From: Sekhar Nori <nsekhar@ti.com>
Date: Sun, 2 Aug 2020 16:53:56 +0000 (+0530)
Subject: arm64: dts: ti: k3-am65: restrict PCIe to Gen2 speed
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=269a5641b1ed0ac00e9d75b43985407b34540d77;p=linux.git

arm64: dts: ti: k3-am65: restrict PCIe to Gen2 speed

Per errata i2104 documented in AM65x device errata document (TI document
number SPRZ452E, revised June 2019), Gen3 operation is not supported for
both PCIe Root Complex and Endpoint modes of operation.

See: https://www.ti.com/lit/er/sprz452e/sprz452e.pdf

Restrict speed to Gen2 to address the errata.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20200802165356.10285-1-nsekhar@ti.com
---

diff --git a/arch/arm64/boot/dts/ti/k3-am65-main.dtsi b/arch/arm64/boot/dts/ti/k3-am65-main.dtsi
index e12759ce79187..76e0edc4ad5c6 100644
--- a/arch/arm64/boot/dts/ti/k3-am65-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am65-main.dtsi
@@ -704,7 +704,7 @@
 		ti,syscon-pcie-mode = <&pcie0_mode>;
 		bus-range = <0x0 0xff>;
 		num-viewport = <16>;
-		max-link-speed = <3>;
+		max-link-speed = <2>;
 		dma-coherent;
 		interrupts = <GIC_SPI 340 IRQ_TYPE_EDGE_RISING>;
 		msi-map = <0x0 &gic_its 0x0 0x10000>;
@@ -718,7 +718,7 @@
 		ti,syscon-pcie-mode = <&pcie0_mode>;
 		num-ib-windows = <16>;
 		num-ob-windows = <16>;
-		max-link-speed = <3>;
+		max-link-speed = <2>;
 		dma-coherent;
 		interrupts = <GIC_SPI 340 IRQ_TYPE_EDGE_RISING>;
 	};
@@ -736,7 +736,7 @@
 		ti,syscon-pcie-mode = <&pcie1_mode>;
 		bus-range = <0x0 0xff>;
 		num-viewport = <16>;
-		max-link-speed = <3>;
+		max-link-speed = <2>;
 		dma-coherent;
 		interrupts = <GIC_SPI 355 IRQ_TYPE_EDGE_RISING>;
 		msi-map = <0x0 &gic_its 0x10000 0x10000>;
@@ -750,7 +750,7 @@
 		ti,syscon-pcie-mode = <&pcie1_mode>;
 		num-ib-windows = <16>;
 		num-ob-windows = <16>;
-		max-link-speed = <3>;
+		max-link-speed = <2>;
 		dma-coherent;
 		interrupts = <GIC_SPI 355 IRQ_TYPE_EDGE_RISING>;
 	};