diff mbox series

[5.10,596/717] arm64: dts: marvell: keep SMMU disabled by default for Armada 7040 and 8040

Message ID 20201228125049.467143019@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman Dec. 28, 2020, 12:49 p.m. UTC 
From: Tomasz Nowicki <tn@semihalf.com>

commit f43cadef2df260101497a6aace05e24201f00202 upstream.

FW has to configure devices' StreamIDs so that SMMU is able to lookup
context and do proper translation later on. For Armada 7040 & 8040 and
publicly available FW, most of the devices are configured properly,
but some like ap_sdhci0, PCIe, NIC still remain unassigned which
results in SMMU faults about unmatched StreamID (assuming
ARM_SMMU_DISABLE_BYPASS_BY_DEFAUL=y).

Since there is dependency on custom FW let SMMU be disabled by default.
People who still willing to use SMMU need to enable manually and
use ARM_SMMU_DISABLE_BYPASS_BY_DEFAUL=n (or via kernel command line)
with extra caution.

Fixes: 83a3545d9c37 ("arm64: dts: marvell: add SMMU support")
Cc: <stable@vger.kernel.org> # 5.9+
Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm64/boot/dts/marvell/armada-7040.dtsi |    4 ----
 arch/arm64/boot/dts/marvell/armada-8040.dtsi |    4 ----
 2 files changed, 8 deletions(-)
diff mbox series

Patch

--- a/arch/arm64/boot/dts/marvell/armada-7040.dtsi
+++ b/arch/arm64/boot/dts/marvell/armada-7040.dtsi
@@ -15,10 +15,6 @@ 
 		     "marvell,armada-ap806";
 };
 
-&smmu {
-	status = "okay";
-};
-
 &cp0_pcie0 {
 	iommu-map =
 		<0x0   &smmu 0x480 0x20>,
--- a/arch/arm64/boot/dts/marvell/armada-8040.dtsi
+++ b/arch/arm64/boot/dts/marvell/armada-8040.dtsi
@@ -15,10 +15,6 @@ 
 		     "marvell,armada-ap806";
 };
 
-&smmu {
-	status = "okay";
-};
-
 &cp0_pcie0 {
 	iommu-map =
 		<0x0   &smmu 0x480 0x20>,