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ipq40xx: fix pcie msi IRQ trigger level

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From: Niklas Cassel <niklas.cassel@linaro.org>
|The databook clearly states that the MSI IRQ (msi_ctrl_int) is a level
|triggered interrupt.
|
|The msi_ctrl_int will be high for as long as any MSI status bit is set,
|thus the IRQ type should be set to IRQ_TYPE_LEVEL_HIGH, causing the
|IRQ handler to keep getting called, as long as any MSI status bit is set.
|[...]
|Not having the correct IRQ type defined will cause us to lose interrupts,
|which in turn causes timeouts in the PCIe endpoint drivers.
|
|Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
|Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
This commit is contained in:
Christian Lamparter
2019-02-26 16:22:27 +01:00
parent 46b949a067
commit 18e942b6c4
2 changed files with 64 additions and 0 deletions
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32
target/linux/ipq40xx/patches-4.14/087-ARM-dts-qcom-ipq4019-Fix-MSI-IRQ-type.patch Normal file
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@@ -0,0 +1,32 @@
From: Niklas Cassel <niklas.cassel@linaro.org>
Subject: [PATCH] ARM: dts: qcom: ipq4019: Fix MSI IRQ type
Date: Thu, 24 Jan 2019 14:00:47 +0100
The databook clearly states that the MSI IRQ (msi_ctrl_int) is a level
triggered interrupt.
The msi_ctrl_int will be high for as long as any MSI status bit is set,
thus the IRQ type should be set to IRQ_TYPE_LEVEL_HIGH, causing the
IRQ handler to keep getting called, as long as any MSI status bit is set.
A git grep shows that ipq4019 is the only SoC using snps,dw-pcie that has
configured this IRQ incorrectly.
Not having the correct IRQ type defined will cause us to lose interrupts,
which in turn causes timeouts in the PCIe endpoint drivers.
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
--- a/arch/arm/boot/dts/qcom-ipq4019.dtsi
+++ b/arch/arm/boot/dts/qcom-ipq4019.dtsi
@@ -400,7 +400,7 @@
ranges = <0x81000000 0 0x40200000 0x40200000 0 0x00100000>,
<0x82000000 0 0x40300000 0x40300000 0 0x00d00000>;
- interrupts = <GIC_SPI 141 IRQ_TYPE_EDGE_RISING>;
+ interrupts = <GIC_SPI 141 IRQ_TYPE_LEVEL_HIGH>;
interrupt-names = "msi";
#interrupt-cells = <1>;
interrupt-map-mask = <0 0 0 0x7>;

32
target/linux/ipq40xx/patches-4.19/084-ARM-dts-qcom-ipq4019-Fix-MSI-IRQ-type.patch Normal file
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@@ -0,0 +1,32 @@
From: Niklas Cassel <niklas.cassel@linaro.org>
Subject: [PATCH] ARM: dts: qcom: ipq4019: Fix MSI IRQ type
Date: Thu, 24 Jan 2019 14:00:47 +0100
The databook clearly states that the MSI IRQ (msi_ctrl_int) is a level
triggered interrupt.
The msi_ctrl_int will be high for as long as any MSI status bit is set,
thus the IRQ type should be set to IRQ_TYPE_LEVEL_HIGH, causing the
IRQ handler to keep getting called, as long as any MSI status bit is set.
A git grep shows that ipq4019 is the only SoC using snps,dw-pcie that has
configured this IRQ incorrectly.
Not having the correct IRQ type defined will cause us to lose interrupts,
which in turn causes timeouts in the PCIe endpoint drivers.
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
--- a/arch/arm/boot/dts/qcom-ipq4019.dtsi
+++ b/arch/arm/boot/dts/qcom-ipq4019.dtsi
@@ -404,7 +404,7 @@
ranges = <0x81000000 0 0x40200000 0x40200000 0 0x00100000>,
<0x82000000 0 0x40300000 0x40300000 0 0x00d00000>;
- interrupts = <GIC_SPI 141 IRQ_TYPE_EDGE_RISING>;
+ interrupts = <GIC_SPI 141 IRQ_TYPE_LEVEL_HIGH>;
interrupt-names = "msi";
#interrupt-cells = <1>;
interrupt-map-mask = <0 0 0 0x7>;