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Date:	Fri, 18 Mar 2016 01:30:23 +0900
From:	Magnus Damm <magnus.damm@...il.com>
To:	iommu@...ts.linux-foundation.org
Cc:	laurent.pinchart+renesas@...asonboard.com, geert+renesas@...der.be,
	joro@...tes.org, linux-kernel@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org, horms+renesas@...ge.net.au,
	Magnus Damm <magnus.damm@...il.com>
Subject: [PATCH 08/10] iommu/ipmmu-vmsa: Make IMBUSCTR setup optional

From: Magnus Damm <damm+renesas@...nsource.se>

Allow certain DT compat strings to opt-out of setting up
IMBUSCR. The default case is unchanged.

Signed-off-by: Magnus Damm <damm+renesas@...nsource.se>
---

 drivers/iommu/ipmmu-vmsa.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

--- 0023/drivers/iommu/ipmmu-vmsa.c
+++ work/drivers/iommu/ipmmu-vmsa.c	2016-03-18 00:32:45.550513000 +0900
@@ -36,6 +36,7 @@
 struct ipmmu_features {
 	bool use_ns_alias_offset;
 	bool has_cache_leaf_nodes;
+	bool setup_imbuscr;
 };
 
 struct ipmmu_vmsa_device {
@@ -415,10 +416,10 @@ static int ipmmu_domain_init_context(str
 	ipmmu_ctx_write(domain, IMMAIR0, domain->cfg.arm_lpae_s1_cfg.mair[0]);
 
 	/* IMBUSCR */
-	ipmmu_ctx_write(domain, IMBUSCR,
-			ipmmu_ctx_read(domain, IMBUSCR) &
-			~(IMBUSCR_DVM | IMBUSCR_BUSSEL_MASK));
-
+	if (domain->root->features->setup_imbuscr)
+		ipmmu_ctx_write(domain, IMBUSCR,
+				ipmmu_ctx_read(domain, IMBUSCR) &
+				~(IMBUSCR_DVM | IMBUSCR_BUSSEL_MASK));
 	/*
 	 * IMSTR
 	 * Clear all interrupt flags.
@@ -992,6 +993,7 @@ static void ipmmu_device_reset(struct ip
 static const struct ipmmu_features ipmmu_features_default = {
 	.use_ns_alias_offset = true,
 	.has_cache_leaf_nodes = false,
+	.setup_imbuscr = true,
 };
 
 static const struct of_device_id ipmmu_of_ids[] = {

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