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Groups > linux.kernel > #1360009

[PATCH 08/10] iommu/ipmmu-vmsa: Make IMBUSCTR setup optional

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From: Magnus Damm <damm+renesas@opensource.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@opensource.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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[PATCH 00/10] iommu/ipmmu-vmsa: Initial r8a7795 support Magnus Damm <magnus.damm@gmail.com> - 2016-03-17 17:30 +0100
  [PATCH 09/10] iommu/ipmmu-vmsa: Allow two bit SL0 Magnus Damm <magnus.damm@gmail.com> - 2016-03-17 17:30 +0100
  [PATCH 06/10] iommu/ipmmu-vmsa: Add optional root device feature Magnus Damm <magnus.damm@gmail.com> - 2016-03-17 17:30 +0100
  [PATCH 05/10] iommu/ipmmu-vmsa: Introduce features, break out alias Magnus Damm <magnus.damm@gmail.com> - 2016-03-17 17:30 +0100
  [PATCH 10/10] iommu/ipmmu-vmsa: Hook up r8a7795 DT matching code Magnus Damm <magnus.damm@gmail.com> - 2016-03-17 17:30 +0100
  [PATCH 07/10] iommu/ipmmu-vmsa: Write IMCTR twice Magnus Damm <magnus.damm@gmail.com> - 2016-03-17 17:30 +0100
  [PATCH 01/10] iommu/ipmmu-vmsa: Make use of IOMMU_OF_DECLARE() Magnus Damm <magnus.damm@gmail.com> - 2016-03-17 17:30 +0100
  [PATCH 03/10] iommu/ipmmu-vmsa: Teach xlate() to skip disabled iommus Magnus Damm <magnus.damm@gmail.com> - 2016-03-17 17:30 +0100
    Re: [PATCH 03/10] iommu/ipmmu-vmsa: Teach xlate() to skip disabled iommus Geert Uytterhoeven <geert@linux-m68k.org> - 2016-03-18 10:50 +0100
  [PATCH 08/10] iommu/ipmmu-vmsa: Make IMBUSCTR setup optional Magnus Damm <magnus.damm@gmail.com> - 2016-03-17 17:30 +0100
  [PATCH 04/10] iommu/ipmmu-vmsa: IPMMU device is 64-bit bus master Magnus Damm <magnus.damm@gmail.com> - 2016-03-17 17:30 +0100
  [PATCH 02/10] iommu/ipmmu-vmsa: Enable multi context support Magnus Damm <magnus.damm@gmail.com> - 2016-03-17 17:30 +0100

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