From: Magnus Damm <damm+renesas@xxxxxxxxxxxxx>
Introduce a feature to allow opt-out of setting up
IMBUSCR. The default case is unchanged.
Signed-off-by: Magnus Damm <damm+renesas@xxxxxxxxxxxxx>
---
Changes since V4:
- Use leaf node mmu instead of root
Changes since V3:
- None
Changes since V2:
- None
Changes since V1:
- Updated the commit message
- Reworked patch to coexist with the multi context feature
drivers/iommu/ipmmu-vmsa.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
--- 0018/drivers/iommu/ipmmu-vmsa.c
+++ work/drivers/iommu/ipmmu-vmsa.c 2017-10-16 20:20:30.860607110 +0900
@@ -39,6 +39,7 @@ struct ipmmu_features {
bool use_ns_alias_offset;
bool has_cache_leaf_nodes;
unsigned int number_of_contexts;
+ bool setup_imbuscr;
};
struct ipmmu_vmsa_device {
@@ -457,9 +458,10 @@ static int ipmmu_domain_init_context(str
domain->cfg.arm_lpae_s1_cfg.mair[0]);
/* IMBUSCR */
- ipmmu_ctx_write_root(domain, IMBUSCR,
- ipmmu_ctx_read_root(domain, IMBUSCR) &
- ~(IMBUSCR_DVM | IMBUSCR_BUSSEL_MASK));
+ if (domain->mmu->features->setup_imbuscr)
+ ipmmu_ctx_write_root(domain, IMBUSCR,
+ ipmmu_ctx_read_root(domain, IMBUSCR) &
+ ~(IMBUSCR_DVM | IMBUSCR_BUSSEL_MASK));
/*
* IMSTR
@@ -979,6 +981,7 @@ static const struct ipmmu_features ipmmu
.use_ns_alias_offset = true,
.has_cache_leaf_nodes = false,
.number_of_contexts = 1, /* software only tested with one context */
+ .setup_imbuscr = true,
};
static const struct of_device_id ipmmu_of_ids[] = {
