[PATCH] iommu/arm-smmu-v3: Increase SMMU CMD queue poll timeout

Geetha sowjanya
2017-04-24T12:21:00Z

From: Geetha <gakula@cavium.com>

When large memory is being unmapped, huge no of tlb invalidation cmds are
submitted followed by a SYNC command. This sometimes hits CMD queue full and
poll on queue drain is being timedout throwing error message 'CMD_SYNC timeout'.

Although there is no functional issue, error message confuses user. Hence increased
poll timeout to 500us

Signed-off-by: Geetha <gakula@cavium.com>
---
drivers/iommu/arm-smmu-v3.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 591bb96..1dcd154 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -407,7 +407,7 @@
#define PRIQ_1_ADDR_MASK 0xfffffffffffffUL

/* High-level queue structures */
-#define ARM_SMMU_POLL_TIMEOUT_US 100
+#define ARM_SMMU_POLL_TIMEOUT_US 500

#define MSI_IOVA_BASE 0x8000000
#define MSI_IOVA_LENGTH 0x100000
--
1.9.1