From: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
To: Heinrich Schuchardt <xypron.glpk@gmx.de>
Cc: Mark Rutland <mark.rutland@arm.com>, Andrew Lunn <andrew@lunn.ch>,
Jason Cooper <jason@lakedaemon.net>,
devicetree@vger.kernel.org,
Gregory Clement <gregory.clement@bootlin.com>,
Russell King <linux@armlinux.org.uk>,
linux-kernel@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
linux-arm-kernel@lists.infradead.org,
Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Subject: Re: [PATCH 1/1] arm64: dts: marvell: mcbin: enlarge PCI memory window
Date: Mon, 20 May 2019 17:54:10 +0200 [thread overview]
Message-ID: <20190520175410.4c941bfc@windsurf> (raw)
In-Reply-To: <20190517161123.9293-1-xypron.glpk@gmx.de>
Hello Heinrich,
On Fri, 17 May 2019 18:11:23 +0200
Heinrich Schuchardt <xypron.glpk@gmx.de> wrote:
> Running a graphics adapter on the MACCHIATObin fails due to an
> insufficently sized memory window.
>
> Enlarge the memory window for the PCIe slot to 512 MiB.
>
> With the patch I am able to use a GT710 graphics adapter with 1 GB onboard
> memory.
>
> These are the mapped memory areas that the graphics adapter is actually
> using:
>
> Region 0: Memory at cc000000 (32-bit, non-prefetchable) [size=16M]
> Region 1: Memory at c0000000 (64-bit, prefetchable) [size=128M]
> Region 3: Memory at c8000000 (64-bit, prefetchable) [size=32M]
> Region 5: I/O ports at 1000 [size=128]
> Expansion ROM at ca000000 [disabled] [size=512K]
>
> Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
> ---
> arch/arm64/boot/dts/marvell/armada-8040-mcbin.dtsi | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/marvell/armada-8040-mcbin.dtsi b/arch/arm64/boot/dts/marvell/armada-8040-mcbin.dtsi
> index 329f8ceeebea..205071b45a32 100644
> --- a/arch/arm64/boot/dts/marvell/armada-8040-mcbin.dtsi
> +++ b/arch/arm64/boot/dts/marvell/armada-8040-mcbin.dtsi
> @@ -184,6 +184,8 @@
> num-lanes = <4>;
> num-viewport = <8>;
> reset-gpios = <&cp0_gpio2 20 GPIO_ACTIVE_LOW>;
> + ranges = <0x81000000 0x0 0xf9010000 0x0 0xf9010000 0x0 0x10000
> + 0x82000000 0x0 0xc0000000 0x0 0xc0000000 0x0 0x20000000>;
While I understand the change, I find it is a bit of a "one-off"
solution, which will only work specifically for the MacchiatoBin. But
admittedly, there isn't really a good generic solution: depending on
the number of PCIe ports and what you connect to them, you will need
windows of different sizes.
On older Armada platforms, it works a bit better because we have a
single PCIe MEM aperture and a single PCIe I/O aperture, from which all
PCIe ports allocate: each PCIe interface is a child bus of an emulated
root port.
Unfortunately, on Armada 7K/8K, each PCIe interface is seen as an
independent root complex, so we have one PCIe I/O aperture and one PCIe
MEM aperture for each.
Thomas
--
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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prev parent reply other threads:[~2019-05-20 15:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-17 16:11 [PATCH 1/1] arm64: dts: marvell: mcbin: enlarge PCI memory window Heinrich Schuchardt
2019-05-17 20:08 ` Gregory CLEMENT
2019-05-17 20:55 ` Heinrich Schuchardt
2019-05-17 21:26 ` Gregory CLEMENT
2019-05-20 15:54 ` Thomas Petazzoni [this message]
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