly overflowed counters */
- __cci_pmu_enable(cci_pmu);
+ __cci_pmu_enable_sync(cci_pmu);
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
return IRQ_RETVAL(handled);
@@ -1004,7 +1009,7 @@ static void cci_pmu_enable(struct pmu *pmu)
return;
raw_spin_lock_irqsave(&hw_events->pmu_lock, flags);
- __cci_pmu_enable(cci_pmu);
+ __cci_pmu_enable_sync(cci_pmu);
raw_spin_unlock_irqrestore(&hw_events->pmu_lock, flags);
}